Jan 10/90 73-30-00
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:
040-999
73-30-00Jan
10/90
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
Jan 10/90
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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