Piper SARATOGA PA-32-301 Maintenance Manual page 368

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
CHART 3405. TROUBLESHOOTING (DIRECTIONAL GYRO INDICATOR)
Trouble
Cause
Remedy
Excess drift in either
direction.
Setting error.
Review paragraph titled
"General" for gyro op-
eration.
Defective instrument.
High or low vacuum. If
vacuum is not correct,
check for the following:
1. Relief valve improp-
erly adjusted.
2. Incorrect gauge read-
ing.
3. Pump failure.
4. Vacuum line kinked or
leaking.
Replace instrument.
1. Adjust.
2. Replace gauge.
3. Repair or replace.
4. Check and repair. Check
for collapsed inner wall
of hose.
Dial spins during turn.
Limits (55
°
bank) or gimbal exceeded.
Recage gyro in level flight.
Dial spins continuously. Defective mechanism.
Replace.
MAGNETIC COMPASS.
The magnetic compass is a self-contained instrument. This instrument has an individual light which is
connected to the instrument lighting circuit. The compass correction card is located in the card holder
mounted on the instrument. The compass should be swung whenever instruments or radios are changed and at
least once a year.
ADJUSTMENT OF COMPASS.
Before attempting to compensate compass, every effort should be made to place the aircraft in simulated
flight conditions: check to see that the doors are closed, flaps in retracted position, engine running, throttle set
at cruise position and aircraft in level flight attitude. Aircraft master switch, alternator switch and all radio
switches should be in the ON position. All other cockpit controlled electrical switches should be in the OFF
position.
1. Set adjustment screws of compensator on zero. Zero position of adjusting screws is when the dot of
the screw is lined up with the dot of the frame.
2. Head aircraft on a magnetic North heading. Adjust N-S adjustment screw until compass reads
exactly North.
34-10-07
Page 34-09
Issued: January 2. 1980
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