Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 808 / 1956

PAGE 2
Feb 28/07
4E2
32-30-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
CHART 1 (Sheet 2 of 3)
TROUBLESHOOTING LANDING GEAR EXTENSION AND RETRACTION SYSTEMS
Trouble Cause Remedy
Pump stops during gear Hydraulic pump circuit breaker Reset circuit breaker and
retraction / extension. opens. determine cause for
overload.
Pressure switch out of Check bypass circuitry.
adjustment.
Remove and readjust or
replace switch.
Bypass circuitry malfunction Check per Landing Gear
or nose gear extension prior Retraction System .
to main gear extension. Functional Test, below.
Pressure relief valve out Adjust / replace pressure
of adjustment. relief valve.
Mechanical restriction or Place airplane on jacks and
obstruction in hydraulic run extension check.
system to allow pressure Isolate and determine
to build up and shut off cause.
pump before gear has
extended / retracted.
Pump fails to shut off Pressure switch inoperative. Repair / replace switch.
though gear has fully
retracted / extended.
Pressure switch out of Check bypass circuitry.
adjustment.
Adjust switch.
Pump relay sticking. Replace relay.
Hydraulic fluid in reservoir Fill reservoir with hydraulic
below operating level. fluid. Check for leaks.
Pressure relief valve out of Adjust / replace pressure
adjustment. relief valve.
Internal / external leakage Check gear actuating
of system. cylinders for
internal / external leakage.
Check for internal damage
to hydraulic pump.
Check for damaged
hydraulic lines.