Magnetic Compass Troubleshooting - Piper PA-44-180 SEMINOLE Maintenance Manual

TROUBLESHOOTING.
CHART 3404. TROUBLESHOOTING (MAGNETIC COMPASS)
Trouble
Excessive card error.
Excessive card oscillation.
Card sluggish.
Liquid leakage.
Discolored markings.
Defective light.
Card sticks.
Card does not move when
compensating screws are
turned.
Compass swings erratically
when radio transmitter is
keyed.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Cause
Compass not properly
compensated.
External magnetic inter-
ference.
Insufficient liquid.
Weak card magnet.
Excessive pivot friction or
broken jewel.
Loose bezel screws.
Broken cover glass.
Defective sealing gaskets.
Age.
Burned out lamp or broken
circuit.
Altitude compensating
diaphragm collapsed.
The gears that turn com-
pensating magnets may be
stripped.
Normal.
2J1
Remedy
Compensate instrument.
(Refer to AC 43.13-1A
Chapter 16, Section V.)
Locate magnetic interference
and eliminate if possible.
Replace or repair instrument.
Replace or repair instrument.
Replace or repair instrument.
Replace or repair instrument.
Replace or repair instrument.
Replace or repair instrument.
Replace or repair instrument.
Check lamp or continuity
of wiring.
Replace or repair instrument.
Replace or repair instrument.
Revised: May 15, 1989
3 4 - 2 1 - 0 2
Page 34-07