TM 55-1510-222-10
8-21.* TAXIING.
Taxi speed can be effectively controlled by the use of
power application and the use of the variable pitch
propellers in the ground fine range.
1.
Brakes Check.
2.
Flight instruments Check for normal operation.
8-22. ENGINE RUNUP.
1.
Mission control panel Set.
2.
Propeller feathering Check by pulling propeller
levers aft past the detent to FEATHER. Check that each
propeller feathers, then advance levers to the LOW
RPM position.
*
3.
Autofeather Check as follows:
a.
Power levers Approximately 25% torque.
b.
Autofeather
switch
Hold
to
TEST
(both
AUTOFEATHER annunciators illuminated).
c.
Power levers Retard individually.
(1)
At
14%
to
20%
torque
Opposite
annunciation extinguished.
(2)
At 7% to 13% torque Both annunciators
extinguished (propeller starts to feather).
NOTE
·
The power lever may have to be
lifted and pulled towards the
ground fine gate in order to
attain the 7% to 13% torque.
·
Autofeather
annunciators
will
illuminate and extinguish with
each fluctuation of torque as the
propeller feathers.
(3)
Return power lever to approximately 25%
torque.
d.
Repeat above procedure with other engine.
e.
Autofeather switch ARM.
*
4.
Rudder boost Check as follows:
a.
Propeller levers HIGH RPM
b.
Rudder boost/yaw damper test switch Hold in
YAW CONTROL TEST position.
c.
Check
RUDDER
BOOST
annunciation
illuminated,
and
YD
ENGAGE
annunciation
extinguished.
d.
Yaw damper Engage. Ensure that the Yaw
Damp system will not engage.
e.
Rudder boost/yaw damper test switch RUDDER
BOOST. Check RUDDER BOOST annunciation
extinguished.
f.
Yaw damper Engage. Observe YD ENGAGE
annunciation illuminated.
g.
Advance left power lever At approximately 60%
torque differential, the YD ENGAGE annunciation
should extinguish, and the left rudder pedal should start
to move forward. Increasing engine power should result
in increased rudder pedal travel. (Observe torque and
TGT limits).
h.
Slowly retard the left power lever Rudder pedal
travel should decrease with decreasing power. At
approximately 50% torque differential, the YD ENGAGE
annunciation may flicker as the Rudder Boost system
disengages.
i.
Reengage the Yaw Damper, and repeat with the
other engine.
*
5.
Overspeed governor Check as follows:
a.
Propeller
test
switch
Hold
to
PROP
GOVERNOR TEST position.
b.
Left
power
lever
Increase
until
propeller
stabilizes at 1540 to 1580 RPM.
c.
Release propeller test switch Observe that
propeller RPM increases.
d.
Repeat above steps with other engine.
*
6.
Primary governors Check as follows:
a.
Power levers Set at 1500 RPM.
b.
Exercise propeller Move aft to detent, then
return to high RPM.
7.
Propeller levers Retard to detent.
8.
Power levers Ground fine.
*
9.
Engine anti-ice Check as follows:
a.
Ice vane power select switch MAIN.
b.
Ice vane control switches off, verify VANE
EXTEND annunciators extinguish.
c.
Ice vane power select switch STBY.
d.
Ice vane control switches ON, verify VANE
EXTEND annunciators illuminated.
e.
Ice vane power select switch MAIN.
*
10.
Anti-ice and deice systems Check as follows:
8-14
