Piper CHEROKEE WARRIOR PA-28-151 1995 Maintenance Manual page 341

PIPER CHEROKEE WARRIOR SERVICE MANUAL
10-26. TROUBLESHOOTING.
TABLE X-III. TROUBLESHOOTING ATTITUDE DEVIATION INDICATOR
Trouble
Bar fails to respond.
Bar does not settle.
Bar oscillates or shimmies
c o ntinuously.
Instrument does not indicate
level flight.
Bar high after 180° turn.
Instrument tumbles in flight.
10-27 REMOVAL AND REPLACEMENT. (Refer to Paragraph 10-71 of this section.)
Revised: February 28, 1995
Cause
Observe vacuum gauge for
insufficient vacuum.
Filter dirty.
Defective instrument.
Insufficient vacuum.
Incorrect instrument.
Defective instrument.
Instrument loose in panel.
Vacuum too high.
Defective mechanism.
Instrument not level in panel.
Aircraft out of trim.
Normal, if it does not exceed
1/16 inch.
Observe vacuum gauge for low
vacuum.
Dirty filter.
Line to filter restricted.
Plug missing or loose in
i n s t r ument.
2C5
Island Enterprises
Remedy
If insufficient vacuum exists,
check pump and tubing.
Clean or replace filter.
Replace gyro instrument.
Check line and pump. Adjust
valve.
Check part number.
Replace.
Tighten mounting screws.
Adjust vacuum regulators.
Replace instrument.
Loosen screws and level
i n s t r ument.
Trim aircraft.
If vacuum is low, reset regulator.
Clean or replace filter.
Replace line.
Replace or tighten plug.
INSTRUMENTS