夏延飞机维护手册 Cheyenne IIIA PA-42-720 AMM 2(141)

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NOTE: The test gauge could require tapping to reduce frictional errors.
(5.) Turn valve toward line; turn handle clockwise again to attain high pressure of 33 psi. Comparetest gauge readingswithfuel gauge readings. Adjust fuel gauge, as necessary, by turning high calibration screwlocatedon rear of instrument.
(6.) Turn handle counterclockwiseforlow pressure of 15 psi. Compare testgauge readings with fuel gauge reading. Adjust fuel gauge, asnecessary,by turning low calibration screw locatedon rear of instrument.
(7.) Repeat steps (5.) and (6.) until no further adjustments are required. (8.) Calibrate fuel pressure accordingto values and tolerancesin Chart 1. Replace gaugeif toleranceis not met. (9.) After calibration, turnvalve to its neutral position(perpendicular
to line). Disconnect tester. (10.)Reconnect disconnected.
any line previously
EFFECTIVITY:
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PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

A. Indicating(continued)
2. FuelFlowIndicatingSystem (continued)
CHART1 FUELSYSTEMCALIBRATIONDATA 
PSI  TOLERANCE 
0 5 10 13 20 25 30 33 40 45 50  0 psito 15psi =+ 2 psi 16 psito 50psi = + 5 psi 

EFFECTIVITY:

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73-30-00Jan
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PIPERAIRCRAFT PA-42-720 (Advanced Trainer) MAINTENANCEMANUAL 
CHAPTER 74 
LIST OF EFFECTIVE PAGES 
CHAPTER SECTION  PAGE  DATE  CHAPTER SECTION  PAGE  DATE 
74-EFFECTIVITY  1  Jan 10/90 

74-CONTENTS

74-00-00

11

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Jan 10/90

74-10-00  1  Jan 10/90 
74-10-00  2  Jan 10/90 
74-20-00  1  Jan 10/90 
74-20-00  2  Jan 10/90 
74-20-00  3  Jan 10/90 
74-20-00  4  Jan 10/90 

LIST OF EFFECTIVE PAGESJan,

SUBJECT
Ignition Description and Operation
ElectricalPower Supply

Ignition Exciter Replacement

CheckingIgnition System

Dry Motoring Run

Distribution
Igniter Plugs Removalof Igniter Plugs Installationof Igniter Plugs Inspectionof Igniter Plugs Cleaning of Igniter Plugs
IgnitionCables Removalof Ignition Cables Installationof Ignition Cables Inspectionof Ignition Cables Cleaning of Inspection Cables
Auto Ignition System Testof Ignition System
PIPERAIRCRAFT PA-42-720(AdvancedTrainer) MAINTENANCEMANUAL 
CHAPTER74 -IGNITION 
TABLE OF CONTENTS 
CHAPTER  PAGE 
74-00-00 
74-10-00 74-20-00  1 1 1 2 2 1 1 1 1 1 2 3 3 3 3 3 4 4 

EFFECTIVITY:
040-999
CONTENTS
PAGE 1
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)

MAINTENANCEMANUAL

Ignition
A. DescriptionandOperation
The spark ignitionsystemconsistsof an ignition excitermountedon aft engine mountassembly,two
high tension cableassemblies,andtwo sparkigniters. The exciter is a sealed unitconsistingof electroniccomponentsencased by an epoxyresin. Whenenergized,a capacitor in the unit is progressivelychargeduntil it reaches a predetermined value, when the energy storedis sufficient to ionize a spark gap in the unit anddischargethe capacitor acrosstwo sparkigniters. The designof the systempermitsoperationof one sparkigniterif the otherstops functioning.
The high tensioncableassembliescarry an electricalchargefrom ignition exciter to sparkigniters. Thecablesconsistof an electrical leadcontainedin a flexible metal braiding,withcouplingnuts on each end and mountingflangesfor attachment to engine fire seals.
Thesparkignitersarelocated at the 4 and 9 o'clock positionson the gasgeneratorcase adjacent to fuel manifold.The ignitersareenergizedduring engine startingsequenceand during auto modewhen torquefallsbelow 400 foot-poundsto initiatecombustionin combustionchamber.
EFFECTIVITY:

74-00-00Jan10/90
74-00-00 Jan 10/90

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL

A. ElectricalPower Supply
~WARNING:  HIGH. USE EXTREME
VOLTAGE IN IGNITION EXCITER CAN BE DANGEROUSLY CAUTION WHEN WORKING AROUND THIS SYSTEM. ENSURE IGNITION IS SWITCHED OFF AND SYSTEM IS INOPERATIVE FOR AT LEAST SIX MINUTES, BEFOREREMOVING IGNITION COMPONENTS. ALWAYS USE INSULATED TOOLS TO REMOVE CABLE COUPLING NUTS. DO NOT TOUCH OUTPUT CONNECTORS OR COUPLING NUTS WITH BARE HANDS. ALWAYS DISCONNECT COUPLING NUTSAT IGNITION EXCITER END FIRST.
CAUTION: DO NOT ALLOW LUBRICANT TO CONTACT CONDUCTOROF CONNECTORS WHICH COULD RESULT IN HIGH RESISTANCEPATH, GENERATING HEAT AND OXIDATION.
NOTE:  Refer to Pratt and WhitneyMaintenanceManual, p/n 3034342, Chapter 74 for additional informationon the ignition system.
1. IgnitionExciter Replacement
　
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