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

Page: 661 / 1956

PAGE 11
Feb 28/07 3H21
29-10-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
4. Bleeding Hydraulic System
(PIR-PPS60033-7, Rev. G/-9, Rev. J/-13, Rev. NEW.)
WARNING: BE SURE AIRPLANE IS ON JACKS BEFORE BLEEDING AND TESTING HYDRAULIC
SYSTEM.
A. Set up
(1) Place the airplane on jacks per 7-10-00.
(2) Connect a 28 Vdc regulated power source capable of supplying a minimum of 50 amperes to
the aircraft electrical system.
NOTE: With power supplied through the auxiliary power plug the batt-master switch should
remain in the "OFF" position. The APU circuit bypasses the batt-master switch to
energize the ship power circuits.
NOTE: Before starting test, check for adequate clearance of nose gear lights, sequence
valves, actuators, hoses, etc.
NOTE: Never operate the emergency gear release piston with the hydraulic pump circuit
breaker “IN”.
(3) During all tests, add clean filtered MIL-H-5606 (Revision "F" or higher) hydraulic fluid to the
reservoir as necessary to keep fluid level at the "F" (full) mark on the sight gauge with the gear
down.
B. Procedure
CAUTION: DO NOT PULL THE EMERGENCY GEAR RELEASE KNOB WHILE THE HYDRAULIC
PUMP IS OPERATING. ALWAYS PULL THE HYDRAULIC PUMP CIRCUIT BREAKER
BEFORE TESTING THE EMERGENCY GEAR RELEASE SYSTEM. FAILURE TO
COMPLY WILL DAMAGE THE EMERGENCY GEAR RELEASE VALVE.
CAUTION: DO NOT OVERFILL AND DO NOT ALLOW HYDRAULIC FLUID LEVEL TO DROP
BELOW THE "L" (LOW) MARK ON THE SIGHT GAUGE WITH THE GEAR IN THE
DOWN POSITION.
NOTE: Follow this sequence below to reduce foaming. Add fluid to reservoir as needed.
(1) Disconnect rod assemblies between nose gear doors and door actuating torque tube assembly
to prevent door actuation.
(2) Screw the sequence valve plunger adjustment screw all the way IN.
(3) In S/N’s 4636001 thru 4636313 only (i.e. - airplanes equipped with Parker Hannifin hydraulic
pumps only):
(a) With the gear down, pull OUT the emergency gear release knob.
(b) Place the gear selector in the UP position. Operate pump for 10 to 15 seconds.
(c) Return the gear selector to the DOWN position. Push the emergency gear release knob IN.
(4) Operate the gear through at least five (5) complete cycles, adding fluid to the reservoir as
required.
(5) Starting with the gear down, pull the hydraulic pump circuit breaker and place the gear selector
switch in the UP position.
(6) Using the circuit breaker as a switch, allow the gear to retract until the nose gear is about half
way up and then pull the circuit breaker.