e. Head aircraft on magnetic West and do same as step d, adjusting E-W adjusting 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.
10-42. TROUBLESHOOTING.
TABLE X-VII. MAGNETIC COMPASS
Trouble Cause Remedy
Excessive card error. Compass not properly Compensate instrument. (Refer
compensated. to Paragraph 10-41a.)
Extemal magnetic Locate magnetic interference
interference. and eliminate if possible.
Excessive card Insufficient liquid. Replace instrument.
oscillation.
Card sluggish. Wear card magnet. Replace instrument.
Excessive pivot friction Replace instrument.
or broken jewel.
Liquid leakage. Loose bezel screws. Replace instrument.
Broken cover glass. Replace instrument.
Defective sealing Replace instrument.
gaskets.
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 stipped.
Revised: 2/13/89
2G5
CHEROKEE ARROW III SERVICE MANUAL
INSTRUMENTS
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