Home

- Hartzell Engine Technologies

1. 8 5 Spark Plug Maintenance cont d C Inspection and Servicing Type III Spark Plug 1 Inspect the Type III spark plug if it fails to clean up properly and or if electrodes are badly eroded it should be replaced No re gapping of the Type III is possible Do not bend the center electrode or the disk on the at the center electrode D Installation Type 8 Type III Spark Plug NOTE NO RE GAPPING OF TYPE III SPARK PLUG IS POSSIBLE DO NOT BEND THE CENTER ELECTRODE OR THE DISK ON TOP OF THE CENTER ELECTRODE 1 Perform a gap spark test per Chapter 6 applicable test 2 After the spark plug gap is checked the spark plug and gasket may be installed and torqued 3 Place a new spark plug gasket on the threads If the gasket does not hold on the threads and would be likely to fall off during installation place a small drop of Aviation Permatex or similar material on the gasket to stick it temporarily to the plug shell Screw the spark plug into the heater with a deep socket Tighten to a torque of 28 ft Ibs 5 Install the grommet in the heater jacket opening Carefully insert the spring connector on the high voltage lead into the spark plug shell press down gently and start the nut on the threads Tighten the nut to 20 ft lbs 8 6 Vibrator Assembly Maintenance see Figure 8 3 if applicable to ignition unit 1 Remove the necessary access panels to reach the ignition unit on the heater assembly 2 Measure the distan
2. Insufficient fuel supply Ice or water in system fuel lines Spark plug partially fouled Loose primary connection at ignition assembly Faulty vibrator Combustion air blower speed fluctuates Can be caused by low voltage loose blower wheel worn brushes or motor High voltage leak in lead between ignition assembly and spark plug Inoperative ignition assembly Restriction in fuel nozzle orifice Nozzle loose in retainer or improper spray angle Energize the MASTER switch Check amp repair wiring See aircraft AFM or POH for operation Close circuit breaker Replace motor brushes Remove and check the ventilating air blower wheel and realign if necessary Remove blower assembly and replace motor Replace filter Inspect and replace faulty wiring Tighten ground screw Be sure any metal preservation has been removed for good ground connection Replace motor brushes Overhaul the combustion air blower Replace filter Remove combustion air motor for overhaul or replacement of motor Inspect fuel supply to heater including shutoff valve solenoid valve fuel filter fuel pump and fuel lines Make necessary repairs Replace spark plug CAUTION Do not create spark gap by holding lead to heater jacket This can result in damage to lead and ignition unit and operator may receive an electrical shock Tighten the connection Replace the vibrator Remove and overhaul the combustion air
3. 1 Discard all rubber parts such as grommets gaskets etc These items should always be replaced at overhaul Also discard the rope gasket 2 Inspect all wires and wiring harnesses for damage to insulation damaged terminals chaffed or cracked insulation Individual wires can be replaced by making up new wires from No 16 AWG stock and cut to correct length It is advisable to use an acceptable crimping tool for installing terminals rather than solder for all heater wiring connections If extensive wiring harness damage is visible the entire harness assembly should be replaced Individual damaged wires may be replaced but be sure that all cable ties and clamps are restored If heater controls were operating properly at the time of removal reinstall them 3 Inspect accessible hardware parts consisting of bolts screws nuts washers and lockwashers Replace broken or damaged parts as needed 4 Inspect the heater electrical terminal strip for distortion and cracks and replace it if either condition exists 5 Inspect all radio noise filters for short circuits by checking from either terminal to ground with an ohmmeter An open circuit reading should be obtained Radio noise filters may degrade over time if RFI is related to heater operation it is advisable to replace them 21 40 01 99M90 Page 8 12 Issued May 9 2012 Rev New l Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES a N MONTGOMER
4. Carefully install brush holder assembly Install brush and spring Solder brush lead and spring or install assembly Install secondary nuts and washers Install back shell Install nuts and washers Brushes must be run in the same manner as in 8 4 B step 5 SD 01 ONS 99M90 21 40 01 Page 8 9 Rev New Issued May 9 2012 l Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES ee 8 7 Ventilating Air Blower Maintenance cont d NOTE Due to the variation in motor application the motor installed in your particular installation may not have available or replaceable bearings In this case the motor must be replaced Check the IPC Chapter of the P N 99M91 Overhaul amp Maintenance manual H Brush Installation External brush 1 Install brush and spring assembly 2 Install brush screw cap 3 Brushes must be run in the same manner as in 8 4 B step 5 Bearing Removal motor removed from housing 1 If not already accomplished remove fan by loosening the allen screw Remove the nut and lockwasher Remove the thru bolt Remove the housing assembly Carefully remove brushes and holder assembly Remove armature very carefully taking care not to damage the commutator or stator Before replacing the bearings it is advisable to Inspect the components of the motor for condition check the stator wires insulation and check the armature with a growler for performance
5. Ground Electrode Outer Surface of the Spark Plug Cleaned with Isopropyl Alcohol FIGURE 4 1 Type Spark Plug 21 40 01 Page 4 3 Issued May 9 2012 l Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES gt ae 4 5 Spark Plug Cleaning cont d NOTE Previous heaters models that have been upgraded to I Series combustion heaters may have used Type II spark plugs These spark plugs do not have an anode so they will not function and the heater will not work Type spark plugs are used only in the l 1500 model heater Type Il spark plugs are used on on the remaining HET Series combustion heaters Type Ill Spark Plug If the spark plug appears to be in good condition the upper housing and the outer surface of the ground electrode sleeve may be wiped clean with a shop towel moistened with isopropyl alcohol the internal porcelain may be blown clean using shop air directed through the vent holes or through the open end No abrasive cleaning sand or bead blast permitted After cleaning the spark gap the spark plug may be checked as described in Chapter 6 Refer to Chapter 8 for additional maintenance details Spark Plug Three 3 Vent Holes Ground Electrode Outer Surface of the Spark Plug Center Cleaned with Electrode Isopropyl Alcohol FIGURE 4 2 Type Il Spark Plug Cleaning 21 40 01 99M90 Page 4 4 Issued May 9 2012 Rev New I Series Combustion Heater Owners Manu
6. gize the fuel solenoid valve Connect the high voltage lead temporarily and lay the spark plug on the heater jacket Energize heater system and check for spark between spark plug and ground electrode See Figure 2 8 Chapter 2 Testing Type III Spark Plug The gap between the center electrode disk and ground electrode should be between 0 105 0 015 inch See Figure 6 3 Prior to installation spark plugs can be checked visually for sparking across the gap prior to installing the plug as follows Disconnect the wire from the No 3 terminal on the heater wiring side of the terminal strip to de energize the fuel solenoid valve Connect the high voltage lead temporarily and lay the spark plug on the heater jacket energize heater system and observe spark between center electrode and ground electrode See Figure 2 8 Chapter 2 Spark Plug Three 3 Vent Holes Ground Electrode d Center 0 105 0 015 Electrode FIGURE 6 3 Type III Spark Plug Gap 6 5 Testing Miscellaneous and Optional Components Except for 6 5 A the miscellaneous and optional components should be tested as outlined in the Combustion Heater Overhaul amp Maintenance manual HET P N 99M91 Some items such as the fuel regulators fuel pumps ignition systems cycling over temperature and duct switches are replaced with new or may be tested only by utilizing the completed heater assembly Miscellaneous and optional components vary widely from aircraft to a
7. If armature fails this test or any discrepancies are noted it is more economical to replace the motor 7 Using a common bearing puller of the correct size remove the bearing mm ko J Bearing Installation 1 Inspect the bearing cavity for condition Ball bearings are press fit and should not easily fit If bearing easily slips into the cavity replace the motor assembly 2 Press the bearing using an arbor press and appropriately sized tool Brush Ass y Cap Screw amp gt e 3 Filter y Cover amp Air Inlet Assembly Fig 8 4 Typical Ventilating Air Blower Ass y non pressurized heater 21 40 01 99M90 Page 8 10 Issued May 9 2012 Rev New I Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES o Zeg MONTGOMERY ALABAMA USA 8 7 Ventilating Air Blower Maintenance cont d RFI Filter Internal Brush Assemblies 21 22 WE de SE E Motor Assembly Fig 8 5 Typical Ventilating Air Blower Ass y pressurized heater Cover amp Inlet Assembly 99M90 21 40 01 Page 8 11 Rev New Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual 8 8 Fuel Nozzle Maintenance No periodic maintenance is required on the fuel nozzle If it is suspect that the fuel nozzle is clogged or not spraying the proper pattern as may be found in Chapter 3 Troubleshooting it may be removed and cleaned or replaced in lieu of ov
8. or new Perform an initial check of the heater assembly Gain access to the heater and check the security of electrical connectors and connections at the terminal strip ignition leads and spark plug all inlet and outlet air connections and fuel line Check the exhaust tube for condition and interference with structure Check the drain line for obstructions 99M90 21 40 01 Page 5 1 Rev New Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual ir 5 3 Periodic Inspection Checks cont d Note It is recommended that a timing meter be used on the heater assembly to establish heater hours of operation If a timing meter is not used count one 1 heater hour for each two 2 flight hours for normal aircraft operation If the heating system is used excessively in ground operations the exact time of this operation must be used for inspection and overhaul purposes calculation does not apply 50 Hours time in service one time overhauled rebuilt or new Inspect the ventilating air inlet scoop combustion air inlet scoop exhaust outlet and fuel drain for possible obstructions and clear Check that no damage has occurred to air scoop protrusions Look in the area of the heater exhaust tube for a large or unusual accumulation of soot on the skin of the aircraft This indicates a rich burning condition and requires troubleshooting Perform operational check of the heater per para 5 2 100 Hours
9. 1 1 defines preventive maintenance as simple or minor preservation operations and the replacement of small standard parts not involving complex assembly operations Under FAR Part 43 Appendix A Paragraph C Preventive Maintenance there are no specific allowances for preventive maintenance to be performed on combustion heaters All maintenance including preventative maintenance must be performed by licensed mechanics A amp P A IA or international equivalents or qualified repairman For more detailed reference see the latest revision of FAA AC 43 12a Because of the numerous modifications Supplemental Type Certificates STC Parts Manufacturing Approvals PMA Form 337 Field Approvals it is the responsibility of the repairman mechanic or maintenance facility to determine proper heater to aircraft rotorcraft application of the l Series heater assemblies All I Series heaters are TSO C20 A 1 approved Please refer to the appropriate aircraft Type Certificate TC Supplemental Type Certificate STC aircraft equipment list maintenance manuals and or Log Book entries for determination When performing installation maintenance replacement adjustment inspection or overhaul of any HET assembly component or part it is imperative that the latest revision of the appropriate HET manual or product support document be referenced Reference the Hartzell Engine Technologies LLC website to be sure you have the latest revision before perform
10. A 2 Issued May 9 2012 INTENTIONALLY LEFT BLANK l Series Combustion Heater Owners Manual 99M90 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES Zeg ee Chapter 1 INTRODUCTION 1 0 General Information WARNING IMPROPER OR UNAUTHORIZED APPLICATIONS OF THE INFORMATION CONTAINED IN THE MANUAL MAY RENDER THE AIRCRAFT ROTORCRAFT OR THE COMPONENT UNAIRWORTHY AND RESULT IN LOSSES DAMAGES OR INJURY TO THE USER DO NOT USE OBSOLETE OR OUTDATED INFORMATION PERFORM BASIC MAINTENANCE AND INSPECTION PER THIS MANUAL OR OVERHAUL ACTIVITY IN ACCORDANCE WITH THE MOST RECENT REVISION OF HET P N 99M91 OVERHAUL MANUAL INFORMATION CONTAINED IN EITHER MANUAL MAY BE SIGNIFICANTLY CHANGED FROM EARLIER REVISIONS USE OF OBSOLETE INFORMATION MAY CREATE AN UNSAFE CONDITION THAT MAY RESULT IN DEATH SERIOUS BODILY INJURY AND OR SUBSTANTIAL PROPERTY DAMAGE REFER TO THE HET WEBSITE FOR THE MOST RECENT REVISION LEVEL This owners manual has been approved by Hartzell Engine Technologies LLC to provide the proper methods and procedures that A P Mechanics FAA approved repairmen and or other approved facilities should use for incidental maintenance of Hartzell Engine Technologies LLC I Series heaters as may be indicated by the owner The owner operator pilot with a minimum of a private license of an aircraft or rotorcraft is permitted by FAR 43 to perform certain preventative maintenance tasks FAR Part 1 Section
11. Basic Model Numbers Inconel Troubleshooting Heater HARTZELL ENGINE TECHNOLOGIES EE Ee PAGE 1 3 3 3 21 40 01 Page xvii Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual SE Ee INTENTIONALLY LEFT BLANK 21 40 01 99M90 Page xviii Issued May 9 2012 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES AIRWORTHINESS LIMITATIONS A0 General Information CAUTION THE AIRWORTHINESS LIMITATIONS HEREIN ARE THOSE MANDATED BY HARTZELL ENGINE TECHNOLOGIES LLC THESE LIMITATIONS ARE THE MINIMUM REQUIRED TO MEET CONTINUED AIRWORTHINESS BUT MAY BE SUPERCEDED BY MORE STRINGENT REQUIREMENTS AS PUBLISHED BY THE FAA AIRCRAFT ROTORCRAFT OR OTHER MANUFACTURERS THAT USE THESE COMPONENTS IN THEIR APPLICATIONS FAILURE TO OBSERVE THESE LIMITATIONS MAY COMPROMISE THE COMPONENT OR THE APPLICATION IT IS USED IN AND MAY RESULT IN DEATH SERIOUS BODILY INJURY AND OR SUBSTANTIAL PROPERTY DAMAGE imitations L GU 0 10 d ES ES e gt lt A 1 Airworthiness Limitation Statement 1 0 The Airworthiness Limitations Chapter is FAA accepted and specifies maintenance required under Secs 43 16 and 91 403 of the Federal Aviation Regulations unless an alternative program has been FAA approved 2 0 Not Applicable 99M90 21 40 01 Page A 1 Rev New Issued May 9 2012 HARTZELL ENGINE TECHNOLOGIES Se Ee 21 40 01 Page
12. COIL ASSEMBLY SPARK PLUG OR VIBRATOR AND MAY SHORTEN THE USEFUL LIFE OF THESE ITEMS DO NOT TOUCH THE SPARK PLUG WHILE ENERGIZED IT HAS DANGEROUSLY HIGH VOLTAGE AND MAY CAUSE INJURY OR EVEN DEATH MAKE SURE TO PLUG THE SPARK PLUG HOLE IN THE HEATER TO PREVENT ANY POSSIBILITY OF RESIDUAL FUEL BLOWING OUT AND IGNITING Three types of spark plugs are used on HET Combustion Heaters Series heater models use Type III Spark Plug exclusively except for the I 1500 which uses a Type spark plug The data shown for the Type II Spark Plug below is for identification purposes on I Series heaters which have been upgraded I Series upgraded heaters l 2500 I 3500 and l 5000 do not use Type I or Type II spark plugs if found installed the heater may not be an I Series model Type Spark Plug has a center electrode and an attached ground electrode bail and is used in the I Series model l 1500 only see Fig 6 1 Type Il Spark Plug see Figure 6 2 has a center electrode but no attached ground electrode The ground electrode is attached to the combustion head of the heater Type Ill Spark Plug is shown in Figure 6 3 This spark plug contains a center electrode This spark plug is used mostly on B Series high altitude kerosene burning heaters and all I Series heaters 99M90 21 40 01 Page 6 3 Rev New Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual 6 4 Testing Spark Plug cont d CAUTION NE
13. RESIDUAL FUEL BLOWING OUT AND IGNITING CAUTION NEVER INSTALL A TYPE Il SPARK PLUG INTO AN I SERIES HEATER SEVERE DAMAGE TO THE HEATER AND HEATER IGNITION UNIT WILL OCCUR AND PHYSICAL INJURY MAY RESULT A Removal Type amp Type Ill Spark Plug dk 2 Remove the necessary access panels to expose the spark plug area of the heater Unscrew and remove the high voltage lead connector at the spark plug Exercise care to avoid fouling or damaging the connector Remove the grommet Using a 7 8 inch deep hex socket unscrew and remove the spark plug Make sure the spark plug gasket is removed with the spark plug It will normally stick on the spark plug threads but if loose it might drop into the ventilating air passages of the heater Should this happen remove the gasket with a wire hook B Inspection and Servicing Type Spark Plug 1 If the spark plug appears to be in good condition except for a mild coating of oxide on the porcelain and electrodes it may be cleaned and reused Refer to Chapter 4 cleaning information If the electrodes are not eroded or damaged re gap the spark plug by carefully bending the ground electrode until a 0 055 inch feeler gage can be inserted between between the end of the center electrode and the ground electrode See Chapter 6 99M90 Issued May 9 2012 Rev New l Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES a N MONTGOMERY ALABAMA USA
14. blower assembly as required or correct low voltage condition Replace ignition assembly If vibrator is in good condition replace ignition assembly only Remove nozzle for cleaning or replacement See 99M91 Overhaul amp Maintenance manual Testing chapter Tighten or replace the nozzle as required 99M90 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES Ge 3 2 Troubleshooting cont d TABLE 3 1 Troubleshooting cont d TROUBLE PROBABLE CAUSE REMEDY Heater starts then Lack of fuel at heater Check fuel supply through all components from goes out the tank to the heater Make the necessary corrections See AFM or POH for operation or aircraft service manual Inoperative or chattering com Check adjust or replace switch bustion air pressure switch Inoperative overheat switch Check or replace switch Inoperative cycling switch Adjust or replace the switch Low voltage Attach external power See aircraft service manual Heater fails to Fuel solenoid valve in heater Remove and replace solenoid assembly shut off stuck open See 99M91 Overhaul amp Maintenance manual Inoperative duct and cycling Check and repair switch Defective MASTER switch Replace the master switch See aircraft service manual 99M90 21 40 01 Page 3 5 Rev New Issued May 9 2012 HARTZELL I Series Combustion Heater EE Owners Manual Intentionally Left Blank 21 40 0
15. combustion heater under TSO C20 A 1 is controlled by the applicable design holder TC STC etc F Service Bulletins Service Information Letters and other important publications may be critical to continued safe operation of the heater and should always be referenced along with this manual Be advised that some service publications do not have a closing action but are re occurring and will require continued action as required by HET the FAA or other civil aviation authorities 1 1 About the manual A This Owners Manual is provided with each new or rebuilt I Series combustion heater manufactured or rebuilt by HET and is not specific for any I Series heater model This manual does not contain part numbers or overhaul data For these activities consult the I Series Overhaul Manual with IPC part number 99M91 B This Owners Manual is divided into 8 parts Each part is designed to offer information to a specific area to educate or provide supplement instruction whenever operation or maintenance of the combustion heater is anticipated or desired C This Owners Manual does not replace or supercede any document or publication issued by a specific design holder as may be certified under a type certificate supplemental type certificate or other restricted categories This includes domestic and foreign aircraft rotorcraft or other manufacturers D When using this manual for operation or maintenance always refer to the most current aircraft r
16. cont d Air Blower This blower is attached to the inlet end of the heater assembly and provides a source of ventilating air through the heater Ram air from the ventilating air intake scoop is normally used during flight The blower can run continuously unless some provision is made to shut it off during flight and use ram air exclusively The power line should be the circuit interrupted by a switch not the line from blower to ground See Figure 2 5 FIGURE 2 5 Typical Vent Air Blower Assembly Combustion Air Blower See Figure 2 6 amp 2 7 This centrifugal type blower is normally mounted separately from the heater to permit more flexibility for installation lt supplies combustion air to the combustion chamber of the heater typically from outside air See Figure 2 7 Performance of the combustion air blower is assisted by the use of ram air during flight The type of blower and mounting location are typically controlled by the aircraft rotorcraft design holder FIGURE 2 6 The Combustion Air Blower Ass y Figure 2 7 CA Blower Air Inlet Typical 99M90 21 40 01 Page 2 5 Rev New Issued May 9 2012 _ OPERATION 2 2 Operating Description HARTZELL ENGINE TECHNOLOGIES Operating Controls The typical basic schematic diagram Figure 2 8 shows in addition to the heater circuit an aircraft rotorcraft supplied control circuit For the purpose of this manual this circuit will be used to describe heater oper
17. decay test not using below tester or Pressure Decay Tester P N PDT 285B or P N PDT 286B The above special tools may be purchased from Hartzell Engine Technologies LLC Phone 334 386 5400 2900 Selma Highway Fax 334 386 5410 Montgomery AL 36108 USA Website http www hartzellenginetech com NOTE The HET P N PDT 285B and P N PDT 286B contain the Test Box Instruction Manual 94E48 fuel pressure gauge various lines and fittings as well as a selection of expansion bulbs They are intended for use in shops specializing in aircraft combustion heater inspection overhaul and repair The primary difference between the two kits is the PDT 286B has thermal reading capabilities and the air lines have quick connecting fittings 21 40 01 99M90 Page 7 2 Issued May 9 2012 Rev New l Series Combustion Heater Owners Manual HARTZELL SuSE TESORO A MONTGOMERY ALABAMA USA Chapter 8 GENERAL MAINTENANCE 8 0 General 99M90 Rev New WARNING THERE ARE NO OWNER OPERATOR MAINTENANCE ACTIVITIES PERMITTED ON HET COMBUSTION HEATERS THE FOLLOWING MAINTENANCE PROCEDURES MUST BE ACCOMPLISHED BY A QUALIFIED LICENSED MECHANIC OR REPAIRMAN FAMILIAR WITH AIRCRAFT HEATING SYSTEMS FAILURE TO OBSERVE THIS CAUTION MAY COMPROMISE THE COMPONENT OR THE APPLICATION IT IS USED IN IMPROPER MAINTENANCE MAY RESULT IN DEATH SERIOUS BODILY INJURY AND OR SUBSTANTIAL PROPERTY DAMAGE This chapter provides information
18. each 60 months the first to occur The 500 Hour Inspection coincides with the requirements of the 100 hour inspection 1 If installed disconnect the external fuel shutoff valve apply fuel pressure and check that the valve shuts off fuel completely Internal fuel shutoff check for fuel pressure drop with solenoid shutoff and accompanying fuel drip from heater drain Power on to flow fuel These components are replacement items only 2 If installed disconnect the fuel regulator and shutoff valve apply fuel pressure and check that the valve shuts off fuel completely Check regulation pressures per Chapter 9 of the P N 99M91 Overhaul amp Maintenance manual If checked note that no local overhaul or repair on these components are permitted Some units may be returned to HET for overhaul or exchange t should be noted that these regulators contain age controlled components that are subject to the requirements of MIL STD 1523 2000 Hours time in service or if the pressure decay test fails first to occur 1 Overhaul or replace heater assembly Upon the accumulation of 12 calendar years from new rebuilt or from any overhaul the combustion heater must be overhauled regardless of hours time in service 99M90 21 40 01 Page 5 3 Rev New Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual 5 4 Bi Annual Maintenance Checks The heating system should be inspected at regular intervals th
19. is especially true of Jet fuels as inactivity may allow the growth of biologicals in the line clogging them entirely Some aircraft rotorcraft incorporate pre filters and scuppers which are also source of biological growths Check the aircraft air inlet system Heater air inlets also vary greatly from airframe to airframe Most inlets incorporate a scoop of some sort flush or extended to allow air into the heater and to provide a source of additional ram air for altitude operations In addition many have a method to avoid icing over the inlet and may as well have an air shutoff system Check all the connections from the inlet source to the heater for air leaks restrictions or debris Check the aircraft air supply to cabin Conditioned or heated air can be lost on it s way to the cabin through leaks Check all connections ducts and tubes Check for debris in the ducts Check the Combustion Heater exhaust Heater exhaust is important in that a restricted exhaust will not allow proper combustion to occur or will stop it all together Exhaust restriction may not be apparent as a restriction may form due to the positioning of the exhaust pipe or scarf in the wind stream The aircraft or rotorcraft service or maintenance manual will indicate proper placement of the heater exhaust system and overboard requirements 3 2 Troubleshooting WARNING 1 THERE ARE NO OWNER OPERATOR MAINTENANCE ACTIVITIES PERMITTED ON HET COMBUSTION HEATERS THE FOLLOWI
20. may be listed in SPECIAL TOOLS EQUIPMENT AND FIXTURES Heater Pressure Decay Test kit 26E24 1 or Pressure Decay Tester P N PDT 285B or P N PDT 286B 4 Instruments A multimeter Simpson 260 or Triplett 630 or equivalent accuracy 1 An ammeter min 250 amp rating Zero to 30 volt power supply Optical or Mechanical tachometer 5 Test conditions A 5 Ambient temperature 70 to 80 F 21to27 OC 99M90 21 40 01 Page 6 1 Rev New Issued May 9 2012 l Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES A TES _ MONTGOMERY ALABAMA USA 6 1 Testing cont d B Precautions WARNING WHETHER THE HEATER IS INSTALLED OR REMOVED MAKE SURE THAT THE AREA IN AND AROUND THE AIRCRAFT ROTORCRAFT OR SHOP IS SECURE AND THE TESTING AREA IS WELL VENTILATED MAKE SURE THAT ALL STAFF AND PERSONNEL ARE WARNED THAT TESTING IS PROGRESS CARBON MONOXIDE FROM THE HEATER EXHAUST AS WELL AS THE POTENTIAL OF UNCONTAINED FIRE MAY CAUSE INJURY OR DEATH FAILURE TO OBSERVE THIS WARNING MAY COMPROMISE THE COMPONENT OR THE APPLICATION IT IS USED IN IMPROPER TESTING MAY RESULT IN DEATH SERIOUS BODILY INJURY AND OR SUBSTANTIAL PROPERTY DAMAGE It is imperative that regular maintenance be accomplished per this manual or the HET P N 99M91 Overhaul 8 Maintenance manual and per the requirements of the applicable aircraft rotorcraft service manuals and publications Tests must be done by qualified and co
21. time in service and each 100 hours thereafter at annual inspection or each 12 months the first of these to occur Inspection shall be conducted on all I Series heaters including new rebuilt upgraded or overhauled The 100 Hour Inspection consists of the items listed below Refer to maintenance Chapter 8 of this manual the applicable chapter of HET P N 99M91 Overhaul amp Maintenance manual or the applicable aircraft rotorcraft service manuals for appropriate details 1 Inspect ventilating and combustion air inlets and exhaust outlet for restrictions and security at the aircraft skin line Check any external scoop and make sure they are not distorted and are securely attached to the aircraft 2 Inspect the drain line to make sure it is free of obstructions Run a wire of the appropriate length through it if necessary to clear any obstruction 3 Check all fuel lines for security at joints and shrouds making sure that no evidence of leaks exists Also check for security of attachment of fuel lines at the various attaching points in the aircraft Check any fuel filter or scupper if incorporated 4 Inspect electrical wiring at the heater terminal block and components for loose connections possible chaffing of insulation and security of attachment points 5 Inspect the high voltage cable connection at the spark plug to make sure it is right Also examine the cable sheath for any possible indications of arcing 6 Inspect the co
22. which converts 12 volts or 24 volts to high voltage oscillating current to provide a continuous spark across the spark gap A shielded high voltage lead connects the ignition assembly to the spark plug Combustion air enters the combustion chamber tangent to its surface and imparts a whirling or spinning action to the air This produces a whirling flame that is stable and sustains combustion under the most adverse conditions because it is whirled around itself many times Therefore ignition is continuous and the combustion process is self piloting The burning gases travel the length of the combustion tube flow around the outside of the inner tube pass through cross over passages into an outer radiating area then travel the length of this surface and out the exhaust See Figure 2 2 Ventilating air passes through the heater between the jacket and combustion tube assembly outer surface and through an inner passage in the assembly Consequently ventilating air comes into contact with two or more heated cylindrical surfaces s HIGH VELOCITY WHIRLING FLAME N PR d COMBUSTION AIR INLET gt J Di FUEL INLET HEATED AIR O e A Ie SOLENOID VALVE Imes EXHAUST GASES 7 a FRESH AIR Fig 2 2 A FROM BLOWER Whirling Flame Depiction 21 40 01 99M90 Page 2 2 Issued May 9 2012 Rev New l Series Combustion Heater Owners Manual HARTZELL ene MONTGOMERY ALABAMA USA DESCRIPTION 2 1 Component O
23. 1 99M90 Page 3 6 Issued May 9 2012 Rev New l Series Combustion Heater Owners Manual 4 0 4 1 General HARTZELL ENGINE TECHNOLOGIES EE ns MONTGOMERY ALABAMA USA Chapter 4 CLEANING This chapter indicates the proper cleaning methods and materials for cleaning the heater for maintenance or repair Except for cosmetic cleaning of the heater exhaust pipe on the exterior of the aircraft rotorcraft all cleaning activities must be performed by an appropriately licensed or approved mechanic WARNING 1 THERE ARE NO OWNER OPERATOR MAINTENANCE ACTIVITIES PERMITTED ON HET COMBUSTION HEATERS THE FOLLOWING CLEANING PROCEDURES MUST BE ACCOMPLISHED BY A QUALIFIED LICENSED MECHANIC OR REPAIRMAN FAMILIAR WITH AIRCRAFT HEATING SYSTEMS FAILURE TO OBSERVE THIS WARNING MAY COMPROMISE THE COMPONENT OR THE APPLICATION IT IS USED IN IMPROPER CLEANING MAY RESULT IN DEATH SERIOUS BODILY INJURY AND OR SUBSTANTIAL PROPERTY DAMAGE WARNING 2 PROLONGED EXPOSURE TO VOLATILE CLEANING AGENTS IS HAZARDOUS TO YOUR HEALTH USE DEGREASERS AND SOLVENTS IN WELL VENTILATED AREAS USE APPROPRIATE EYE PROTECTION GLOVES AND COTTON APRONS REVIEW ALL SAFETY INFORMATION FOR THE CHEMICAL BEING USED PRIOR TO USING IT CAUTION AGGRESSIVE USE OF CHEMICAL DEGREASERS CLEANING SOLVENTS OR MECHANICAL CLEANING PROCESSES MAY RESULT IN NON REPAIRABLE DAMAGE TO COMPONENTS AND PARTS OF THE HEATER DO NOT LEAVE HEATER PARTS OR COMPONENTS UNATTENDE
24. 2 Operating Description TROUBLESHOOTING CLEANING CHECK 99M90 Rev New 3 0 General 3 1 Procedure Prior to Repair 3 2 Troubleshooting 4 0 General 4 1 Required Safety Equipment 4 2 Recommended Materials 4 3 Exterior Cleaning 4 4 General Component Cleaning 4 5 Spark Plug Cleaning 5 0 General 5 1 Preflight or Daily Inspection Checks 5 2 Operational Checks 5 3 Periodic Inspection Checks 5 4 Bi Annual Maintenance Checks HARTZELL ENGINE TECHNOLOGIES a vii xi xiii XV xviii gt gt EE ek a E 1 NOOTWWND Np MI 2 6 3 1 3 1 3 2 21 40 01 Page iii Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual Table of Contents cont d TESTING 6 0 General 6 1 6 1 Testing 6 1 6 2 Pressure Decay Test 6 2 6 3 Testing Combustion Air Blower After Brush Change 6 3 6 4 Testing Spark Plug 6 3 6 5 Testing Miscellaneous and Optional Components 6 5 SPECIAL TOOLS 7 0 General 7 1 7 1 Required Safety Equipment 7 1 7 2 Material Required 7 1 7 3 Special Tool Specification TA GENERAL MAINTENANCE 8 0 General 8 1 8 1 Bi Annual Maintenance 8 2 8 2 Periodic Maintenance 8 2 8 3 Overhaul amp Maintenance Manual 8 2 8 4 Combustion Air Blower Maintenance 8 3 8 5 Spark Plug Maintenance 8 6 8 6 Vibrator Assembly Maintenance 8 7 8 7 Ventilating Air Blower Maintenance 8 8 8 8 Fuel Nozzle M
25. D WHILE IMMERSED OR SOAKING IN SOLVENTS DO NOT ATTEMPT TO CLEAN THE HEATER ELECTRICAL PARTS BY IMMERSION OR SOAKING Required Safety Equipment Safety gloves Protective goggles or splash shield Protective apron Eye wash station 4 2 Recommended Materials 99M90 Rev New Aviation Quality solvents Aviation Quality electrical contact cleaner Isopropyl alcohol Shop cloths Non metallic bristle brush Crocus Cloth Oil free dry air source 21 40 01 Page 4 1 Issued May 9 2012 l Series Combustion Heater Owners Manual HARTZELL nee LA MONTGOMERY ALABAMA USA NOTE Prior to cleaning the heater whether mounted on the aircraft or as removed observe and note condition Look for any signs of hot air or exhaust leaks electrical arcing from wiring or ignition and cracks or tears in the heater jacket or other heater parts 4 3 Exterior Cleaning CAUTION DISCONNECT ALL ELECTRICAL POWER OR OTHER SOURCE OF IGNITION AS CLEANING AGENTS MAY BE FLAMMABLE FAILURE TO OBSERVE THIS CAUTION MAY LEAD TO AN UNCONTAINED FIRE WHICH MAY RESULT IN DEATH SERIOUS BODILY INJURY AND OR SUBSTANTIAL PROPERTY DAMAGE If mounted on an aircraft rotorcraft initial cleaning may be done using mineral sprits or isopropyl alcohol under pressure Blow dry using clean shop air Do not direct cleaning spray into the heater inlet or exhaust Some heater installations are remote do not allow cleaning fluids to accum
26. Hartzell Engine Technologies LLC 2900 Selma Highway Montgomery AL 36108 USA Tel 334 386 5400 Fax 334 386 5410 COMBUSTION HEATER I SERIES OWNERS MANUAL P N 99M90 HEATER MODELS l 1500 l 2500 l 3500 l 5000 99M90 21 40 01 Title Page Rev New Issued May 9 2012 HARTZELL ENGINE TECHNOLOGIES I Series Combustion Heater Owners Manual Copyright 2012 Hartzell Engine Technologies LLC All rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the prior written permission of Hartzell Engine Technologies LLC 21 40 01 Page ii Issued May 9 2012 99M90 Rev New l Series Combustion Heater Owners Manual DESCRIPTION Table of Contents Title Page Copyright Statement Table of Contents Warning Letter Record of Revisions Record of Temporary Revisions Service Publication List List of Effective Pages List of Illustrations List of Tables AIRWORTHINESS LIMITATIONS A 0 General A 1 Airworthiness Limitation Statement INTRODUCTION 1 0 General information 1 1 About the Manual 1 2 How to Use the Manual 1 3 Definitions 1 4 Model Identification 1 5 Serial Number Identification 1 6 Model Number Identification 1 7 Warranties DESCRIPTION AND OPERATION 2 0 General 2 1 Component Operation 2
27. Inspect all parts visually for damage 2 Inspect the fuel pump electrical resistance by connecting an ohmmeter between the connector terminal and ground on the pump housing Resistance should be between 19 0 and 30 0 ohms for 24 volt models and 4 8 to 12 0 ohms for 12 volt models If resistance is not within limits replace the pump assembly 3 Low pressure pump as shown in Figure 8 7 have a filter screen which may be accessed by removal of the bottom cover 4 Complete cleaning and testing may be done in accordance with the appropriate chapter in the overhaul manual C Installation Typical 1 The HET P N 99M91 Overhaul amp Maintenance manual steps in assembly must be followed to reinstall fuel pump components prior to aircraft installation 2 Attach the fuel pump to the aircraft structure member with the two attaching bolts The radio noise filter bracket must be attached with one of these bolts Make sure a good electrical ground is present and proper polarity connection made 3 Remove tags and caps Connect the inlet and outlet fuel lines and tighten them securely Connect the electrical lead at the radio noise filter connection Be sure the insulator is in place and the connector is locked securely Run the pump for a few minutes to check for fuel leaks Install access panels Refer to the latest revision of the aircraft or rotorcraft service or maintenance manuals as required 99M90 21 40 01 Page 8 13 Rev New
28. Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual 8 11 Fuel Pump Maintenance cont d Outlet Cover Gasket Fig 8 6 Typical Fuel Pump Components low pressure pump Electrical Connections Inlet 8 Outlet Fig 8 7 Typical Fuel Pump Components high pressure pump 21 40 01 99M90 Page 8 14 Issued May 9 2012 Rev New
29. LE 3 1 Troubleshooting TROUBLE PROBABLE CAUSE REMEDY Heater fails to light 99M90 Rev New Master switch or circuit breaker OFF Low voltage supply Fuel cut off from tank Suction leak ahead of pump Insufficient fuel pressure Regulator not operating properly Fuel pump operating but not building up sufficient pressure Restriction in fuel nozzle orifice Fuel heater solenoid not working Fuel lines clogged or broken Fuel filter clogged Ignition vibrator inoperative Manual reset limit overheat switch open Combustion air pressure switch open Defective switch or low combustion air blower output Cycling switch open Duct switch open Turn ON master switch or close circuit breaker See aircraft AFM or POH for operation Apply external power supply Attempt to start heater See aircraft service manual Turn ON manual shutoff valve if used or master solenoid See AFM or POH for operation Secure all fittings Low or no current to fuel pump Check for operation of pump and remove for repairs if not operating Check for low pressure or replace regulator When making fuel pressure check be sure fuel is flowing through nozzle Turn adjusting screw clockwise to increase fuel pressure and counterclockwise to decrease See 99M91 Overhaul amp Maintenance manual Remove and repair or replace fuel pump Remove the nozzle and clean or replace it See 99M91 Overhaul amp Mainte
30. NG TROUBLESHOOTING PROCEDURES MUST BE ACCOMPLISHED BY A QUALIFIED LICENSED MECHANIC OR REPAIRMAN FAMILIAR WITH AIRCRAFT HEATING SYSTEMS FAILURE TO OBSERVE THIS WARNING MAY COMPROMISE THE COMPONENT OR THE APPLICATION IT IS USED IN IMPROPER TROUBLESHOOTING MAY RESULT IN DEATH SERIOUS BODILY INJURY AND OR SUBSTANTIAL PROPERTY DAMAGE WARNING 2 FOLLOWING THE REMEDIES LISTED IN THE TROUBLESHOOTING CHART MAY CREATE HAZARDOUS CONDITIONS FROM THE USE OF GROUND POWER AND VARIOUS AIRCRAFT SYSTEMS USE OF THE HEATER MAY RESULT IN AN UNCONTAINED FIRE OR CARBON MONOXIDE POISONING IF OPERATED INDOORS THESE ACTIONS MAY CAUSE SERIOUS INJURY OR DEATH IF FULL SAFETY PRECAUTIONS ARE NOT OBSERVED The following are some of the service troubles and suggested remedies provided to assist in locating and correcting malfunctions in the heating system The following procedure is based upon the use of the heater assembly and optional components Table 3 1 on the following pages represent five main areas of trouble in the heater Choose the applicable symptom and follow the appropriate recommendations 1 Heater fails to light 4 Heater starts then goes out 2 Heater air blowers fail to run 5 Heater fails to shut off 3 Heater fires but runs unsteady 21 40 01 Page 3 2 Issued May 9 2012 l Series Combustion Heater Owners Manual Rev New l Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES Se 3 2 Troubleshooting cont d TAB
31. TECHNOLOGIES SS ie Chapter 6 TESTING 6 0 General WARNING THERE ARE NO OWNER OPERATOR MAINTENANCE ACTIVITIES PERMITTED ON HET COMBUSTION HEATERS THE FOLLOWING TESTING PROCEDURES MUST BE ACCOMPLISHED BY A QUALIFIED LICENSED MECHANIC OR REPAIRMAN FAMILIAR WITH AIRCRAFT HEATING SYSTEMS FAILURE TO OBSERVE THIS WARNING MAY COMPROMISE THE COMPONENT OR THE APPLICATION IT IS USED IN IMPROPER TESTING MAY RESULT IN DEATH SERIOUS BODILY INJURY AND OR SUBSTANTIAL PROPERTY DAMAGE This chapter gives the tests and inspections required to help determine the condition of the heater removed for scheduled or unscheduled maintenance Refer to the procedures given in the TROUBLESHOOTING Chapter 3 prior to applying any test for unscheduled maintenance For any overhaul activity or maintenance not covered in this manual consult the HET P N 99M91 Overhaul and Maintenance manual All testing activities must be accomplished by properly licensed mechanics or repairmen experienced in aircraft rotorcraft heating systems 6 1 Testing A Equipment 1 Standard tools Standard mechanic s handtools Torque wrench pound inch newton centimeter Torque wrench pound foot newton meter Air compressor shop air 2 Safety Equipment Safety gloves Protective goggles eye protection Ear Plugs hearing protection Safety shoes Protective cotton apron 3 Special tools Special tools used in this chapter are identified by description and as
32. TZELL ENGINE TECHNOLOGIES ee ee pe a MONTGOMERY ALABAMA USA Chapter 7 SPECIAL TOOLS General This chapter indicates the Special tools necessary to perform maintenance or repair These tools are designed use by licensed mechanics or in shops specializing in aircraft combustion heaters The tools in this chapter are those other than standard mechanics hand tools CAUTION THE SPECIAL TOOLS LISTED HEREIN ARE GENERALLY PURCHASED UNLESS AN EQUIVALENT IS INDICATED USING AN IMPROPER TOOL CAN RESULT IN DAMAGE TO THE HEATER AIRCRAFT OR OTHER EQUIPMENT WHICH MAY ALSO LEAD TO PHYSICAL INJURY OR DEATH Required Safety Equipment Safety gloves Safety glasses or Protective goggles Protective apron Eye wash station Material Required Building materials are not required Special Tools Specifications The Special tools listed herein must be purchased Common items are recommendations only and equivalents may be used Armature Growler Model 409 110 volts A C Model 509 220 volts A C Common may be purchased from King Electronics Company Phone 330 935 2867 7291 Swamp Street Fax 330 935 2391 P O Box 547 Toll Free 877 772 5464 Hartville Ohio 44632 0547 Email info O 4king com USA 21 40 01 Page 7 1 Issued May 9 2012 HARTZELL l Series Combustion Heater Owners Manual ENGINE TECHNOLOGIES A ee 7 3 Special Tools Specifications cont d Pressure Decay Test Kit 26E24 1 Kit of required parts for
33. VER INSTALL TYPE OR TYPE II SPARK PLUGS INTO AN I SERIES MODEL l 2500 l 3500 OR l 5000 COMBUSTION HEATER TYPE I IS USED IN l 1500 ONLY DAMAGE MAY OCCUR TO THE HEATER IGNITION UNIT OR THE HEATER MAY NOT FUNCTION OPERATION OF A HEATER WITH A DAMAGED IGNITION UNIT MAY RESULT IN EQUIPMENT DAMAGE OR PHYSICAL INJURY 0 050 to 0 060 inch Bend to Adjust 0 127 to 0 152 cm Center Electrode Ground Electrode FIGURE 6 1 Type Spark Plug Used in l 1500 model only Type II Spark Plug Installed in Fixture FIGURE 6 2 Type II Spark Plug For identification purpose only 21 40 01 99M90 Page 6 4 Issued May 9 2012 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES SS EE 6 4 Testing Spark Plug cont d NOTE If the Type IIl spark plug fails to clean up properly and or if electrodes are badly eroded it should be replaced NO RE GAPPING OF TYPE lll SPARK PLUG IS POSSIBLE DO NOT BEND THE CENTER ELECTRODE OR THE DISK ON TOP OF THE CENTER ELECTRODE Testing Type I Spark Plug Make sure that the spark plug is gapped properly by carefully bending the ground electrode until a 0 055 inch feeler gage can be inserted between between the end of the center electrode and the ground electrode The spark plug can be checked visually for sparking across the gap prior to installing the plug as follows Disconnect the wire from the No 3 terminal on the heater wiring side of the terminal strip to dc ener
34. Y ALABAMA USA 8 11 Fuel Pump Maintenance See applicable aircraft service manual The heater fuel pump or pumps are largely dependent on the design of the particular installation on a specific aircraft or rotorcraft Some installations require low pressure or high pressure pumps and others require two pumps placed in series to obtain the pressure and flow required for supplying fuel from a tank to the heater The information is typical and is an example of many heater installations See Figure 8 7 amp 8 8 A Removal Typical 1 Remove access panels required to reach the fuel pump assembly Many aircraft will have heater fuel pumps located away from the heater assembly or in isolated locations Refer to the aircraft or rotorcraft maintenance manuals as necessary to locate and remove them 2 Remove all electrical power Shut off the fuel supply to the pump disconnect electrical lead and fuel lines Provide a method to catch residual or spilled fuel Exercise care to avoid losing the insulator in the electrical connector Unless the fuel lines are rigid enough to remain in their original locations be sure to cap and tag them for proper connection during reinstallation 3 Remove the attaching bolts from the fuel pump bracket and remove the fuel pump from the aircraft 4 The HET P N 99M91 Overhaul amp Maintenance manual steps in disassembly must be followed to remove fuel pump components B Inspection and test Typical 1
35. aintenance 8 12 8 9 Combustion Tube Maintenance 8 12 8 10 Miscellaneous Components Maintenance 8 12 8 11 Fuel Pump Maintenance 8 13 21 40 01 99M90 Page iv Issued May 9 2012 Rev New I Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES MONTGOMERY ALABAMA USA Warning Owners and Operators that fly must recognize that there are inherent risks involved in this activity Therefore every precaution in maintenance and training must be taken to minimize these risks as it is unlikely that they can be eliminated entirely The cabin heaters listed herein are a critical component of the aircraft Any failure of the combustion heater may result in a delay in departure dangerous drop in cabin temperatures smoke fire or even more severe consequences that may result in injury or death Heaters are subject to wear based on conditions that may make the same unit life vary from airplane to airplane and condition to condition The majority of our heaters are used in personal or business airplanes and rotorcraft that subject them to usage that ranges from every flight to seasonal flights with long periods of inactivity Each heater certified must demonstrate an adequate margin of safety before it is considered as safe to operate in an airplane or rotorcraft Most heater installations are performed by the airframe man ufacturer and many systems and components are added to the heater assembly Even when every pre ca
36. al HARTZELL ENGINE TECHNOLOGIES ero gen ae ae MONTGOMERY ALABAMA USA Chapter 5 CHECK 5 0 General This chapter calls out the various checks and inspections needed to assure reliable and safe operation of the combustion heater while in service It is the owners responsibility to observe and understand the task and the time it occurs These required checks are listed in hours time in service TIS or calendar time whichever is applicable Some checks are one time initial and others are recurring Refer to the appropriate chapter as required for the specific check in this manual or in the Overhaul amp Maintenance manual P N 99M91 Use only one method to determine TIS for inspection and maintenance actual heater Hobbs meter time or calculation from flight time never use both These Checks must be accomplished by properly licensed mechanics or repairmen experienced in aircraft rotorcraft heating systems Owners performing an annual inspection should note the first to occur is the TIS requirement which may come prior to or after the annual inspection calender time is reached 5 1 Preflight and or Daily Inspection Checks all heaters 1 Inspect the ventilating air inlet scoop combustion air inlet scoop exhaust outlet and fuel drain for possible obstructions Make sure that all of these openings are clear of any restrictions and that no damage has occurred to air scoop protrusions 2 During preflight inspections look in the
37. anuals should be directed to Hartzell Engine Technologies LLC 2900 Selma Highway Montgomery AL 36108 Tel 334 386 5400 Fax 334 386 5410 or by our website http www hartzellenginetech com contact 1 3 Definitions This paragraph defines the warnings and notifications used in this manual Warnings place critical attention to use of tools materials procedures or limitations which must be followed without deviation to avoid injury to the technician or other persons Cautions place immediate attention to use of tools and procedures which must be followed to avoid damage to equipment and facilities Notes call attention to procedures which make the job easier The following are basic definitions of the terms used herein as related to this manual AMMETER The device for measuring electrical current in variations of amperes BRUSH Device for transmitting current through the commutator to the armature Itis a composite carbon block which includes a spring lead and contact COMBUSTION AIR The air forced into the combustion area via an electric motor and fan assembly or ram air for the purpose of enhancing and maintaining heater combustion COMBUSTION AIR DIFFERENTIAL The differential pressure is the difference between pressure of combustion air coming into the heater and pressure at the exhaust outlet of the heater This differential is used with the Combustion Air Pressure Switch COMBUSTION TUBE The tubular device which co
38. area of the combustion heater exhaust tube for large or unusual accumulations of soot on the skin of the aircraft Soot accumulates are caused by the heater burning at a fuel rich condition 5 2 Operational Check Typical Heater An operational check should be performed prior to commencing any inspection interval or prior to any unscheduled maintenance to help determine the heater condition 1 Place the MASTER SWITCH in the ON or HEAT position The ventilating air blower and combustion air blower should operate and the red HEATER FAILURE LIGHT should be energized Always refer to the aircraft AFM or POH to assure proper operation 2 Operate both the combustion air blower and ventilating air blower and check each for unusual current draw noise or vibrations Refer to Table 3 1 for troubleshooting and for recommended maintenance 3 To proceed with the operational check follow Chapter 2 para 2 2 entitled Operating Procedure This procedure should be repeated several times or as needed 5 3 Periodic Inspection Checks Note As many B Series combustion heaters have been upgraded to I Series heaters certain publications previously issued may still be relevant If you heater has been upgraded to l Series heater you should reference the latest revisions of the following publications to assure compliance SB A 101 Rev G SB A 104 Rev B SB A 107A SB A 108 and SB A 110B 10 Hours time in service one time overhauled rebuilt
39. art No 74D01 3 IS Part No 82D20 1 IS 88D81 2 IS 90D38 1 IS 90D38 2 IS 91E88 1 IS 96C62 1 IS 90E00 1 IS 90E14 1 1S 91E18 1 IS 99C80 2 IS 94E11 1 IS indicates kerosene fuel burning heater assemblies indicates pressurized heater Table 1 1 Basic Model Numbers Inconel 21 40 01 Page 1 6 Issued May 9 2012 99M90 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES Be 1 7 Warranties Hartzell Engine Technologies LLC HET offers a Limited warranty with each new overhauled or rebuilt heater assembly or component parts it sells through it s distribution system NO expressed or implied warranty exists when repairing overhauling or rebuilding any assembly or component using this manual except as it may already apply to any new HET replacement part purchased If you suspect that any warranty applies to the HET heater assembly it must be returned through an authorized HET distributor in a manner prescribed by that specific distributor The affected heater must be received by the factory fully assembled and not altered in any way for disposition by HET warranty department Warranty shall be denied for any heater received altered modified or disassembled The HET Limited warranty policy in affect for your heater was delivered with the unit at the time of purchase As the Warranty policy is revised from time to time you must check the policy deli
40. ation overheat or burns Move harness or wires and check for looseness at the terminal strip 6 Operation Perform an operational check of the heating system per Chapter 2 of this manual however should any discrepancies between instructions from the aircraft or rotorcraft AFM or POH appear the AFM or POH instructions shall take precedent 8 2 Periodic Maintenance For Series Combustion Heaters the periodic inspection and overhaul requirements may be found in this manual in Chapter 5 8 3 Overhaul amp Maintenance Manual For Series Combustion Heaters the detailed instructions for overhaul and maintenance may be found in P N 99M91 Overhaul amp Maintenance which must be obtained separately 21 40 01 99M90 Page 8 2 Issued May 9 2012 Rev New l Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES a N MONTGOMERY ALABAMA USA 8 4 Combustion Air Blower Maintenance Refer to Figure 8 1 amp 8 2 99M90 Rev New A Removal i 2 3 Remove access panels if necessary to reach the combustion air blower assembly Disconnect the electrical cable connection at the most convenient location Disconnect the air tube between the blower and combustion air adapter on the heater If the combustion air blower inlet adapter is used disconnect it from the inlet tubing This will depend upon the type of connecting tubing used and the method of attachment Disengage the clamp that secures the combu
41. ation However the customer control circuit can and will vary in different installations and may have additions or changes added by the aircraft rotorcraft design holder 1 The Master Switch is connected in the line that supplies electrical power to all heater equipment and controls When this switch is in the OFF position the entire heater system is inoperative This switch can have a vent position which permits use of the ventilating air blower to circulate cool air through the system for summer ground operation With the switch in VENT position the heater is inoperative and only the ventilating air blower is energized The HEATER START SWITCH is a normally open momentary ON switch that supplies power to lock in the safety relay through which power is supplied to the ignition and fuel circuits of the heater The HEATER STOP SWITCH is a normally closed momentary OFF switch that de energizes or breaks the lock in power to the safety relay to stop the heater fuel supply and ignition Operating Procedure 1 21 40 01 Page 2 6 Issued May 9 2012 Place the MASTER SWITCH in the ON or HEAT position The ventilating air and combustion air blowers should operate and the red HEATER FAILURE LIGHT should be on Energize then release the HEATER START SWITCH The red HEATER FAILURE LIGHT should de energize go out and the green HEATER RUNNING LIGHT should energize light The heater will ignit
42. cay testing This test is intended to be accomplished while the heater is installed with a minimum of accessory disconnection When necessary or desired for convenience the heater assembly may be removed from the aircraft rotorcraft to conduct the pressure decay test It is recommended but not required that the Pressure Decay Tester P N PDT 285B or P N PDT 286B be used for this test 21 40 01 99M90 Page 6 2 Issued May 9 2012 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES Ae 6 3 Testing Combustion Air Blower After Brush Change After installing new brushes it is advisable to run in the brushes as follows Connect the motor to a controlled voltage supply rheostat in a 28 volt DC line for 28 volt motor and a 12 volt line for 12 volt motor Operate the motor at approximately 1 2 its normal speed for the first hour then gradually increase the speed until it is rotating at approximately normal speed Continue the run in operation for at least two hours to properly seat the brushes before installing the blower in the aircraft rotorcraft 6 4 Testing Spark Plug WARNING DO NOT ARC IGNITION LEAD TO ANY GROUND EXCEPT THROUGH APPROVED SPARK PLUG GROUND ELECTRODES GROUNDING LEAD TO JACKET IS DANGEROUS AND MAY CAUSE INJURY AND DAMAGE TO THE HEATER IGNITION UNIT FAILURE TO TEST THE SPARK PLUG AND OR THE IGNITION ASSEMBLY BY THE PRESCRIBED SPARK PLUG METHOD WILL RESULT IN DAMAGE TO THE LEAD ASSEMBLY
43. ce the vibrator protrudes out of the ignition assembly to determine when the new unit is inserted properly Grasp the vibrator and with a slight back and forth movement pull it straight out of the ignition unit For a friction grip it may be necessary to use a piece of masking or friction tape around the exposed portion of vibrator 3 To install the new vibrator carefully rotate the vibrator until the index marks are aligned and the connector pins on the vibrator can be felt entering the pin sockets in the vibrator socket then press the vibrator fully and firmly into position Replace the vibrator in the ignition unit at each overhaul or if it has failed 4 Check the heater for operation and close all access openings Vibrator Ignition Box Fig 8 3 Typical Ignition System non pressurized heater 99M90 21 40 01 Page 8 7 Rev New Issued May 9 2012 l Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES A 8 7 Ventilating Air Blower Maintenance A Removal See Figure 8 4 1 If the heater is equipped with an adapter and screen assembly remove it from the blower housing by removing the three screws and lockwashers 2 Loosen the four screws and rotate the blower and motor housing to disengage the notched end from the four screws in the end of the heater jacket Remove the grommet and separate the two electrical quick disconnects after sliding back the insulator sleeves on the wire ends 3 T
44. d and slide the tubing into position at the point where it was disconnected during removal Do not tighten until after tightening the motor in the attaching strap 4 Tighten the blower motor mounting strap securely making certain the air tubing is in proper alignment 5 Secure the air tubing by tightening the clamp or installing the sheet metal attaching screws 6 Connect the wire lead at the quick disconnect terminal Be sure to slide an insulating sleeve over the connection or tape it in order to prevent any possible short circuits Tie the sleeve in place 7 Connect the ground lead securely to the aircraft under one of the motor mounting screws 8 Check motor operation and re install access panels By disconnecting the wire at the No 3 terminal on heater terminal strip blower can be operated without fuel flow to the heater Removing the wire from terminal No 3 will shut off the fuel solenoid valve and allow the motor to run without fuel spray from the nozzle 21 40 01 99M90 Page 8 4 Issued May 9 2012 Rev New I Series Combustion Heater Owners Manual 8 4 99M90 Rev New Combustion Air Blower Maintenance cont d Fig 8 1 Typical Combustion Air Blower Assemblies round RFI Filter Brush Ass y amp Cap Screw SPECIAL ACCESSORY EQUIPMENT Fig 8 2 Typical Combustion Air Blower Assemblies square HARTZELL ENGINE TECHNOLOGIES a MONTGOMERY ALABAMA USA 21 40 01 Pag
45. e 8 5 Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual 8 5 Spark Plug Maintenance 21 40 01 Page 8 6 WARNING FAILURE TO TEST THE SPARK PLUG AND OR THE IGNITION ASSEMBLY BY METHODS LISTED HEREIN WILL RESULT IN DAMAGE TO THE LEAD ASSEMBLY COIL ASSEMBLY SPARK PLUG OR VIBRATOR IT CAN SHORTEN THE USEFUL LIFE OF THESE ITEMS AND MORE IMPORTANT LY IT CAN CAUSE SERIOUS INJURY OR DEATH DUE TO ELECTRICAL SHOCK AND OR BURNS Three types of spark plugs are used on HET combustion heaters The l Series Aircraft Combustion Heaters uses a Type lll in all models except the l 1500 which uses a Type I The Type and Type III are described and pictured in Chapter 6 Figures 6 1 and 6 3 of this manual All of the testing procedures for the spark plug are Chapter 6 as well WARNING DO NOT ARC IGNITION LEAD TO ANY GROUND EXCEPT THROUGH APPROVED SPARK PLUG GROUND ELECTRODES GROUNDING LEAD TO JACKET IS DANGEROUS AND MAY CAUSE INJURY AND DAMAGE TO THE HEATER IGNITION UNIT FAILURE TO TEST THE SPARK PLUG AND OR THE IGNITION ASSEMBLY BY THE PRESCRIBED TYPE III SPARK PLUG METHOD WILL RESULT IN DAMAGE TO THE LEAD ASSEMBLY COIL ASSEMBLY SPARK PLUG OR VIBRATOR AND MAY SHORTEN THE USEFUL LIFE OF THESE ITEMS DO NOT TOUCH THE SPARK PLUG WHILE ENERGIZED IT HAS DANGEROUSLY HIGH VOLTAGE AND MAY CAUSE INJURY OR EVEN DEATH MAKE SURE TO PLUG THE SPARK PLUG HOLE IN THE HEATER TO PREVENT ANY POSSIBILITY OF
46. e and continue to operate A short time lag may be required for the fuel pump to purge the fuel lines of air bubbles This time lag should not be more than ten seconds except in cases where the fuel line has been drained due to maintenance overhaul being performed The DUCT SWITCH can be set to regulate the cabin temperature for desired comfort level If this switch is set for ground operating comfort it may be necessary to reposition it since ram air will increase the ventilating air flow and the heater output To stop heater operation push then release the HEATER STOP SWITCH The heater will de energize and the red HEATER FAILURE LIGHT will then energize The green HEATER RUNNING LIGHT will be de energized The blowers should be allowed to operate for several minutes to cool and purge the heater after operation To stop blower operation de energize or turn OFF the MASTER SWITCH 99M90 l Series Combustion Heater Owners Manual Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES Chapter 3 TROUBLESHOOTING 3 0 General The purpose of this chapter is to provide a troubleshooting reference for the owner operator to help diagnose conditions that may be found in the heater operation before placing the aircraft rotorcraft into service repair The owners responsibility in this chapter is to observe and record the fault The cabin combustion heater is virtually a self contained desi
47. e frequency of which should be determined by the type of service and the conditions under which the aircraft or rotorcraft is operated It is recommended that in addition to the periodic inspection requirements inspection maintenance should be made at least twice a year preferably to coincide with the onset of cold weather and warm weather Include the following 1 Fuel System After any warm season or inactivity and prior to cool weather use check the fuel system for contamination 2 Air System Check the inlet from outside air and the outlet into the aircraft cabin if the heater has been inactive After active use check the heater air inlets and cabin air outlets which may become clogged or damaged due to ground debris or icing 3 Ignition System Prior to or after active heater use inspect and clean the spark plug lead end and spring 4 Exhaust System Examine the exhaust tube and shroud if applicable for security from the heater through the aircraft skin 5 Electrical System Check the wiring harness for evidence of deterioration of insulation burns or overheat Check for looseness at the terminal strip 6 Operation Perform an operational check of the heating system per Chapter 2 of this manual For amplified description and procedures for the Bi Annual Maintenance Check refer to Chapter 8 section 8 1 21 40 01 99M90 Page 5 4 Issued May 9 2012 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE
48. erhauling the heater However the nozzle is difficult to remove and replace so the P N 99M91 Overhaul amp Maintenance manual steps in disassembly and assembly must be followed to remove and reinstall or replace the nozzle Cleaning and testing may be done in accordance with the appropriate chapters in the overhaul manual 8 9 Combustion Tube Maintenance No periodic maintenance is required on the combustion tube However if an I Series combustion tube fails a pressure decay test at any time it will need to be replaced Specific inspection times are outlined in Chapter 5 please note specific requirements No Weld Repairs are Permitted Make a general combustion tube inspection if you suspect that the heater has suffered an over temperature or if the heater has been inactive for extended periods The combustion tube cannot be seen without disassembly however evidence may be seen in accessible areas inside the heater Inspection may be accomplished using flexible optics passed into the exhaust or air inlet If evidence of damage is found perform a pressure decay test prior to further operation 8 10 Miscellaneous Components Maintenance Inspection and Servicing NOTE All discrepant parts must be replaced with approved new HET parts and components Destroy and discard removed parts Refer to the applicable portion of the P N 99M91 Overhaul amp Maintenance manual IPC for specific part numbers for the heater being worked on
49. etween the legs of the motor bracket and blower housing 5 Make sure all four wires are routed and grommeted as they were prior to disassembly and install the two screws flat washers and new grommets at the two lower edges securing the motor bracket assembly Then install the grommet flat washer nut and screw in the remaining upper corner of the motor bracket assembly 6 Center the motor bracket in the housing and tighten the screw to secure it The motor should be positioned in the bracket to locate the blower wheel properly in the blower housing The blower wheel should be positioned so it will rotate freely and just clear the contoured spill plate in the blower housing Tighten the Allen head set screw and spin the blower wheel by hand for a clearance check Then apply appropriate voltage to run the motor as a final clearance check 7 Attach the adapter and screen assembly if used to the end of blower housing with three screws and lockwashers 21 40 01 99M90 Page 8 8 Issued May 9 2012 Rev New l Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES SS a N MONTGOMERY ALABAMA USA 8 7 Ventilating Air Blower Maintenance cont d NOTE Due to the variation in motor availability the motor installed in your particular installation may not have available brushes or replaceable brushes In this case the motor must be replaced D Brush Removal internal brush See Figure 8 5 Remove nuts a
50. f removal After installing new brushes it is advisable to run in the brushes as follows Connect the motor to a controlled voltage supply rheostat in a 28 volt DC line for 28 volt motor and a 12 volt line for 12 volt motor Operate the motor at approximately 1 2 its normal speed for the first hour then gradually increase the speed until it is rotating at approximately normal speed Continue the run in operation for at least two hours to properly seat the brushes before installing the blower in the aircraft 21 40 01 Page 8 3 Issued May 9 2012 HARTZELL l Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual 8 4 Combustion Air Blower Maintenance cont d C Installation Refer to Figure 8 1 amp 8 2 1 Prior to installing the combustion air blower inspect all parts of the assembly for loose screws loose nuts and poor ground connection on the blower housing Make sure the blower wheel is tight on the shaft and properly located in the housing It should have just enough clearance to rotate at full speed without binding against the spill plate Blower performance is based upon this close tolerance clearance It is recommended that correct voltage be applied for this clearance check 2 Install the blower inlet adapter in the same orientation as before removal not used on all installations 3 Place the combustion air blower assembly in position in the attaching clamp so the air tubing can be connecte
51. gn however there are many variations in the aircraft rotorcraft design from manufacturer to manufacturer and model to model Experience has demonstrated that many causes of heater maladies lie with faulty airframe designs such as air supply electrical systems or fuel routing The overall objective of troubleshooting is to find the root cause of trouble and take corrective action to prevent a recurrence This chapter provides some basic troubleshooting procedures for the heater assembly for unscheduled maintenance It gives procedures to follow to determine the best course of action prior to maintenance or repair Upon determination of fault s an appropriately licensed or approved mechanic may proceed with repairs and should refer to Chapter 6 testing or Chapter 8 Maintenance for the appropriate action s or requirement 3 1 Procedure Prior to Repair WARNING FOR APPROVED MECHANICS SERVICING OR REPAIRING THE HEATER GREAT CARE AND CAUTION MUST BE TAKEN TO AVOID HAZARDOUS SITUATIONS WHEN MOUNTED AND USED ON OR OFF AN AIRCRAFT OR ROTORCRAFT THE HEATER WILL PRESENT A PHYSICAL HAZARD FROM THE USE OF AVIATION FUEL AND POTENTIAL UNCONTAINED FIRE IN THE SURROUNDING AREA IN ADDITION HEATER IGNITION SYSTEMS SUPPLY HIGH VOLTAGE ELECTRICAL CURRENT WHICH PRESENTS BOTH PHYSICAL SHOCK HAZARD THAT CAN RESULT IN SERIOUS INJURY IF PROCEDURES IN THIS MANUAL OR IN THE AIRCRAFT ROTORCRAFT SERVICE MANUALS ARE NOT FOLLOWED Note It is required to refe
52. igure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure 99M90 Rev New 2 1 2 2 2 3 2 4 2 5 2 6 2 7 4 1 4 2 6 1 6 2 6 3 8 1 8 2 8 3 8 4 8 5 8 6 8 7 List of Illustrations Cutaway of Typical I Series Heater Whirling Flame Depiction Electrical Fuel Pump Aviation Gasoline Electrical Fuel Pump Aviation Kerosene Vent Air Blower Assembly Combustion Air Blower Assembly Typical CA Blower Air Inlet Typical Type Spark Plug Cleaning Type III Spark Plug Cleaning Type Spark Plug Gap Used in l 1500 model only Type II Spark Plug for LD purpose only Type III Spark Plug Gap Typical Combustion Air Blower round Typical Combustion Air Blower Square Typical Ignition System non pressurized heater Typical Ventilating Air Blower non pressurized heater Typical Ventilating Air Blower pressurized heater Typical Fuel Pump Components low pressure Typical Fuel Pump Components high pressure HARTZELL ENGINE TECHNOLOGIES a PAGE 2 1 2 3 2 3 2 5 2 5 2 5 2 3 2 4 6 4 6 4 21 40 01 Page xv Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual SE Ee INTENTIONALLY LEFT BLANK 21 40 01 99M90 Page xvi Issued May 9 2012 Rev New I Series Combustion Heater Owners Manual Table Table 99M90 Rev New 1 1 3 1 List of Tables
53. ing any work 99M90 21 40 01 Page 1 1 Rev New Issued May 9 2012 l Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES _ MONTGOMERY ALABAMA USA 1 0 General Information cont d A All models of the Series Combustion Heaters are considered herein These models are essentially the same They have the same tube diameters but vary in length according to their BTU capacity These also vary with components for 12 or 24 volt operation Both gasoline and kerosene burning models are available The I Series models use Inconel combustion tubes which do not apply to the current B Series heater AD Model l 1500 is smaller in diameter B The manual describes maintenance on heater or components as they may be installed on the aircraft rotorcraft Maintenance tasks must be accomplished by competent qualified personnel using appropriate equipment There is no owner preventative maintenance permitted on combustion heaters C Maintenance tasks and subtasks may be included however detailed maintenance and overhaul tasks are not Refer to the heater overhaul and maintenance manual D The manual contains Description operation troubleshooting and other basic service information E If reference to aircraft rotorcraft installation application is needed refer to the HET website http www hartzellenginetech com Aircraft rotorcraft application data must be used for reference only as the installation of a
54. ircraft and many tests are contained in the applicable aircraft or rotorcraft service maintenance manuals These manuals should be checked for applicability prior to assembly of the heater 99M90 21 40 01 Page 6 5 Rev New Issued May 9 2012 l Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES ee _ MONTGOMERY ALABAMA USA 6 5 Testing Miscellaneous and Optional Components cont d A Test ventilating air and combustion air motors for correct rpm and current draw 1 Connect motor to correct voltage power supply 12 or 24 volts DC Rotation should be counter clockwise when viewed from the shaft end 2 Both motors should rotate at approximately 7500 rpm at rated voltage Current draw for 12 volt motors is approximately five amps and for 24 volt motors is approximately 2 9 amps This can be tested using a mechanical or optical tachometer 3 If current draw is excessive or if speed is too low replace the brushes Recheck both current draw and rpm after brushes are properly run in Refer to Para 6 3 for run in 4 If after replacing brushes operation is still unsatisfactory replace the motor The motor checks described above should be made without the blower housing attached for both the ventilating air and combustion air motors 21 40 01 99M90 Page 6 6 Issued May 9 2012 Rev New I Series Combustion Heater Owners Manual 7 0 7 1 7 2 7 3 99M90 Rev New HAR
55. mbustion air blower assembly for security of mounting tube connections and wiring Tighten any loose electrical terminals and air tube connections 7 Operate both the combustion air blower and ventilating air blower and check for unusual noise or vibrations Refer to Table 3 1 Troubleshooting for diagnosis 9 Following the 100 hour inspection perform the preflight operating check as described in Chapter 5 paragraph 5 2 Series heaters use Inconel steel combustion tubes which are marked IS at the end of the applicable part number for identification 21 40 01 99M90 Page 5 2 Issued May 9 2012 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES ee 5 3 Periodic Inspection Checks cont d 500 Hours time in service and each 500 hours thereafter or 60 months the first to occur Inspection shall be conducted on all I Series heaters including new rebuilt upgraded or overhauled The 500 Hour Inspection coincides with the requirements of the 100 hour inspection plus the following checks and inspections 1 Perform the Pressure Decay Test per the instructions contained in P N 99M91 Overhaul amp Maintenance manual Failure of the Pressure Decay Test requires heater overhaul prior to next use Replace the spark plug and fuel nozzle Replace brushes and bearings in the combustion air and ventilating air blower motors If sealed motor replace motor 1000 Hours time in service or
56. mpetent persons In addition observe the following precautions 1 Disconnect the battery or any ground power source before connecting or disconnecting test instruments except voltmeter or before removing or replacing any unit Accidental grounding or shorting of power from the battery may cause severe damage to the test instruments heater components and or heater or airframe wiring 2 If the heater is tested on an aircraft rotorcraft to observe heater performance make sure that the area in and around the aircraft rotorcraft is secure and the testing area is well ventilated Make sure that all staff and personnel are warned that testing is progress 3 If the heater is being tested on the bench and combustion will occur be sure that the heater is retained and secure before power and fuel are applied Make sure that the air inlet is clear and the exhaust has been routed to outside air without leaks Make sure the fuel source is well away from the heater or any ignition sources The fuel source must come from an approved fuel container 6 2 Pressure Decay Test Evaluation of the condition of the combustion chamber is a vital task in maintaining the combustion heater until overhaul time is reached It shall be made at the 500 hour inspection and each 500 hours thereafter or 60 months the first to occur The latest revision of applicable heater related service publications must be reviewed and complied with if required in preparation for de
57. nance manual Testing chapter Remove and check solenoid Replace if faulty Inspect all lines and connections It may be necessary to disconnect lines at various points to determine where the restriction is located Clean fuel filter element Check for biologicals corrosion and ice in fuel system Replace vibrator check for defective radio noise filter Press reset button firmly and recheck to determine reason for switch opening Check for low blower output due to low voltage and correct it If switch is defective replace it See 99M91 Overhaul amp Maintenance manual Replace if defective Operate control to see if switch will come on Replace switch if defective 21 40 01 Page 3 3 Issued May 9 2012 HARTZELL ENGINE TECHNOLOGIES A l Series Combustion Heater Owners Manual 3 2 Troubleshooting cont d Ventilating air blower fails to run Combustion air blower fails to run Heater fires but burns unsteadily 21 40 01 Page 3 4 Issued May 9 2012 TABLE 3 1 Troubleshooting cont d TROUBLE PROBABLE CAUSE REMEDY MASTER switch OFF Broken or loose wiring to motor Circuit breaker open Worn motor brushes Blower wheel jammed Motor burned out Defective radio noise filter Faulty wiring to motor Poor ground connection Worn motor brushes Blower wheel jammed Usually indicated by hot motor housing Defective radio noise filter Faulty or burned out motor
58. nce RFI Radio Frequency Interference Electrical interference created from commutator brush connection the coil controller or other poor connections SELF PILOTING FLAME The whirling flame design is stable and sustains combustion under the most adverse conditions because it is whirled around itself many times Therefore ignition is continuous and the combustion process will continue until fuel is removed SHORTED Common term for a connection which has zero or very little resistance as seen on an Ohmmeter in an electrical circuit SPRAY NOZZLE The device provided to atomize fuel in a specific pattern to maximize efficient fuel burn in the combustion tube TERMINALS Studs screws or other connections provide access for electrical power VENTILATING AIR The air forced through and around the combustion tube via electric motor and fan assembly for the purpose of supplying clean heated air to the aircraft or rotorcraft cabin VIBRATOR Device which provides a specific frequency of electrical current to the spark plug through the ignition to maintain proper fuel burn in the combustion tube of the heater VOLT OHM METER Instrument used to measure voltage current or resistance DVM WHIRLING FLAME Air entering the combustion chamber tangent to its surface imparts a whirling or spinning action to the air that when fuel is added provides a self sustaining flame l Series Combustion Heater Owners Manual 99M90 Rev New I Serie
59. nd washers Remove back shell Remove secondary nuts and washers Carefully remove brush holder assembly Unsolder and remove brush and spring Remove brush and spring Remove foreign material from brush guides and commutator with a stream of filtered Compressed Air E Brush Removal External brush See Figure 8 4 mum bk oh 1 Remove brush screw cap 2 Remove brush and spring assembly F Brush Inspection all 1 Remove the brushes one at a time from motors viewed in Fig 8 4 8 8 5 by removing the brush cap and carefully withdrawing the brush from its guide or holder internal noting the orientation of the brush for later reinstallation Remove foreign material from the brush guide and commutator with a stream of filtered oil free compressed air Check for brush wear Inspect the commutator for grooved brush pitting or burning The commutator surface should be smooth and medium brown in color Replace the motor if the commutator or other parts show damage 2 Inspect the brush for wear If brushes are worn to a length of 3 16 or less they must be replaced If this limit has not been reached the brushes may be reinstalled in the orientation noted in step 1 3 Inspect the commutator for grooved brush tracks pitting or burning The commutator should be smooth and medium brown in color Replace motor if the commutator or other parts show damage Reverse above procedure for re assembly G Brush Installation Internal brush
60. never these pumps are part of the installation In many cases this fuel pump type and it s location are controlled by the aircraft or rotorcraft design holder FIGURE 2 3 Electrical Fuel Pump Aviation Gasoline FIGURE 2 4 Electric Fuel Pumps used with Aviation Kerosene Fuel Applications 99M90 21 40 01 Page 2 3 Rev New Issued May 9 2012 l Series Combustion Heater Owners Manual HARTZELL MONTGOMERY ALABAMA USA DESCRIPTION 2 1 Component Operation cont d There are several additional components required to allow the heater to function effectively These components are used on most models but not all will vary with heater application The description below provides a better understanding of how typical heaters of various types function The Pressure Relief Valve The relief valve is used as its name implies for relieving excessive pressure build up in the heater fuel system lt must be used whenever kerosene fuel is used but may also be used in gasoline applications in the heater installation Fuel Regulator and Shutoff Valve This unit provides preset regulated fuel pressure as well as remote shutoff to the heater regardless of fuel inlet pressure variations It may be installed remote from the heater Fuel Feed Nozzle Holder amp Solenoid Valve This assembly is mounted at the inlet end of the heater combustion chamber and shuts off fuel to the heater when any one of the temperature cont
61. ng 1 Fuel System After any warm season or inactivity the fuel system and prior to cool weather use check the fuel system for contamination Filters scuppers or lines will grow biologicals during warm temperatures and clog them especially Jet Fuels Water and other common contaminant s may clog or corrode lines Flush and inspect the fuel system prior to active heater use 2 Air System The inlet from outside air and the outlet into the aircraft cabin may develop obstructions during heater inactivity Animal or insect obstructions may develop in any part of the air system as well as general debris In addition after active use the air inlets for heater or cabin air may become damaged due to ground debris or icing Prior to running heater ventilation and combustion air blowers inspect and clean the inlet and outlet air system Run the blowers to push out any debris from the heater and inspect and clean again 3 Ignition System Prior to active heater use and again after the active heater use inspect and clean the spark plug lead end and spring 4 Exhaust System Examine the exhaust tube and shroud if applicable for security from the heater through the aircraft skin Make sure any extension is secure If the exhaust shows evidence of excessive sooting further maintenance is required but at a minimum the spark plug should be cleaned and gapped 5 Electrical System Check the wiring harness for evidence of deterioration of insul
62. ng must be done using low pressure air to avoid damage to wire insulation air drying is preferred If hardware does not clean sufficiently with degreaser or solvents replace the hardware with new Hardware is a required replacement part for overhaul Non metallic components Plastic or fiber components such as insulators must be cleaned with isopropyl alcohol Fiber components that have absorbed or wicked oil cannot be cleaned effectively and should be replaced Electrical terminals or strips may be cleaned with electrical contact cleaner Wipe or spray soak and air dry 21 40 01 99M90 Page 4 2 Issued May 9 2012 Rev New l Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES 4 5 Spark Plug Cleaning 99M90 Rev New Type I Spark Plug for l 1500 model only Cleaning is accomplished on a conventional aircraft type spark plug cleaner except that it may be necessary to use several adapters in order to raise the long extension of the plug far enough out of the cleaner nozzle opening to provide an effective job Plug the ceramic insert cavity at the terminal end of the plug with a piece of paper or cloth to keep out any of the cleaning sand Wipe this cavity out thoroughly with a cloth If after cleaning spark plug porcelain is then white and the electrodes are not eroded re gap the spark plug as described in Chapter 6 Refer to Chapter 8 for additional maintenance details Center Electrode
63. ntains the fuel air combustion that provides a heat source via radiant heat to the ventilating air being forced past it and on to the cabin 99M90 21 40 01 Page 1 3 Rev New Issued May 9 2012 HARTZELL ENGINE TECHNOLOGIES SS MONTGOMERY ALABAMA USA Issued May 9 2012 CONTINUITY The continuous path for the flow of current in an electrical circuit DESIGN HOLDER This may be defined as the company or entity responsible for design and certification of an aviation product Type Certificate TC Supplemental Type Certificates STC and Form 337 Field Approvals or foreign equivalents are typical examples HEATER COMBUSTION The complete unit which transforms chemical energy fuel to heat energy by contained combustion via electrical ignition and forced air movement HEATER MOTOR Device that supplies rotational force from the motor to a fan for the purpose of moving air for combustion or ventilation Combustion or Ventilating Air Blowers JACKET The external housing which covers the heater liner and combustion tube assemblies INSULATOR Component that resists the flow of electricity Typically used to isolate electrical wiring but may also be used in reference to heat insulation LEAKAGE Dissipation of voltage or current from a component or connection May also be used in terms of fuel air pressure heat or exhaust OPEN Electrical term for a complete disruption in electrical current Infinite resista
64. o remove the motor from the housing first loosen the Allen head set screw Remove the fan May require penetrating oil to loosen the fan from the shaft Loosen the screw from the motor bracket in the housing 4 Carefully remove the wiring through the motor bracket grommets note positioning Remove the motor 5 Remove the screw nut and flat washer in the upper corner of the motor bracket assembly Remove the two screws flat washers and new grommets at the two lower edges securing the motor bracket assembly Remove bracket B Inspection 1 Inspect the housing and bracket for cracks corrosion and damage Inspect the blower wheel for broken or bent vanes and replace it for either condition C Installation See Figure 8 4 1 Insert the ventilating air motor into the motor bracket assembly slide the blower wheel on the end of motor shaft and rotate it until the set screw is aligned with the flat side of the motor shaft Tighten the set screw just tight enough to hold it at this time 2 Attach the capacitor and leads assembly to the motor bracket with the screw and lock washer Make sure a good electrical ground connection is made at this point 3 Insert this assembly into the blower housing and position it so the long screw is in alignment with the gap on the inner ring of the motor bracket assembly This is the screw used to secure and align the motor in the bracket 4 Slide the flat washer and rubber washer into position b
65. ort 99M90 21 40 01 Page v Rev New Issued May 9 2012 l Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES INTENTIONALLY LEFT BLANK 99M90 21 40 01 Page vi Issued May 9 2012 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES Record of Revisions Revision Issue ee oe tee a ee Inserted Letter Date Revised ee oe tee a ee Date By 5 09 12 All pages Original Issue 99M90 21 40 01 Page vii Rev New Issued May 9 2012 HARTZELL l Series Combustion Heater ENGINE TECHNOLOGIES SS Ee ae Owners Manual Record of Revisions Revision Issue Page Inserted Letter Date Revised Description Date By 21 40 01 99M90 Page viii Issued May 9 2012 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES Record of Temporary Revisions Temporary Page Issue B Date B Rev Letter Number Date y Removed y 99M90 21 40 01 Page ix Rev New Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual A Record of Temporary Revisions Temporary Page Issue B Date B Rev Letter Number Date y Removed y 21 40 01 99M90 Page x Issued May 9 2012 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES Service Publication List Pub Number Description Heater Affected 99M90 21 40 01 Page xi Rev New Issued May 9 2012 HARTZELL I Serie
66. otorcraft AFM POH maintenance manual or service publications prior to beginning these activities 21 40 01 99M90 Page 1 2 Issued May 9 2012 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES ar 1 2 Howto use the manual A Refer to this Owner Manual in it s entirety before operation or maintenance Use Maintenance Chapter 8 for basic servicing of the Combustion Heater B Refer to Troubleshooting Chapter 3 prior to starting work to assure that the condition lies with the heater or heater component C If you need to identify a part or find a part number refer to the Illustrated Parts Catalog IPC which has an Introduction Chapter describing the procedure The IPC may be found in the Combustion Heater Overhaul amp Maintenance manual HET P N 99M91 as applicable to your heater If your particular part number heater is not found in these manuals it may be available in another HET or in aircraft manufacturers documents D Along with aircraft documents specific to the heater it is imperative that you read understand this manual and observe all the applicable WARNINGS and CAUTIONS before you perform any work or operations E Test the heater per the test procedures in the manual prior to running the aircraft Utilize the aircraft manufacturers AFM POH and other service manuals and related publications before returning the aircraft to service F All inquires concerning this or other HET m
67. peration cont d The Electric Fuel Pump Aviation Gasoline Applications See Figure 2 3 For aviation gasoline applications the electric fuel pump provides fuel pressure for ground operation and during flight The heater may be operated from the engine fuel pump provided the fuel pressure output is controlled within the operating pressure range of the heater Two 2 fuel pumps working in series can be used where a single pump is not able to provide sufficient fuel pressure Aviation Kerosene Fuel Applications See Figure 2 4 The electric fuel pump assembly is ideally suited for use when needed in aircraft heater fuel systems to provide proper pressures from the fuel source This is accomplished through a fuel control system and on to the heater fuel nozzle Pump supply is adequate for use with all kerosene burning heaters in the HET line and can be mounted in a horizontal position or vertically mounted provided the motor end of pump is at the top Installation note regardless of mounting position an appropriate drain connection should be selected in the adapter section between motor and pump so as to drain fuel in the event of pump seal leakage The drain normally extends through bottom of aircraft clearing outer skin or other parts of the aircraft It should be scarfed at an angle approximately 30 to the direction of flight so as to create a negative pressure on the end of the drain A fuel pressure relief valve must be used whe
68. regarding the recommended maintenance including that called out in Chapter 5 Checks These requirements are needed to assure reliable and safe operation of the heater while in service Maintenance times are listed in hours time in service TIS or calender time which ever is applicable Heater time in service is calculated as one 1 heater hour for every two 2 flight hours or if an hour meter is used on the heater the actual heater time never use both Some maintenance is one time initial and others are recurring Maintenance activities in this chapter may require cleaning as called out in Chapter 4 or testing which is called out in Chapter 6 These maintenance instructions apply to the basic heater and components while the heater is installed in the aircraft Instructions for removal of some components are included provided the installation permits accessibility With the exception of the pressure decay test no special tools are required for normal periodic maintenance of HET aircraft combustion heaters Maintenance indicated under the Periodic Inspection will require use of this manual and or P N 99M91 Overhaul 8 Maintenance manual accomplished by properly licensed mechanics or repairmen experienced in aircraft rotorcraft heating systems Part numbers are not given in this manual for these consult the IPC Chapter of P N 99M91 Overhaul amp Maintenance manual To perform the hourly or calender time periodic check for detailed inspection
69. rence the aircraft or rotorcraft AFM or POH as well as the applicable service or maintenance manual to assure proper heater operation Prior to effecting any repair or using the heater troubleshooting tables herein general aircraft rotorcraft components should be checked to determine if fault lies in system or component other than the heater Check the aircraft rotorcraft heater control or monitoring system Most aircraft rotorcraft will have controls to operate the heater beyond the original heater design These controls can be very simple or can be a complex monitoring system with multiple duct sensors and switches Complex systems are almost exclusively designed by the aircraft rotorcraft design holder and while they work well with the original heater designs If you experience temperature regulation problems consult the aircraft rotorcraft service or maintenance manuals to troubleshoot their systems 99M90 21 40 01 Page 3 1 Rev New Issued May 9 2012 La HARTZELL ENGINE TECHNOLOGIES 99M90 3 1 Procedure Prior to Repair cont d Check the aircraft rotorcraft fuel supply and supply lines Heater fuel pump and heater installations vary greatly from airframe to airframe The distance and geometry of the supply lines can affect the ability to supply fuel to the heater Twists and turns as well as corrosion in the supply lines over time may cause restrictions Contaminated or stagnant fuel may cause difficulty in starts This
70. rol switches or the master switch is de energized The fuel nozzle is located near the fuel shutoff point thus providing a no drool feature Combustion Air Pressure Switch This switch is mounted on the combustion air inlet tube of the heater to sense combustion air differential pressure across the heater The differential pressure is the difference between pressure of combustion air coming into the heater and pressure at the exhaust outlet of the heater If combustion air flow drops below a predetermined setting this switch prevents heater operation Cycling Switch This switch is mounted on the heater in the ventilating air stream Opening of the switch de energizes the solenoid valve controlling fuel flow to the heater The switch closes on temperature drop causing the fuel valve to open thus restarting the heater Over Temperature Switch This may be a manual reset type switch or an automatic reset switch either are mounted on the heater jacket to sense outlet temperature in the ventilating air stream Duct Switch This switch is installed in the ventilating air duct downstream from the heater to sense the ventilating air outlet temperature The duct switch temperature and location are normally controlled by the aircraft or rotorcraft design holder 21 40 01 99M90 Page 2 4 Issued May 9 2012 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES SRA DESCRIPTION 2 1 Component Operation
71. s Combustion Heater ENGINE TECHNOLOGIES Owners Manual q Service Publication List Pub Number Description Heater Affected 21 40 01 99M90 Page xii Issued May 9 2012 Rev New I Series Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES _ MONTGOMERY ALABAMA USA List of Effective Pages Content of Pages Page Date of Latest Revision Title Page i 5 09 12 Copyright statement ii 5 09 12 Table of Contents iii amp iv 5 09 12 Warning Letter v 8 vi 5 09 12 Record of Revisions vii 8 viii 5 09 12 Temporary Record of Revisions ix amp X 5 09 12 Service Publication List xi xii 5 09 12 List of Effective Pages xiii amp xiv 5 09 12 List of Illustrations xv amp xvi 5 09 12 List of Tables xvii xviii 5 09 12 Airworthiness Limitations A 1 A 2 5 09 12 Introduction 1 1 thru 1 8 5 09 12 Description of Operation 2 1 thru 2 6 5 09 12 Troubleshooting 3 1 thru 3 6 5 09 12 Cleaning 4 1 thru 4 4 5 09 12 Check 5 1 thru 5 4 5 09 12 Testing 6 1 thru 6 6 5 09 12 Special Tools 7 1 thru 7 4 5 09 12 Maintenance 8 1 thru 8 14 5 09 12 99M90 21 40 01 Page xiii Rev New Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual ee T eS List of Effective Pages Content of Pages Page Date of Latest Revision Reserved 21 40 01 99M90 Page xiv Issued May 9 2012 Rev New l Series Combustion Heater Owners Manual Figure Figure Figure Figure Figure F
72. s Combustion Heater Owners Manual HARTZELL ENGINE TECHNOLOGIES ee MONTGOMERY ALABAMA USA 1 4 Model Identification Example FR D 34D51 IS FR indicates Factory Rebuilt and will precede the part number if applicable D if applicable means a variation in the developed part number 34D51 is the developed part number for the heater assembly IS indicates Inconel Spec tube and will come after the part number 1 5 Serial number Identification 99M90 Rev New HET mfg by H A 11 07 0001 Location Built i Year Code Month Code Serial Code Example above S N HA11070001 Built in Alabama in 2011 July first unit of the month Hartzell Engine Technologies HET Heater units 21 40 01 Page 1 5 Issued May 9 2012 HARTZELL ENGINE TECHNOLOGIES Se A 1 6 Model number Identification MODEL I 1500 Part No Part No 99C 42 IS 96C60 IS MODEL I 2500 Part No Part No 20D35 1 IS B37D88 IS 42D79 1 IS MODEL I 3500 Part No Part No 07E02 1 IS 37D77 1 1 10E21 4 IS C39D59 I 22D25 1 IS C34D51 IS D34D51 IS E34D51 IS D39D59 45D70 2 I 47D65 3 62D95 1B IS A A S S S S S YA yA MODEL I 5000 Part No 23E62 1 I Part No 07E94 1 IS 07E94 2 IS 23E62 2 13E55 1 IS 39D90 1 13E55 2 IS 65D79 3 IS 19E69 1 IS 81D94 3 IS 88D81 2 IS S S S l Series Combustion Heater Owners Manual P
73. stion air blower and remove the blower motor assembly It will usually be possible to remove the assembly by loosening the clamp and sliding the motor out of the clamp In some installations it is easier to remove blower and mounting bracket from the aircraft B Brush removal amp Installation 1 Remove the brush cap at one of the brush locations Note position of brush inside the guide and carefully lift the brush and brush spring out of the guide Be sure to note the brush orientation in the guide so that it can be re installed in the same position if inspection of the brush shows replacement is not required On Motor Part No s 27D39 and 34D30 it is necessary to remove motor case to replace brushes Inspect the brush for wear If brushes are worn to a length of 3 16 or less they must be replaced If this limit has not been reached the brushes may be reinstalled in the orientation noted in step 1 Looking through the brush guide inspect the commutator which should be smooth and medium brown to dark brown in color Remove all dust from commutator with compressed air If the commutator is grooved in the brush track gouged scored or shows signs of having burned spots replace the complete motor assembly If the commutator is in good condition install new motor brushes and tighten brush caps into place Make sure each brush is oriented so that the curved end fits the curvature of the commutator Install brushes in the reverse order o
74. the combustion air blower duct switch fuel regulator and shutoff valve and fuel pump are combined into one assembly to facilitate installation and service operations The optional equipment items are provided as separate components since they may be mounted at different locations in the aircraft The basic heater assembly consists of the exhaust outlet jacket combustion head and combustion tube The combustion tube is made of Inconel alloy steel with most other parts made of stainless steel alloy Fig 2 1 Cutaway of Typical I Series Heater 99M90 21 40 01 Page 2 1 Rev New Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual Se DESCRIPTION 2 1 Component Operation Spark Spray Ignition The controlled atomized spray from a specially designed spray nozzle coupled with high voltage spark plug ignition ensures instant firing and continuous burning under all flight conditions Spark spray ignition combined with the exclusive HET whirling flame combustion has been proved by millions of hours of heater operation in all types of aircraft throughout the world Heat is produced by burning a fuel air mixture in the combustion chamber of the heater Aviation fuel is injected into the combustion chamber through the spray nozzle The resulting cone shaped fuel spray mixes with combustion air and is ignited by a spark from the spark plug Electric current for ignition is supplied by an ignition unit
75. ulate and run into the airframe especially when using mineral spirits Place shop towels below the heater to absorb any residue while cleaning If removed initial cleaning should be done using a shop cloth and mineral sprits or isopropyl alcohol Wipe dry using clean shop cloths 4 4 General Component Cleaning NOTE If components other than the air blowers or spark plug are removed and need cleaning refer to the HET Combustion Heater Overhaul amp Maintenance manual P N 99M91 for more detailed cleaning and repair information Components separated during disassembly may be cleaned in several ways Aluminum components Use of degreaser or solvents should be used by spray or wiping however dipping or immersion may be used if attended Aluminum may degrade if left in degreasers or solvents for extended periods of time Consult the directions for the agent being used Metallic components Most metallic components may be dipped or immersed for cleaning including combustion tube Use a dry cleaning solvent such as Stoddard solvent Federal Specification P S 661 Mechanical means such as bead blast may be used however it is not advised on most of the heater parts as they may become misshapen Sand blasting is not approved Great care must be taken with the motor armature or armature housing cleaning Aggressive cleaning may fracture the coating on wire or delicate connections Use mineral spirits or isopropyl alcohol for cleaning Blow dryi
76. ution is taken in the design and manufacture of a heater as well as the installation maladies have and will occur It is essential that the heater be properly operated per the airplane flight manual or pilots operating hand book and maintained according to recommended service procedures found herein and in the applicable aircraft service or maintenance manual The heater must be observed closely in inspection and operation to detect any potential problems before they have a chance to become serious Any abnormal or unusual operating reports should be investigated and repairs effected as it may be a warning of impending failure The heater is relied on to provide a comfortable and safe environment for the pilot and passengers It is critical due to the fact that heat is supplied via fuel combustion and air flow which if uncontained may result in smoke and fire aboard the aircraft Without the continuous care and maintenance called for in this Manual the heater will degrade and become unreliable and unsafe Owners operators and mechanics should read and understand this Manual It contains the necessary information about your new heater to assure safe and long lasting operation Please be certain to give it your undivided attention Thank you for choosing a Hartzell Engine Technologies LLC Combustion Heater Maintained properly it will give you safe and reliable service for many years to come Sincerely Hartzell Engine Technologies Product Supp
77. vered with your unit for specific terms and conditions should a warranty condition occur If needed for reference obtain the most current policy from the authorized HET distributor nearest you or visit our website at http www hartzellenginetech com 99M90 21 40 01 Page 1 7 Rev New Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual INTENTIONALLY LEFT BLANK 21 40 01 99M90 Page 1 8 Issued May 9 2012 Rev New I Series Combustion Heater HARTZELL Owners Manual ENGINE TECHNOLOGIES A ____ _ aa Chapter 2 DESCRIPTION OF OPERATION DESCRIPTION 2 0 General A The cabin heater is designed to provide fresh conditioned heated air from outside the aircraft to warm the crew and passenger areas during any phase of flight In addition the heater is designed to maintain a desired cabin temperature within the limitations of the given heater A typical I Series heater is shown in cutaway in Figure 2 1 B Each heater system consists of a heater assembly a ventilating air blower a combustion air blower nozzle holder solenoid valve assembly single piece spark plug high voltage ignition system combustion air pressure switch overheat switch cycling switch and necessary radio noise suppressors Optional equipment includes a duct switch fuel pump fuel regulator and shutoff valve combustion air blower inlet adapter and a fanning strip electrical connectors All components except
78. you must refer to Chapter 5 Checks in this manual The start of any maintenance in this chapter unless a specific anomaly has been diagnosed should begin with a preflight and or daily inspection at which general condition of the heater is recorded This inspection is found in Chapter 5 Checks If performing an annual inspection it should be noted that the first to occur is the TIS requirement which may come prior to or after annual inspection calender time occurs NOTE Prior to any maintenance or testing activity refer to Chapter 3 Troubleshooting in order to determine the condition and the best procedure to follow in correcting the anomaly Most of the maintenance activity items will require that the heater be operationally checked upon completion of the item For this check refer to the applicable aircraft POH or AFM to obtain detailed instructions 21 40 01 Page 8 1 Issued May 9 2012 HARTZELL I Series Combustion Heater ENGINE TECHNOLOGIES Owners Manual 8 1 Bi annual Maintenance The heating system should be inspected at regular intervals the frequency of which should be determined by the type of service and the conditions under which the aircraft or rotorcraft is operated It is recommended that in addition to the periodic inspection requirements inspection maintenance should be made at least twice a year preferably to coincide with the onset of cold weather and warm weather Include the followi

- Hartzell Engine Technologies

Contents

Download Pdf Manuals

Related Search

Related Contents