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

Page: 947 / 1956

PAGE 1
Feb 28/07 5D5
34-20-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
ATTITUDE & DIRECTION
1. Attitude Indicator
The Attitude Indicator is essentially an air driven gyroscope rotating in a horizontal plane and is operated
on the principal of rigidity in space. Due to the gyroscopic inertia, the spin axis continues to point in the
near vertical direction, providing a constant visual reference to the attitude of the airplane relative to
pitch and roll axis. A bar across the face of the indicator represents the horizon, and aligning the
miniature airplane to the horizon bar simulates the alignment of the airplane to the actual horizon. Any
deviation simulates the deviation of the airplane from the true horizon. The Attitude Indicator is marked
for different degrees of bank.
A. Troubleshooting
See Chart 1.
B. Removal and Installation
See 39-10-00, Face Mounted Instruments - Removal and Installation.
Trouble Cause Remedy
Bar fails to respond. Insufficient vacuum. Check pump and tubing.
Vacuum System Filter dirty. Clean or replace filter.
Bar does not settle. Insufficient vacuum. Check line and pump.
Adjust valve.
Incorrect instrument. Check part number.
Defective instrument. Replace.
Bar oscillates or shimmies Instrument loose in panel. Tighten mounting screws.
continuously.
Vacuum too high. Adjust valve.
Defective mechanism. Replace instrument.
Instrument does not indicate Instrument not level in Loosen screws and level
level flight. panel. instrument.
Aircraft out of trim. Trim aircraft.
Bar high after 180° Normal, if it does not Self correcting.
turn. exceed 1/16th inch.
Instrument tumbles in Low vacuum. Reset regulator.
flight.
Dirty Vacuum System filter. Clean or replace filter.
Line to filter restricted. Replace line.
Plug missing or loose in Replace or tighten plug.
instrument.
CHART 1
TROUBLESHOOTING ATTITUDE INDICATOR