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Engine fails to or is slow to accelerate propeller to idle speed.
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TM-55-1510-218-MTF Maintenance Test Flight Manual Army Model C-12C C-12D and C-12F Aircraft
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Fuel quantity gage pegs down scale against stop.
TM 55-1510-218-MTF
TROUBLESHOOTING GUIDE B - INSTRU-
MENTS
CONDITION
PBOBABLE CAUSE
Airspeed indicator reading remains fixed.
B1.
a. Pitot pressure line clogged with ice or debris.
Vertical velocity indicator inaccurate or inopera-
B2.
tive.
a. Static line clogged.
b. Leak in line or instrument case or loose fit-
tings.
c. Defective vertical velocity indicator.
Airspeed indicator reads incorrectly or fluctuates
B3.
excessively.
a. Pitot tube or pressure line partially restrict-
ed or leaking.
b. Static port or line clogged or static line leak-
ing.
c. Faulty airspeed indicator.
B4.
Magnetic compass inaccurate, sluggish or errat-
ic.
a. Insufficient liquid.
b. External magnetic interference.
c. Defective compass.
d. Windshield heat on.
Turn-and-slip indicator inoperative or erratic.
B5.
a. Tripped turn-and-slip circuit breaker.
b. Defective turn-and-slip instrument.
B6.
Fuel quantity indicator fluctuates or reads low.
a. Defective pins in connector on harness that
mates with gage.
3-4

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