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

Page: 663 / 1956

PAGE 13
Feb 28/07 3H23
29-10-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(7) Loosen the “B” nut on hose assembly at nose gear door actuator. Depress plunger on
sequence valve to purge air from line.
NOTE: Move nose gear downward if necessary to create sufficient pressure and flow to
completely bleed air from the line.
Repeat as necessary until all air is removed and then retighten the “B” nut.
(8) Loosen the “B” nuts at the main gear UP fittings. Move the main gears downward to bleed air
from the actuators. Tighten the “B” nuts.
(9) Push IN the circuit breaker and complete the retraction cycle.
(10) Place gear selector in DOWN position and loosen “B” nut on DOWN fittings on all three gear
actuators to bleed any trapped air. Retighten “B” nuts.
NOTE: Pump may run intermittently during bleeding procedure.
(11) 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.
(12) Operate the landing gear through at least three (3) complete cycles.
5. Hydraulic Lines - Removal and Installation
A. Remove damaged hydraulic lines by disconnecting the fittings at each end and where it is secured
by brackets. See Figure 1 as an aid in locating the attaching brackets and bends in the lines.
B. Provide a small container for draining the line.
C. Install new or repaired line in the reverse order of removal.
D. Bleed system and lines.
E. Check fluid level in reservoir.
6. Hydraulic System Testing
WARNING: BE SURE AIRPLANE IS ON JACKS BEFORE BLEEDING AND TESTING HYDRAULIC
SYSTEM.
WARNING: SET BATT MASTER SWITCH TO THE OFF POSITION BEFORE INSERTING OR
REMOVING EXTERNAL POWER SUPPLY PLUG.
The hydraulic system should be tested to check that it functions properly after performing any service or
repairs. It is suggested that the airplane be connected to an outside power source in order to conserve
the battery. See also Landing Gear Retraction System Functional Test, 32-30-00.
A. Place airplane on jacks (refer to 7-10-00).
B. With the gear down, place the BATT MASTER switch to the on position, and circuit breaker closed.
Place the landing gear selector in the UP position. Pump should immediately operate and gear
retract. The red gear unsafe light on the instrument panel should illuminate, until the gear is fully
retracted. The hydraulic pump should stop after full gear retraction.
C. Place the gear selector in the DOWN position. The gear should extend and lock. The gear down
lights on the instrument panel will illuminate when all three gears are locked in the down position.
Inspect hydraulic system for leakage.