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receiverto 121.5 mHz. Deactivatesquelchandturnup volume until slight backgroundnoiseisheard.
NOTE: If the aircraft is not fitted with a communications receiver,request that the tower listen for yourtest.
(b) Set the pilot's remoteswitchto ON and hold switch in this position for a few seconds.
NOTE: The test transmissionmust be pickedup by the aircraft communications orreceiver
controltower.During cold weather,therecouldbe a slight delay beforetransmission
occurs.

(c) Setthepilot'sremoteswitchto ON for one second; selectARM position.
EMERGENCY
LOCATOR
TRANSMITTER

ANTENNA
GBA
I

ELT ANTENNA ELTARM SWITCH
A327 I REMOTE
WHT/BLU-

I
AFTPRESSURE BULHEAD
EmergencyLocatorTransmitterSchematic 
Figure 501 
EFFECTIVITY: 
040-999 
Jan10/9025-60-00 

PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

A. Emergency(continued)
6. InadvertentActivation
CAUTION: Undernormalconditions,the pilot'sremoteswitchmust be set to ARM position.
In the eventthe ELT is inadvertently activated,set the pilot's remote switchto ON, then return it to ARM position.
that the ELTbe replaced followinginadvertentactivation.However,theproblemmaynot be in the transmitter.Checkthe following: As a routine precaution,it is recommended at the earliestchance
(a)
Properspacingof antennas to minimize antennaconductedRF.

(b)
Rigidityof the transmitter installation.

EFFECTIVITY: 040-999
Jan 10/90
25-60-00 PAGE 5
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

A. Accessory Compartments
The avionics shelvesareinstalled in the nose of the airplane inthe accessory compartment,and providemountingfacilitiesfor avionics andelectricalequipment.LocatedbetweenF.S.24.60andF.S. 57.00,theseshelvesare made of 2024-T3aluminum,angles,brackets,andclips.
A protective blanket, installed inthe avionics bay,reducesthe possibility ofdamageto the avionics
equipmentcausedbywaterleakage. The blanketis installed usingsixinch segments of trim strip.
InverterMonitor Assembly
VIEW
LOOKING
AFT

VHFComm#1 -
VHF Comm #2
Radio Altimeter -
Transmitter

Radio Altimeter -
Receiver

Transponder #2 PRESSUREBULKHEADSTA. 57.0
Avionics Bay Feed Through Identificiations Figure401
EFFECTIVITY:
040-999
25-70-00PAGE 1
Jan 10/90

PIPERAIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL

A. AccessoryCompartments(continued)
-VIEWB
VIEW C -
Pitch
Servo

TOP VIEW LOOKINGDOWN 
VIEW  VIEWD 
VIEW 
VIEW C VIEW E  Trim Servo  _ Pitch Servo Yaw Servo  CockpitVoice Recorder 
LEFT,SIDEVIEW 
Electricaland Electronic Equipment Locations Figure 402 (Sheet 1 of 4) 
25-70-00Jan 10/90 25-70-00  EFFECTIVITY: 040-999 

PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

A. AccessoryCompartments(continued)
VIEW A  Left Stall Computer  Right Stall Computer  Autofeather Computer  Lighting Inverter Assembly 
0  0  Lighting 
Left Ignition Sensor  RightIgnition Sensor 
Dimmer Control Assembly  Leftand RightPilotHeat Sensors  LeftandRightStall Warning CurrentSensors 
a 

Electricaland ElectronicEquipmentLocations
Figure 402 (Sheet2 of 4)

EFFECTIVITY: 040-999
PAGE
25-70-00

Jan 10/90 3
PIPER AIRCRAFT
PA-42-720 (Advanced Tralner)
MAINTENANCEMANUAL

A. AccessoryCompartments(continued)
VIEW B

Leftand Right WindshieldHeat
Timers
Leftand Right Jet Pump DisengageRelays

Left andRight Start Flap Warning Relay
Gear Warning Relay
FlapControlAmplifier

Left and Right Fuel
Pump Relays

DeiceTimer

LandingLight Solonold
Taxi Light Solonoid 
Left Windshield Heat Contactor 
Electricaland Electronic EquipmentLocations Figure402 (Sheet 3 of 4) 
EFFECTIVITY: 040-999 

Jan10/9025-70-00
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

A. Accessory Compartments (continued)
VIEW C
Avionics 1 and 2 Relays
VIEW D
Left and Right
StallWarning

VIEW E CurrentSensors
and Horn

Fuel FlowSignal
Conditioner

ElectricalandElectronicEquipmentLocations
Figure402 (Sheet4 of 4)

EFFECTIVITY:
040-999
25-70-00PAGE5
Jan 10/90
　
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