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

Page: 813 / 1956

PAGE 7
Feb 28/07 4E7
32-30-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(21) Gear Down Pressure Switch Bypass Relay Circuit Test:
(a) In S/N’s 4636001 thru 4636313 (i.e. - airplanes equipped with Parker Hannifin hydraulic
pumps only):
1 Disconnect the gear down pressure switch circuit and conduct the Gear Selector
Switch DOWN Check, below.
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.
It is acceptable if only the nose gear fully extends down and locked. The main gear
may only extend partially. Complete main gear extension by activating the emergency
gear release valve and moving the main gear to the down and locked position.
2 Reconnect the gear down pressure switch circuit. Disconnect the gear down
pressure switch bypass relay circuit and conduct the Gear Selector Switch DOWN
Check, below.
3 Reconnect the gear down pressure switch bypass relay circuit.
(b) In S/N’s 4636314 and up (i.e. - airplanes equipped with Frisby hydraulic pumps only):
1 Disconnect the gear down pressure switch circuit, see Wire A, Figure 1, and conduct
the following sequence:
a Place the gear selector switch in the UP position. The gear should function
normally.
b Place the gear selector switch in the DOWN position. The pump will shut OFF
before the gears reach the full down position.
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.
It is acceptable if the nose gear fully extends down and locks. The main gears
may only extend partially. Complete gear extension by pulling the emergency
gear release valve and moving the main gear to the down and locked position.
c Reconnect the gear down pressure switch circuit, Wire A, Figure 1.
d Reset the emergency gear release valve.
2 Disconnect the gear down pressure switch by-pass relay circuit, see Wire B, Figure 1,
and conduct the following sequence:
a Place the gear selector switch in the UP position. The gear should function
normally.
b Place the gear selector switch in the DOWN position. The gear should function
normally.
c Reconnect the gear down pressure switch by-pass relay circuit, Wire B, Figure 1.