TM 1-1510-225-10
8A-14
*
8A-29. TAXIING.
CAUTION
Never taxi with a flat tire or a flat shock
strut. During taxi operations, particular
attention should be given to propeller tip
clearance. Extreme caution is required
when operating on unimproved or irregular
surfaces or when high winds exist. If
operations produce a propeller RPM over
1600, retard propeller levers to the detent
to limit RPM to 1600 to help reduce the
possibility of ingestion of ground debris.
1. Brakes Check.
2. Flight instruments Check.
8A-30. ENGINE RUNUP.
1. Parking brake As required.
2. Manual prop feathering Check.
H 3. AUTOFEATHER/AUTO IGNITION Check
as required.
a. AUTO IGNITION
switches
ARM.
IGNITION ON annunciators illuminated.
b. POWER levers 500 ft-lb. IGNITION ON
annunciators extinguish.
c. AUTOFEATHER switch Hold to TEST.
Both
AUTOFEATHER
annunciators
illuminated.
d. POWER levers Retard individually.
(1) Approximately
400
ft-lb
torque,
opposite AUTOFEATHER annunciator
extinguished,
IGNITION
ON
annunciator illuminated.
(2) Approximately 260 ft-lb torque, both
AUTOFEATHER
annunciators
extinguished (prop begins to feather).
Both
IGNITION
ON
annunciators
illuminated.
NOTE
AUTOFEATHER
annunciators
will
illuminate and extinguish
with
each
fluctuation of torque as the propeller
attempts to feather.
(3) Return
POWER
levers
to
approximately 500 ft-lb torque.
e. Repeat procedure with other engine.
f. POWER levers IDLE.
g. AUTOFEATHER switch ARM.
h. AUTO IGNITION switches Off.
H
4. Overspeed governors and rudder boost
Check as required.
a. RUDDER BOOST switch On.
b. PROP levers HIGH RPM.
c. PROP GOV TEST switch Hold in TEST
position.
d. Left POWER lever Increase until
propeller is stabilized at 1830 1910 RPM.
Continue
to
increase
until
rudder
movement is noted. Observe ITT and
torque limits; and PROP remains stabilized
at 1830 1910 RPM.
e. POWER lever Retard to IDLE.
f. Repeat steps c, d, and e for the right
engine.
H
5. Primary governors Check as required.
a. POWER levers Set 1800 RPM.
b. PROP levers Retard to FEATHER
detent. Note propellers stabilize between
1600 and 1640 RPM.
c. PROP levers HIGH RPM. Note
propellers return to 1800 RPM.
H 6. ICE VANES Check.
a. ICE VANES EXTEND.
(1) Both advisory lights illuminated.
(2) Both bypass doors extended.
(3) Maximum time for (1) and (2) is
15 seconds.
b. ICE VANES RETRACT.
(1) Both advisory lights extinguish.
(2) Both bypass doors retracted.
(3) Maximum time for (1) and (2) is
15 seconds.
7. CONDITION levers HIGH IDLE.
8. POWER levers IDLE.