CHART 3405. TROUBLESHOOTING (DIRECTIONAL GYRO INDICATOR)
Trouble Cause Remedy
Excess drift in either Setting error. Review paragraph titled
direction. “General” for gyro op-
eration.
Defective instrument. Replace instrument.
High or low vacuum. If
vacuum is not correct,
check for the following:
1. Relief valve improperly 1. Adjust.
adjusted.
2. Incorrect gauge reading. 2. Replace gauge.
3. Pump failure. 3. Repair or replace.
4. Vacuum line kinked or 4. Check and repair. Check
leaking. for collapsed inner wall
of hose.
Dial spins during turn. Limits (55° bank) of gimbal Recage gyro in level flight.
exceeded.
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 34-10
December 1, 1978
2G18
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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