Landing Gear Extension System Fails To Operate - Piper PA-44-180 SEMINOLE Maintenance Manual

CHART 2902. TROUBLESHOOTING HYDRAULIC SYSTEM (cont.)
Trouble
Landing gear extension system
fails to operate.
If the extension solenoid of the pump can be heard to actuate
when operating the gear selector switch, it may be assumed that
the gear control circuit is operating properly and the actuator cir-
cuit should be further checked.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Cause
Landing gear actuator circuit
breaker open.
Landing gear selector circuit
breaker open.
Landing gear actuator circuit
wires broken.
Landing gear selector circuit
wires broken.
Pump extension o u t b o a r d
s o l enoid inoperative.
— NOTE —
Gear selector switch ground
incomplete.
Gear selector switch inoperative.
Hydraulic pump
i n c o mplete.
Hydraulic pump inoperative.
Hydraulic fluid in reservoir
below operating level.
Low or dead battery.
2C2
R e s e t c i r c u i t b r e a k e r and
d e t e rmine cause for open circuit
breaker.
Reset circuit breaker and
d e t e rmine cause for open circuit
breaker.
Check wiring.
Check wiring.
Replace solenoid.
Check ground.
Replace switch.
ground Check ground.
Replace or overhaul pump.
Fill reservoir with hydraulic
fluid.
Check condition of battery.
Remedy
29-02-00
Page 29-07
Revised: June 20, 1995