TM 55-1510-222-CL
RUDDER BOOST
1.
Propeller levers - HIGH RPM
2.
Rudder boost/yaw damper test switch - Hold in YAW CONTROL TEST Position.
3.
Check rudder boost annunciator illuminated and YD ENGAGE annunciator extinguished.
4.
Yaw damper - Engage. Ensure that the Yaw Damp system will not engage.
5.
Rudder boost/yaw damper test switch - Rudder boost. Check rudder boost annunciator extinguished.
6.
Yaw damper - Engage. Observe YD ENGAGE annunciator illuminated.
7.
Advance left power lever - At approximately 60% torque differential, the YD ENGAGE annunciator 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.)
8.
Slowly retard the left power lever - Rudder pedal travel should decrease with decreasing power. At
approximately 50% torque differential, the YD ENGAGE annunciator may flicker as the Rudder Boost system
disengages.
9.
Reengage the Yaw Damper, and repeat with the other engine.
OVERSPEED GOVERNORS
1.
Propeller test switch - Hold to PROP GOVERNOR TEST position.
2.
Left power lever - Increase until propeller stabilizes at 1540 to 1580 RPM.
3.
Release propeller test switch - Observe that propeller RPM increases.
P-8
