Cessna 1969-1976 172 Series Service Manual page 240

1
5 -5 6. TURN -AND -SLIP INDICATOR.
15-57. DESCRJPTION. The turn-and-slip indicator when the master switch is ON.
is a n electrically operated instrument powered by the
a i r c r a f t electrical system, therefore, operating only
TROUBLE PROBABLE CAUSE
15-58. TROUBLE SHOOTING.
REMEDY
HAND SLUGGISH IN
RETURNING TO ZERO.
INDICATOR POINTER FAILS TO
RESPOND.
Master switch "OFF" o r Check switch "ON.
I '
Replace
switch defective. defective switch.
Broken o r grounded lead to Check circuit wiring. Repair
indicator. o r replace defective wiring.
Indicator not grounded. Check ground wire. Repair
or replace defective w i r e .
Replace instrument.
Defective mechani sm
.
Defective mechanism. Replace instrument.
Low voltage. Check voltage
at
indicator.
Correct voltage.
Check wiring f o r continuity,
check voltage a t indicator.
Replace fuse, i f fuse still
blows, replace instrument.
Gimbal and rotor out of balance.
Hand incorrectly sits on rod.
Sensitivity spring adjustment
pulls hand off zero.
Replace instrument.
Replace instrument.
Replace instrument.
POINTER DOES NOT INDICATE
PROPER TURN.
Defective mechanism.
I
High voltage,
Loose
o r
defective rotor
bearings.
Replace instrument.
I
-~
Check voltage a t indicator.
Correct voltage.
Replace instrument.
HAND DOES NOT SIT
ON ZERO.
IN COLD TEMPERATURES,
HAND FAILS TO RESPOND
OR IS SLUGGISH.
Replace instrument.
I
Oil in indicator becomes too
I
thick.
I
Insufficient bearing end play.
I
Replace instrument.
Low voltage.
r
Check voltage
at
indicator.
I
Correct voltage.
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NOISY GYRO
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15-22