T-45C TS, ADV & IUT ENG-14
Flight Control System Malfunctions
C. Effects on flight safety
1. Full runaway trim causes an out-of-trim force easily controlled—no
control is lost
2. Sustained stick pressure required to maintain control may cause
pilot fatigue
V. Runaway rudder trim 1.8.1.6.1.1
Fig 6: Rudder Trim
Operation
A. Indications
1. Yaw
2. Rudder pedal displacement
3. Yaw-induced roll
4. Failure to respond to trim inputs
B. Verifications
1. RUDDER trim indicator reads full left/right
2. Aircraft yaws (ADI slip indicator off center)
NOTE: The control augmentation system includes both rudder trim
and yaw damper systems. A malfunction with either system could
cause similar indications. If the yaw damper is enabled and the trim
returns to center when it is paddled off, the yaw damper is at fault.
If the malfunction continues after the yaw damper is deselected, the
trim system is at fault.
C. Effects on flight safety
1. Full runaway rudder trim causes an out-of-trim force that is
controllable by applying rudder and aileron and adjusting airspeed
as required
2. The continuous application of opposite rudder may cause pilot
fatigue
Original (9-98)
Page 14-5
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