PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. ExtensionandRetraction(continued)
4
NOTE: See Following Page For Callouts.
EmergencyExtensionSystemInstallation
Figure 1 (Sheet 1 of 2)
EFFECTIVITY:
Jan10/90 32-30-00
PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. ExtensionandRetraction(continued)
1.
Pump -Engine Driven
2.
Filter
3.
CheckValves
4.
HandPump
5.
SelectorHandle
6.
RestrictorValve
7.
Actuator,Nose Gear
8.
Actuator,Main Gear
9.
Actuator,MainGear Door
10.
PowerPackAssembly
A.
Main Relief Valve
B.
Engine Pump Check Valve
C.
PriorityValve
D.
DoorSolenoidValve
E.
VentValve
F.
TimeDelayCheck Valve
G.
Time Delay Valve
H.
Hand Pump Relief Valve
J.K.M.
Filter
N.
Reservoir
P.
LandingGear Selector Valve
Q.
Selector Valve Detent
R.
SelectorValveSpringReturn
S.
ElectricalSwitch
T.
Electrical Connector
11.
PressurePort Valve
12.
SuctionPort Toggle Valve
13.
HandPumpCheckValve AA. Cylinder BB.ExplosiveValve
CC.Fill Valve DD.BurstDisc EE.Gauge
15.
UnlockActuator
16.
ShuttleValve, Main Gear
17.
ShuttleValve,NoseGear
BOTTLEFILL PRESSURES
FILL PORT -DRY NITROGEN ONLY SEE SERVICE MANUAL FOR INSTRUCTIONS TEMP. -PRESSURE RANGE
F -40 -20 0 +20 +40
PSIG 1585 1560 1735 1815 1890
F +60 +70 +80 +100 +120
PSIG 1960 2000 2035 2110 2185
EmergencyExtensionSystem Installation Figure 1 (Sheet 2 of 2)
EFFECTIVITY: 040-999 32-30-00 PAGE3Jan 10/90
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Extensionand Retraction (continued)
2. FaultIsolation-Extension and Retraction
NOTE: Place airplane on jacks before attempting fault isolation of landing gear system (refer to 7-10-00).
CHART 1 FAULT ISOLATION (EXTENSION AND RETRACTION) (Sheet 1 of 2)
Fault Cause Remedy
Landing gear selector Selector lever cannot be Ensurethatthe LEFT maingear
handle fails to operate movedto the gear up strut is extended and that the
to gear up position. positionwhile the LEFT maingearstrut is com- poweris on.
pressedor with the power
off.
Faulty safety switch on Adjustor replace safety
leftmaingear. switch.
Gear retracts or extends Priorityvalveleaksin Check priority valve
beforethe doors open. powerpack. cracking pressure.
Solenoid valve stuck in Turnoff power and hand
closedposition. pump doors open.
Microswitchon power Check for bent bracketor loose
packout of adjustment. mountingor wire and adjust.
Doors come open in Micro switch on power Adjust micro switch.
flight. pack out of adjustment.
Doors fail to close. Circuit breaker out. Checkcircuitbreaker.
(refer to 32-60-00)
Lightswitchout of Adjustlimit switch.
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