Technical data

13773-001
34-20
Page 2 30 Nov 2000
2. TROUBLESHOOTING
Trouble - Magnetic Compass Probable Cause Remedy
Excessive card error. Compass not properly compen-
sated.
Compensate instrument.
External magnetic interference. Locate magnetic interference and
eliminate if possible.
Excessive card oscillation. Insufficient fluid. Replace instrument.
Card sluggish. Weak card magnet. Replace instrument.
Excessive pivot friction or broken
jewel.
Replace instrument.
Liquid leakage. Loose bezel screws. Replace instrument.
Broken cover glass Replace instrument.
Defective sealing gaskets. Replace instrument.
Defective light. Burned out lamp or broken circuit. Check lamp or continuity of wiring.
Card sticks. Altitude compensating diaphragm
collapsed.
Replace instrument.
Card does not move when com-
pensating screws are turned.
Gears that turn compensating
magnets stripped.
Replace instrument.
Compass swings erratically when
radio transmitter is keyed.
Normal.
Excessive drift in either direction. Excessive vibration. Tighten mounting screws.
Trouble - Turn Coordinator Probable Cause Remedy
Turn coordinator incorrect sensi-
tivity.
Out of calibration. Replace instrument.
Turn coordinator/roll computer ball
not centered when airplane is cor-
rectly trimmed.
Instrument not level in panel. Level instrument.
Noisy gyro. High voltage. Check voltage in indicator and cor-
rect.
Loose or defective rotor bearings. Replace instrument.
In cold temperatures, turn coordi-
nator/roll computer wing pointer
fails to respond or is sluggish.
Oil in indicator too thick. Replace instrument
Insufficient bearing end play. Replace instrument.
Low voltage. Check voltage in indicator and cor-
rect.