Piper Cheiftan Manditory Service Bulletin
Contents
1. VDC AMP TRACEABILITY WORK PERFORMED REF DATED RNING THIS UFACTURER 30e POST RD PH 269 695 7469 FAX 269 69 AIRCRAFT LUMEUS TION PART NO REV MUDE BITUZHR VDCZAMP APPLICATION REFERENCI THIS HEATER IS FAA PMA APPROVED FOR ELIGIBILITY PLEASE CONTACT US OR IPLIANCE WITH CURRENT e THINE SS SEE WWW AIRCRAF THEATER CHIM iN PZN L21028 REV G DIRECTIVES MAY BE 69 695 7469 FAX 269 695 6004 FOR MORE INFORMATION A C amp D heaters beginning with Rev E and serial number 1875 and up or later revisions are built with modifications exempt from this MSB MSB0001 Rev C amp D ASSOCIATES INC 302 POST RD BUCHANAN MI 49107 PHONE 269 695 7469 FAX 269 695 6004 ACTION Cause of the heaters premature failure has been identified to include design of the aircraft heat distribution and undependable fuel control to the heater C amp D has elected to recall all Piper Chieftain PA 31 350 heater part number CD 14048 1 to be returned to the factory for inspection and modification Modification of the heater will eliminate combustion chamber rupture when the aircraft heating system modification kit CD29151 is installed to improve air flow and stabilize fuel to the heater 1 Prior to the next flight a Complete a pressure decay test2. C amp D ASSOCIATES INC 302 POST RD BUCHANAN MI 49107 PHONE 269 695 7469 FAX 269 695 6004 MANDITORY SERVICE BULLETIN MANDITORY COMPLIANCE REQUIRED Bulletin MSB 0001 Issue Date 02 11 2011 Rev SUBJECT This Mandatory Service Bulletin MSB is issued due to a high percentage of Piper Chieftain PA 31 350 heaters failing Pressure Decay Test PDT from ruptured combustion chambers Inadequate heat distribution for the aircraft cabin and unstable fuel supply to the heater are contributing factors to the premature heater failure AIRWORTHINESS CONCERNS While there have been no accidents or incidents related to any of C amp D Associate s combustion heaters the serious danger presented by premature combustion chamber failure could place the aircraft and passengers in serious danger Any breach of the air tight combustion chamber could provide a passage way into the cabin for fire or carbon monoxide PURPOSE This Mandatory Service Bulletin MSB is issued to require immediate inspection to identify C amp D heaters installed in the Piper Chieftain Model PA 31 350 for further inspection by PDT and arrange for factory modification or replacement The MSB is also to announce the availability of an FAA STC PMA modification kit that incorporates design improvements for fuel supply and heated air distribution problems now existing in the aircraft heating system Installation of the airframe modification will enhance heat distribution in
3. PDT in accordance with C amp D maintenance manual MM10001 1 In the event that the heater fails PDT contact C amp D prior to further operation 1i Heaters that pass PDT will require a PDT test each 50 hours of operation until modification or replacement b Verify that installation instructions IN14048 Rev E dated 2 1 11 attached have been complied with Give special attention to i Combustion air inlet modification Step 2 A 1i Fuel pressure check Step 3 C 11 Upper limit temperature setting Step 3 C 2 2 Contact C amp D with the heater serial number to ensure a timely and orderly modification or replacement a Heaters still under warranty will be given 1 priority Modification will include overhaul to 0 time and cost will be in accordance with C amp D pro rated warranty terms b If the heater is no longer under warranty modification and overhaul to 0 time will be consistent with current pricing 3 Install the heating system modification kit part number CD29151 to ensure proper fuel pressure and provide 30 more heated air distribution into the cabin Pricing warranty Special pricing has been established for heaters modified replaced and the Heating System Modification Kit CD29151 is purchased in compliance with this MSB until August 30 2011 New heater warranty of 4 years 1000 hours will be provided to heaters P N CD14048 1 when returned for 0 time overhaul and the heating system modificatio
4. 107 USA PH 269 695 7469 FX 269 695 6004 WEB www aircraftheater com EMAIL sales aircraftheater com INSTALLATION INSTRUCTIONS IN14048 Page 4 of 4 Effective date 06 08 98 Rev E dated 2 1 11 C amp D ASSOCIATES INC DOCUMENTATION AND PARTS REQUIREMENT TABLE DOCUMENTATION Quantity 1 FAA PMA Supplement 60 _ 2 Label for flight manual 21503 2 3 MM10001 Maintenance Manual OOo 4 Combustion Heater Airworthiness Limitations OoOO 5 Quality Assurance Certificate of Compliance 527 OoOO PARTS S N 1 1 Heater CD14048 1 2 1 Combustion Air Blower 21415 Initials Date For warranty information see website www aircraftheater com 302 POST ROAD BUCHANAN MI 49107 USA PH 269 695 7469 FX 269 695 6004 WEB www aircraftheater com EMAIL sales aircraftheater com
5. TERMINAL STRIP JUMPER WIRE BYPASSING THERMOSTAT SENSOR AIRCRAFT WIRES NOT INSTALLED 302 POST ROAD BUCHANAN MI 49107 USA PH 269 695 7469 FX 269 695 6004 WEB www aircraftheater com EMAIL sales aircraftheater com INSTALLATION INSTRUCTIONS IN14048 Page 3 of 4 Effective date 06 08 98 Rev E dated 2 1 11 C amp D ASSOCIATES INC TO AIRFRAME GROUND CB were A VENTILATING AIR BLOWER 1224VDC P22 a os 20 15 AMP BLUE N NOZZLE E o ow OPTIONAL Mii ge Pa re ita oe OVERHEAT A OE Nese EEO BLACK WARNING N 4 5 5 Be LAMP D A AN SWITCH ROTARY a BLACK CYCLING PIN CD20654 sa ee UA 4 4 SWITCH 3 POLE 12 POSITION maaa a ee aa Z BLUE RED BLUE N p N ia F 3 3 T j ADJUSTABLE RED 24VT GREEN 12VT FUEL N DUCT RED a SOLENOID OPTIONAL SWITCH i 2 2 HOUR METER IGNITION IGNITION 1 1 UNIT LEAD x Va COMBUSTION AIR BLOWER E e a E R E COMBUSTION 2 l n h L a JA n AR SPARK i 2 3 PRESSURE PLUG RED 24 VT ee SWITCH GREEN 12 VT TYPICAL AIRCRAFT CONTROLS OVER HEAT SWITCH BLACK FUEL PUMP AND OR U E a i ASSEMBLED ON HEATER lt lt 4 After installation complete the operation and heat output tests specified in the C amp D Associates Inc MM10001 Maintenance Manual for aircraft combustion heaters dated 1 1 08 Tests should be accomplished in
6. accordance with section IX C operational test and D for heat output steps 1 and 2 Also in accordance with the Instructions for Continued Airworthiness step 1 Preflight Operational check and Shutdown Procedure 5 NOTE Follow the Combustion Heater PREFLIGHT OPERATIONAL CHECK AND SHUTDOWN PROCEDURE outlined within the Combustion Heater Instructions for Continued Airworthiness Second Edition Revision none dated 04 04 02 or later revision included with these instructions This FAA approved Instructions for Continued Airworthiness must be complied with and become a permanent part of the Aircraft Operations and Procedures manual 6 Verify all wires are secure and free of obstruction and chaffing 7 NOTE Janitrol AD96 20 07 Combustion Heater Airworthiness Directive does not apply to the C amp D Associates Inc Combustion Heater 8 NOTE Removal of the Combustion Heater and the installation of the C amp D Associates Products TSO C20 approved heater will have no net effect on weight and balance or electrical load requirements 9 NOTE Insert the attached label 21503 into the aircraft flight manual in the heater operating section Correct equipment list to reflect new C amp D Associates Inc heater and part number 10 NOTE Utilize existing aircraft combustion heater operating instructions or other FAA approved combustion heater operating instructions where applicable 302 POST ROAD BUCHANAN MI 49
7. n kit CD29151 is also purchased for installation in the aircraft Labor Heater removal and reinstallation is estimated at 4 hours or 6 5 hours when the aircraft modification kit CD29151 is also installed Heating system modification kit CD29151 installation is estimated at 2 5 hours with the heater removed 3 MSB0001 Rev INSTALLATION INSTRUCTIONS IN 14048 Page 1 of 4 Effective date 06 08 98 Rev E dated 2 1 11 C amp D ASSOCIATES INC HEATER P N CD14048 1 Piper PA 31 350 READ COMPLETE INSTRUCTIONS BEFORE BEGINNING INSTALLATION Accomplish all wiring in accordance with AC43 13 1B Chapter 11 Electrical Systems Accomplish all plumbing in accordance with AC43 13 1B Chapter 8 Section 2 par 8 31 1 Preparation A Follow the Aircraft Service Manual or other FAA approved source for removal of the existing Combustion Heater B Install the C amp D Associates Inc TSO C20 Approved Combustion Heater utilizing the existing Aircraft Service Manual or other FAA approved source where applicable 2 Combustion Air Inlet Modification A For proper combustion air balance combustion air inlet scoop located forward of where heater exhaust pipe extends out of aircraft needs proper scarf see fig 1 This angle is 15 deg with longer portion of scarf aft Supplied inlet template fig 2 can be cut out and taped around existing inlet transfer angle with a marker Trim and de bur Top of template may or may not reach to airc
8. ny other terminals j LOTR FUEL PRESSURE C Install the fuel pressure gauge 0 15 Tee into as shown Fig 3 ix 4 AN GAUGE 1 With the heater running verify fuel pressure Preferred pressure is E c 0 15 PSI FOR 8psi 6 5psi min 10psi max J AV GAS 2 With the heater running verify that the outlet plenum temp O is approx 250 Adjust the cycling switch 1f needed FROM Clock wise to increase counter clock wise to decrease HEATER gt 1 FUEL PUMP tI HH temperature Fig 5 on l HEATER REGULATOR Figure 3 CONNECTION NOTE Adjust screw no more than 1 4 turn at a time 3 Remove the jumper wire and verify that the temperature is controlled by the aircraft thermostat from low approx 75 F to medium to high approx 250 F which is what the cycling switch is set at 4 Remove the temperature probe If drilled seal the 1 8 hole with high temperature silicone 5 Remove the fuel gauge installed in step 3 C Leave the tee fitting and cap off for future pressure readings if desired If the hoses need to be replaced we recommend Sceet 6 1 1 2 red from the blower to the heater and Ceet 6 1 1 2 black from outside air to the blower For additional information see the maintenance manual MM10001 included with this heater under Testing after installation or overhaul CYCLING SW ADJUSTMENT CYCLING SWITCH Figure 5 Figure 4 P N 21252 h TAAEAR COM Wma Cni NUMBER PLATE
9. raft skin lt lt HEATER COMBUSTION AIR INLET FIGURE 1 lt 4 50 fof I HORIZONTAL TO AIRCRAFT SKINI oe TRIM INLET TO THIS ANGLE WARD FOR 1 000 ol AFT INLET TEMPLATE 15 Scarf FIGURE 2 302 POST ROAD BUCHANAN MI 49107 USA PH 269 695 7469 FX 269 695 6004 WEB www aircraftheater com EMAIL sales aircraftheater com INSTALLATION INSTRUCTIONS IN14048 Page 2 of 4 C amp D ASSOCIATES INC Effective date 06 08 98 Rev E dated 2 1 11 3 HEATER OPERATIONAL TEST AFTER INSTALLATION IMPORTANT Please complete the followings steps after the new heater is installed in the aircraft A Install a temperature probe min 0 500 F in the outlet plenum 6 8 aft of the heater A good location would be approx 6 aft of the heater or near the thermostat sensor Usually you can find a small access point somewhere in the ducting aft of the heater Otherwise it may be necessary to drill a small 1 8 hole through the heat distribution plenum allowing a thermo couple to enter unobstructed into the heated air stream approx 1 CAUTION Never drill into combustion heater itself Verify nothing will be damaged in this process CAUTION Verify thermal couple is not touching plenum internal wall B Place a6 20G jumper wire with 2 small alligator clips or the like across the heater terminal strip numbers 2 and 3 which will bypass the aircraft thermostat Fig 4 CAUTION Be sure not to short a
10. to the cabin by 30 and stabilize fuel to the heater for longer combustion heater life BACKROUND C amp D Associates Inc C amp D has identified problems involving the complete heating system exclusive to the Piper Chieftain Model PA 31 350 Unstable fuel supply to the heater inadequate heated air distribution into the cabin and the heater design are contributing factors to the premature heater failures Two C amp D heaters exclusive to the Piper Chieftain were returned for failing a pressure decay test The heater part number CD14048 1 is FAA PMA approved as direct replacements for the Janitrol part number FR 65D79 1 2 3 EL On inspection it was found that the combustion chambers had ruptured Because of the unusual characteristic of the failure inspection was made of the Chieftain heaters that had been in C amp D s core bank having been exchanged for C amp D heaters Of the 25 Janitrol heaters examined for comparison of the premature failure 13 had combustion tube ruptures Heater combustion chamber failure prior to reaching 1 000 hours of operating time is very rare and normally caused by fuel nozzle contamination Results of this inspection reviled that over 50 of the heaters installed in the Piper Chieftain Model PA 31 350 have failed pressure decay tests PDT due to burned off portions of the flame tube causing premature combustion tube ruptures Two low time examples are pictured here with the end dome removed The pictures sho
11. w burned out sections of the center flame tube This flame tube deterioration then allows the concentrated MSB0001 Rev 302 POST RD BUCHANAN MI 49107 PHONE 269 695 7469 FAX 269 695 6004 C amp D ASSOCIATES INC heat to weaken the sealed chamber wall causing the tube to rupture The first is a C amp D heater with 560 hours time in service The second is a Janitrol factory remanufactured heater with 184 hours time 1n service C amp D Heater Janitrol Heater PRODUCT IDENTIFICATION Includes combustion heaters sold prior to the date of this service bulletin with part number CD14048 1 These heaters are FAA PMA approved to replace the Janitrol part number FR 65D79 1 2 3 EL exclusively installed in the Piper Chieftain model PA 31 350 Affected heaters can be identified by checking the heater data plate Information after the part number see green below left provides the revision level that the heater was built to and then its serial number C amp D Associates Inc manufactured heaters with data plates indicating revisions up through Rev D and a serial number 1874 or lower requires compliance with this SB Those C amp D heaters affected and modified in compliance with this MSB will then have MSB0001 C W clearly see yellow below right indicated on the heater data plate ASSUCIATES v ONC w LGOROIAN
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