THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 1
Feb 19/04
3I1
34-20-00
ATTITUDE AND DIRECTION
1. Attitude Indicator
A. Description
Attitude Indicator is essentially an air driven gyroscope rotating in a horizontal plane and is
operated by same principal as directional gyro (see below). Due to gyroscopic inertia, spin axis
continues to point in vertical direction, providing a constant visual reference to attitude of airplane
relative to pitch and roll axis. A bar across face of indicator represents horizon and aligning
miniature airplane to horizon bar simulates alighnent of airplane to actual horizon. Any deviation
simulates deviation of airplane from true horizon. Attitude Indicator is marked for different degrees
of bank.
B. Troubleshooting
See Chart 1.
CHART 1
TROUBLESHOOTING ATTITUDE INDICATOR
Trouble Cause Remedy
Bar fails to respond. Insufficient vacuum. Check pump and tubing.
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° turn. Normal,
if it does not exceed 1/16 inch.
Instrument tumbles in flight. Low vacuum. Reset regulator.
Dirty filter. Clean or replace filter.
Line to filter restricted. Replace line.
Plug missing or loose in Replace or tighten plug.
instrument.
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