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TM 55-4920-400-13
Table 3-1. Troubleshooting Chart (Contd)
Item No.
Trouble
Probable Cause
Possible Remedy
3 Indicator light illurnin-
Shorted transformer. (Check con-
ates but motor does not
tinuity for shorts
run.
Open lead in motor. (Check for
continuity.)
Defective motor.
Armature defective.
Open circuit in motor armature or
field winding. (Check resistance
between motor input and ground -
should be approx. 1.7 ohms.)
4 Motor runs slowly.
Commutator worn or dirty. De-
fective motor bearings.
Section III. PNEUMATIC SYSTEM
3-5.
Valves.
Inspection, testing, cleaning, and
replacement of valves is accomplished as stated in
paragraphs 2-37/48/49 and 51 under conditions speci-
fied; replacement of valves maybe accomplished by the
AVIM. Repair of valves consists primarily of replace-
ment of individual defective parts as indicated during
disassembly and inspection procedures outlined in the
paragraphs stated above.
3-6.
Instruments.
a. Calibration
Calibrate each instrument of
the tester by comparing its reading against standard
instrument, gauge, or other applicable apparatus. Cal-
ibration of the master instruments (those of tester)
may be performed, without their removal from the test-
er, in a manner similar to that used in testing a remote
instrument. Refer oo the applicable technical manual
for the particular instrument for range of accuracy in
calibrating.
Replace transformer.
Repair or replace motor.
Repair or replace motor.
Repair or replace armature.
Repair or replace motor.
Repair commutator.
Replace bearings.
b. Repair.
Accomplish repair of instruments
in accordance with the applicable technical manuals
for the part numbers as listed below.
Instrument
Part No.
Rate of climb indicator
MS28049
Altimeter
MS28044-1
Airspeed Indicator
MS28021-1
3-7. Oil Reservoir.
Remove, disassemble, clean,
and inspect the reservoir assembly tis outlined in para-
graph 2-48. Repair of the reservoir consists primarily of
the replacement of defective parts as a consequence of
inspection and observance of function. Reassemble and
install the reservoir as outlined in paragraph 2-50.
3-2
Change 2
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