c. Head aircraft on a magnetic East heading and do the same as Step b, adjusting E-W adjusting screw.
d. Head aircraft on a magnetic South heading and note resulting South error. Adjust N-S adjusting screw
until one-half of this error has been removed.
e. Head aircraft on magnetic West and do the same as Step d, adjusting E-W adjustment screw.
f. Head aircraft in successive magnetic 30° headings and record compass readings on appropriate
deviation card. Deviations must not exceed ± 10°on any heading.
10-54. TROUBLESHOOTING.
TABLE X-VII. MAGNETIC COMPASS
Trouble
Cause
Remedy
Excessive card error.
Compass not properly
Compensate instrument. (Refer
compensated.
External magnetic
Locate magnetic interference
interference.
and eliminate if possible.
Excessive card
Insufficient liquid.
Replace instrument.
oscillation.
Card sluggish.
Weak card magnet.
Replace instrument.
Excessive pivot
Replace instrument.
friction or broken jewel.
Liquid leakage.
Loose bezel screws.
Replace instrument.
Broken cover glass.
Replace instrument.
Defective sealing gaskets.
Replace instrument.
Discolored markings.
Age.
Replace instrument.
Defective light.
Burned out lamp or
Check lamp or continuity
broken circuit.
or wiring.
Card sticks.
Altitude compensating
Replace instrument.
diaphragm collapsed.
Card does not move
The gears that turn
Replace instrument.
when compensating
compensating magnets
screws are turned.
are stripped.
Compass swings
Normal.
erratically when radio
transmitter is keyed.
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
I N S T R U M E N T
2C3