LIST PAGE1
EFFECTIVEOF
LIST OF EFFECTIVE 10/90
PAGESJan
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
CHAPTER 24 -ELECTRICAL POWER
TABLE OF CONTENTS
SUBJECT CHAPTER PAGE
24-00-00
General 1
24-30-00
DC Generation 1 Description and Operation of Starter Generator System 2 Fault Isolation (Starter Generator) Maintenance Practices 5 Removalof Starter Generator 5 Installation of Starter Generator 5 Adjustments of Starter Generator 6 Starter Generator Service Test Specifications 7 Check Starter Generator System 8 Generator Brush Inspection 8 CleaningGenerator (Assembled) 11 Description and Operation of Generator Control Unit 12 Removalof Generator Control Unit 12 Installationof Generator Control Unit 12 Checking Generator Control Unit 12 Removal of Cross Start Relays 13 Installationof Cross Start Relays 13 Descriptionand Operation of Battery 13 Fault Isolation (Battery) 14 ChargingBattery 19 ConstantCurrent Charging 19 Constant Potential Charging 19 Battery Cell Replacement 20 Removalof Battery 21 Installationof Battery 21 Testing Battery TemperatureSensor 22 Adjustmentof Electrolyte Level 22 BatteryInspection 22 Battery Disconnect and ReceptacleInspection 23 Periodic Battery Check 23 Cell Voltage Check 23 BatteryCleaning 24 OverheadMeter and Switch Panel Assembly 25 Removalof Engine Control Panel Switch 25 Installationof Engine Control Panel Switch 25 Removalof Rocker Switch 25 Installationof Rocker Switch 25 Removalof Electrical Gauge 25 Installationof Electrical Gauge 25
EFFECTIVITY: 040-999
CONTENTSPAGE 1
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
CHAPTER24 -ELECTRICALPOWER
TABLEOF CONTENTS(continued)
SUBJECT CHAPTER PAGE
24-60-00
DC ElectricalLoad Distribution 1 MainCircuitBreakerPanel 1 Removalof Main CircuitBreakers 1 Installationof Main Circuit Breakers 1 ElectricalPower DistributionSystemTest 2 MainBusTie Circuit BreakerandCrossfeedDiodeCheck 4 Left and RightCircuitBreakerPanels 5 Removalof Plug-in TypeCircuitBreakers 6 Installationof Plug-inTypeCircuitBreakers 6 Removalof ScrewConnectType Circuit Breakers 6 Installationof Screw ConnectType Circuit Breakers 6
EFFECTIVITY:
040-999
CONTENTS
PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
ElectricalPower
A. Descriptionand Operation
Electricalpoweris supplied by a 28-volt, directcurrent,negativegroundelectrical system incorporating a 24-volt nickel-cadmiumbattery furnishing powerforstarting,and as a reserve power source in case of generator failure. An external power receptacle is also providedin the nose of the airplane for auxiliarypowerduringcold weather operationsor whenever externalpoweris required to start the engines.
The electricalsystem is controlled by three rockertype switches: the battery masterswitch,right startergeneratorswitch, and left starter generator switch. Theseswitches are located on an overhead paneljust above the windshield betweenthe pilot and copilot seats. The battery masterswitch controls a master contactor whichconnectsthe battery to the tie bus. Both generators providepower to this bus and can be switched individually on or off the system.
The PA-42-720has two 300-amp, 28-voltgenerators,whichprovide the startingfunctionfor the engines. Overvoltage and overloadprotectionis provided withinthe system, with two circuit breaker panelslocatedon the right and left side panels of the cockpit.
EFFECTIVITY:
24-00-00
Jan 10/90
PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. DCGeneration
CAUTION: THE SELECTOR SWITCH SHOULD NOT BE LEFT IN THE START POSITION ANY LONGER THAN THE TIME REQUIRED FOR A NORMAL ENGINE START; OTHERWISE, THE UNIT MAY BE DAMAGED BY EXCESSIVE TEMPERATURES CAUSED BY THE LARGE STARTING CURRENTS IF A NORMAL START IS NOT EFFECTED.
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