Magnetic Compass - Thrush Aircraft S2RHG-T65 TURBO THRUSH Maintenance Manual

THRUSH AIRCRAFT, INC – MODEL S2RHG-T65 TURBO THRUSH
PROBLEM
Hands oscillate.
Excessive card error
Excessive card
oscillation
Card element not
level, sluggish
Liquid leakage from
case
Effective: 9/16/05
AIRCRAFT MAINTENANCE MANUAL
PROBABLE CAUSE
ALTIMETER (Continued)
Leaking diaphragm
Pointers out of
calibration.
Static pressure
irregular.
Leak in airspeed or
vertical speed
indicator installations.

MAGNETIC COMPASS

Compass not properly
compensated
External magnetic
interference
Insufficient liquid
Excessive vibration of
compass
Compass excessively
compensated
Leaking float chamber
due to broken cover
glass or case, or
defective sealing
gaskets, weak or
detached card
magnets, pivot friction,
or broken jewel
REMEDY
Substitute known-good altimeter
and check reading. Replace
instrument.
Compare reading with known-
good altimeter. Replace
instrument.
Check lines for obstructions or
leaks. Check static source. Blow
out lines, tighten connections.
Clean static source.
Check other instruments and
system plumbing for leaks and
obstructions. Blow out lines,
tighten connections.
Swing compass and compensate.
Locate and eliminate interference.
Replace compass.
Remove cause of vibration.
Back compensating screws off to
remove all compensation, then
recompensate compass.
Replace compass.
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