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Engine fails to light up.
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TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
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TROUBLESHOOTING GUIDE C - ELECTRICAL - TM-1-1510-223-MTF0101
TM 1-1510-223-MTF
A7. Engine fails to or is slow to accelerate propeller to
idle. speed.
a. Propeller oil transfer sleeve binding.
TROUBLESHOOTING GUIDE B - INSTRUMENTS
CONDITION
PROBABLE CAUSE
B1.
Airspeed indicator reading remains fixed.
a. Pitot pressure line clogged with ice or debris.
b. Defective indicator.
B2.
Vertical  speed
indicator
inaccurate
or
inoperative.
a. Static line clogged.
b. Leak in line or instrument case or loose fittings.
c. Defective vertical velocity indicator.
B3.
Airspeed  indicator  reads
incorrectly
or
fluctuates excessively.
a. Pitot tube or pressure line partially restricted or
leaking.
b. Static port or line clogged or static line leaking.
c. Faulty airspeed indicator.
B4.
Magnetic compass inaccurate, sluggish, or
erratic.
a. Insufficient liquid.
b. External magnetic interference.
c. Defective compass.
d. Windshield heat on.
e. Air conditioner on.
f. Sun visors not stowed outboard.
g. EFIS power switches on.
B5.
Turn-and-slip indicator inoperative or erratic.
a. No pneumatic pressure.
b. Defective turn-and-slip instrument.
3-3

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