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

Page: 297 / 1956

PAGE 1
Feb 28/07
2C19
21-30-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
PRESSURIZATION CONTROL
1. General
The cabin pressurization and control system consists of an outflow valve (isobaric), safety valve, cabin
altitude and rate selector, electrically operated vacuum solenoid valve, surge tank and associated inter-
connecting plumbing and wiring. Cabin altitude, differential pressure, and rate of change are displayed
on a single 3-inch diameter indicator. Pilot warning (displayed on the annunciator panel) is provided to
indicate a cabin altitude above 10,000 feet.
The cabin safety valve is held open on the ground with the engine operating by a vacuum applied to the
control chamber of the safety valve. The vacuum regulator of the vacuum system provides a vacuum of
4.8-5.2 in. mercury referenced to cabin pressure. This vacuum holds the safety valve open while on the
ground through the action of the landing gear squat switch, which energizes the vacuum relief solenoid
valve to the open position. A cabin dump switch is also provided to rapidly depressurize the cabin in
flight, by energizing the vacuum relief valve solenoid valve.
See Chapter 91 for electrical schematics.
2. Troubleshooting
See Chart 1.