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Propeller unfeathering
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TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
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Landing gear normal operation
TM 1-1510-223-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
LOW SPEED SYSTEMS CHECK (CONT)
(a) POWER lever - IDLE.  PROP lever -
Move out of FEATHER detent to full
forward.  Propeller RPM must reach
1,000 RPM in 20 seconds or less.
i. Repeat step h for other engine if required.
NOTE
The landing gear warning horn is automatically
silenced by an altitude sensing switch, provided to
silence the landing gear warning horn when above
12,500 feet.
*13. Landing gear warning horn - Check as follows:
a. POWER levers - Retard slowly, individually,
until landing gear warning horn first sounds.
*b. Turbine tachometers - Read N1 tachometers
on first hearing landing gear warning horn.
Verify that the landing gear warning horn
sounds when POWER levers are retarded
below 84 to 86% N, and airspeed is below
140 KIAS.
c. Flaps - Extend beyond APPROACH position.
Verify that the landing gear warning horn
sounds regardless of POWER lever position
(with airspeed less 140 KIAS).
d. POWER levers - Advance past 84 to 86%
N1. Check that landing gear warning horn is
armed again.
2-74

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