E-1900 - Avia Propeller
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1. yr Po p ELN ATA 61 20 99 E 1900 Operation and Installation Manual Synchrophasing System for Turboprop and Piston Engines APS W The technical content of this document is approved under authority of DOA No EASA 21J 072 Issue 3 April 22 2015 ATA 61 20 A ELN www aviapropeller com Warning People who fly should recognize that various types of risks are involved and they should take all precautions to minimize them since they can not be eliminated entirely The governor is a vital component of the aircraft A mechanical failure could cause a forced landing Governors are subject to constant vibration stresses from the engine Before a governor is certified as being safe to operate on an airplane engine an adequate margin of safety must be demonstrated Even though every precaution is taken in the design and manufacture of a governor history has revealed rare instances of failures particularly of the fatigue type It is essential that the governor be properly maintained according to the recommended service procedures and a close watch be exercised to detect impending problems before they become serious Unusual operation characteristics should be investigated and repaired as it could be a warning that something serious is wrong The governor is among the most reliable components of your airplane It therefore deserves the care and maintenance called for in this Manual Please give it your attenti2. o o 4 e N y y tO O Fig 2 Synchrophasing control unit A213796 Issue 2 Page 4 2014 03 16 ATA 61 20 4 0 4 1 Synchrophasing control coil line Propeller speed signal Page 5 y nat www aviapropeller com DESIGN AND OPERATION INFORMATION Design information The Avia Propeller synchrophasing system continuously monitors and maintains propeller synchronization and phasing The wiring harness links the synchrophaser controller to the propeller governors Fig 3 Synchrophasing system diagram When turn on the synchrophasing system the controller energizes each governor with a 28 Volt pulse train signal analyzes the phase relationship between the left and right propeller governor speed signals and regulates the continuous variable sguare wave 28 Volt pulse train signal to each governor in order to control governor output and achieve propeller synchronization and phase control When one propeller speeds up the controller detects the phase angle of one governor channel advancing relative to the other In order to maintain synchronization between propellers the controller decreases the period of the sguare wave signal to the governor of the advancing propeller and increasing the period of the sguare wave signal to the governor of the lagging propeller The advancing propeller slows while the lagging propeller speeds up until both propellers return to the synchronized state The two 28 Volt sq
3. 7 O Phasing control 0 to 50 kQ variable Table 1 Synchrophaser System Wiring Check 3 If faults are discovered use the information in the chart in Fig 6 to correct the problem TROUBLESHOOTING A If the synchrophaser system initially works but occasionally loses synchronization or the engine speed surges or hunts or the system is marginally stable and does not achieve the specified synchronization split the governor may not be calibrated correctly Check the governor rpm gain by the Avia Propeller governor test and adjustment procedures B If the synchrophaser circuit breaker trips there is a short in the power lead Check the wiring by System Wiring Check procedures C If the synchrophaser system is inoperative Check for broken or chafed wires in the synchrophaser wiring harness from the governor to the engine firewall Check the synchrophaser wiring harness plug for loose wires and check the control box plug receptacle for loose bent or damaged pins Check to see the system is getting power by following the System Wiring Check procedures Check the governor speed pick up and control coil for each engine by the Avia Propeller governor test and adjustment procedures Check the phasing control by following the System wiring Check procedures D After completion of troubleshooting procedures perform an operational check of the synchrophaser system E If the system remains inoperative after sat
4. d 3 Synchronize the propellers manually within 25 rpm using pitch control 4 Turn the synchrophaser switch to the ON position 5 If propellers do not rise to an equal speed refer to the troubleshooting section to evaluate the problem C SYSTEM FLIGHT CHECK 1 Set the synchrophaser switch OFF 2 After reaching a safe altitude set engines to cruise power Synchronize the propellers manually within 25 rpm Turn the synchrophaser switch to the ON position If propellers do not rise to an equal speed refer to the troubleshooting section to evaluate the problem 6 Check the synchronization split by advancing the propeller control of one engine until the synchronizing lock is broken The split should be 60 rpm minimum 3 4 5 Page 6 2014 03 16 ATA 61 20 M na www aviapropeller com 5 0 INSTALLATION INSTRUCTION The propeller governors are installed according to respective Installation Manual The synchrophaser box is mounted for example under the aircraft s glove box located on the copilot s side of the cockpit and has a plug receptacle to connect wiring harness see figure below N LAN lt Z screw GLOVE BOX M N washer 2 nut Pe a imt S YNCHROPHASER CONNECTOR SHELL Fig 5 Synchrophaser installation GROUNDING STRAP The wiring harness links the synchrophaser controller to the propeller governors Figure 6 shows electrical interconnec
5. isfactorily completing all troubleshooting procedures replace the synchrophaser box Issue 1 2012 08 31 ATA 61 20 8 0 Page 8 A nat www aviapropeller com SHIPPING AND STORAGE Propeller governor conservation Inner conservation is automatically done by engine oil Attach cover cap After installing the governor the conservation is done together with engine in accordance with the instruction of the engine manufacturer Outside conservation isn t reguired Pack the governor in two layers of wax cloth and put it in a plastic bag The plastic bag should be vacuumed and after that welded Make a note in the governor s installation record Deconservation isn t needed Storage Instruments have to be packed in carton box with accessory documentation Store instruments in temperature from 10 C 50 F to 30 C 86 F and relative humidity from 40 to 80 Keep stock room free of gases with deleterious effect 2012 08 31 ATA 61 20 A Popeyes www aviapropeller com 9 SYSTEM INSTALLATION RECORD Left propgovernor P N P SN EW HU NR Right propgovernor P N P NET oI Y R Synchrophaser P N A213796 SINE sisisavetcuenssvcinadegescdens Page 10 2014 03 16
6. on especially the section dealing with Inspections and Checks Thank you for choosing an Avia Propeller governor Properly maintained it will give you many years of reliable service Your Avia Propeller technical support team Page 0 1 2012 08 31 ATA 61 20 y a EW www aviapropeller com Table of contents Page Table of Contents Overview 1 List of inserted revisions NO List of effective pages General Model Designation Performance Data Design and Operation Information Installation Instruction Inspections Troubleshooting Shipping and Storage O o p SN Do m eoo w oa o o o o WN O KR O o a4 System installation record Page 1 2012 08 31 ATA 61 20 List of Inserted Revisions A nat www aviapropeller com No Date of Issue Pages Remark 1 2012 08 31 all Initial Issue 2 2014 03 16 2 4 5 6 7 10 New Synchrophaser introduced 3 2015 04 22 2 5 Update of Fig 3 phase selector removed 4 5 6 List of Effective Pages Page Date of Issue 2012 08 31 2012 08 31 2015 04 22 2012 08 31 2014 03 16 2015 04 22 2014 03 16 2014 03 16 2012 08 31 00 1 on amp co ro 2012 08 31 k o 2014 03 16 Page 2 Issue 3 2015 04 22 ATA 61 20 A i EN www aviapropeller com 1 0 GENERAL 1 1 2 0 Page 3 The APS W sy
7. stem consists of synchrophaser controller synchrophasing propgovernor accessories synchrophasing coils speed sensors wiring harness and cockpit instrumentation The system continuously monitors and maintains propeller synchronization and phasing working in conjunction with Avia Propeller P 8 and P W series synchrophasing propgovernors Statement of purpose This manual provides data required to insure the satisfactory operation maintenance and repair of the Avia Propeller APS W synchrophasing system This manual must be used in conjunction with the applicable basic Aircraft Maintenance Service Manual MODEL DESIGNATION APS WO 1 1 2 3 4 Legend 1 APS Avia Propeller Synchrophasing System 2 W for GE turboprop engines A for Austro Engine L for other piston engines 3 0 basic arrangement 4 Application Number propgovernor used etc S No 11 S 003 a b c a Year of Manufacture b Synchrophasing System c Consecutive Number 2012 08 31 ATA 61 20 a n IP ELN www aviapropeller com 3 0 PERFORMANCE DATA Supply voltage 9 to 36 VDC Normal current draw 3 A at 14 VDC Normal operating freguency 25 to 60 Hz 1500 to 3600 rpm Nominal input pulse amplitude 1 5 to 1 75 Volts peak 3 1 Dimensions Fig 1 Propeller governor with synchrophasing feature for GE H 80 engine a AOR a 31 5 2 5 o oj wo lt r co m wo a a
8. tions between all synchrophasing components speed speed sensor 4 sensor LEFT r RIGHT control N Pr control coil coil GND Il 28VDC breaker aY activation status MSBAEJ EOC GR R MS27499 SYNCHROPHASER CONTROLLER A213796 Fig 6 Synchrophasing Wiring Diagram for A213796 Page 7 2014 03 16 ATA 61 20 6 0 Page 8 A nat www aviapropeller com INSPECTIONS The propeller governors are inspected according to appropriate governor s manuals The synchrophaser controller does not reguire periodic maintenance and there is no component overhaul reguired for controller The ensuing maintenance instructions should be followed to correct a malfunction of the synchrophaser system Refer to the troubleshooting section for guidance System Wiring Check 1 Turn Master Switch OFF pull synchrophaser circuit breaker OUT and disconnect wiring harness from synchrophaser controller 2 Test wiring by connecting an ohmmeter to the wiring harness plug connector pins according to the chart and plug illustration shown in Fig 6 and Table 1 To check Required reading Primary power Supply voltage Master switch ON circuit breaker SET 28 VDC First governor speed pick up 50 to 70 Q Second governor speed pick up 50 to 70 O First governor control coil 28 to 37 O Second governor control coil 28 to 3
9. uare wave signals energize each governor speed control coil to affect the governors control mechanism The Avia Propeller P 8 and P W series governor control mechanism consists of flyweights rotating through a magnetic field created by the governor control coil An increasing or decreasing pulse train signal to the control coil excites the magnetic field which in turn induces a change in the flyweight position The flyweight position affects the pilot valve which regulates the pressure of the oil controlling the propeller blade pitch The mechanism allows precise control of the propeller rotation speed over a limited range of authority Issue 3 2015 04 22 ATA 61 20 y t EN www aviapropeller com ud Fig 4 Phase angle between synchronized propellers The phase shift is established by testing and it is constant 4 2 Operation information A BASIC OPERATION 1 The synchrophaser controller is turned on and off by a switch on the cockpit control panel and operating siatus is shown by an ON OFF indicator lamp 2 To synchronize the propellers set engine power and manually synchronize the propellers within 25 rpm Turn the synchrophaser switch to the ON position B SYSTEM GROUND CHECK 1 Set the synchrophaser switch OFF 2 Set engines to cruise power engine speed then reduce speed by 200 rpm using the pitch control to insure that the governors are controlling engine spee
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