Piper Navajo PA-31 Service Manual page 665

PIPER NAVAJO SERVICE MANUAL
TABLE X-II.
TROUBLESHOOTING CHART (INSTRUMENTS) (cont.)
Trouble
Cause
Remedy
DIRECTIONAL GYRO INDICATOR (cont.)
Excess drift in either
direction.
Dial spins continuously.
Defective instrument.
Defective mechanism.
Replace instrument.
Replace instrument.
ALTIMETER
Excessive scale error.
Excessive pointer
oscillation.
High reading.
Setting knob is hard
to turn.
Inner reference mark-
er fails to move when
setting knob is rotated.
Setting knob set screw
loose or missing.
Improper calibration
adjustment.
Defective mechanism.
Improper venting.
Wrong lubrication or
lack of lubrication.
Out of engagement.
Excessive vibration.
Replace instrument.
Replace instrument.
Eliminate leak in static
pressure system and
check alignment of air-
speed tube.
Replace instrument.
Replace instrument.
Tighten instrument
screw, if loose.
Re-
place instrument if
screw is missing.
Reissued: 10/12/79
INSTRUMENTS
3E3