Piper Malibu PA-46-310P Pilot Operating Handbook page 136

I
SECTION 4
NORMAL PROCEDURES
PIPER AIRCRAFT CORPORATION
PA-46-310P, MALIBU
each associated gear is locked in the extended position.
NOTE
Day/ night dimmer switch must be in the DAY
position to obtain full intensity of the gear
position indicator lights during daytime flying.
When aircraft is operated at night the switch
should be in the NIGHT position to dim the
gear lights.
4.45 CABIN PRESSURIZATION SYSTEM
Cabin pressurization system controls. gauges and switches are located in
the lower left instrument panel. (Refer to Section 7. Figure 7-23.)
The cabin pressurization system controls. gauges and switches are as
follows:
(a) Cabin Altitude Controller with Rate of Change Control
(b) Cabin Pressure Altitude/ Differential Pressure/ Rate of Climb
Gauge
(c) Cabin Dump Switch
(d) Cabin Pressurization Control
Prior to starting engines, check the operation of the cabin pressurization
control. Note that a firm effort is required to move the lever out of either the
outside air or the pressurized air position. If little effort is required to move
the lever, be suspicious of a broken control cable. If a cable is broken. the air
control valve may have failed in either the open or closed position. If failed
open, pressurized flight will not be possible, but unpressurized flight will be
possible. If failed closed, pressurized flight would be possible but should not
be attempted, as it would not be possible to bring in fresh air should
contamination occur.
Set cabin altitude on the cabin altitude controller to 1000 feet above the
field pressure altitude before takeoff. (Cabin pressurization will begin as the
cabin passes through the altitude selected.) Cabin altitude will remain at the
selected altitude until maximum cabin differential (5.5 PSI) is reached. at
which time the cabin altitude will begin to climb until at 25000 feet aircraft
pressure altitude the cabin pressure altitude will be approximately 8000 feet.
V
For flight below an airplane altitude of 12500 feet. the cabin altitude control l ,
should be left at the takeoff setting. For flight above I 2500 feet, at which
~
point maximum differential will be achieved, set the cabin altitude on the
cabin altitude controller to 1000 feet above field elevation for takeoff. Once
the cabin has begun to pressurize and the controller has captured isobaric
REPORT: VB-1200
+32
ISSUED: JANUARY 11, 1984
REVISED: APRIL 1, 1987