FAA Approved Airplane Flight Manual Supplement

190-00682-02 Rev. F Hawker Beechcraft C90A, C90GT and C90GTi King Air
FAA APPROVED Page 43 of 124
RUDDER MISTRIM (amber or annunciation on PFD)
Indicates a mistrim of the rudder while the autopilot is engaged. The autopilot cannot trim the
airplane in yaw. During large changes in airspeed, engine failure, or single engine operation,
illumination of this message may occur. If the autopilot is disconnected while this message is
displayed, high rudder pedal forces and yawing motion are possible. The following procedure
should be followed:
1. Rudder Pedals ........................................................................................................... HOLD FIRMLY
2. Rudder Tab Knob .................................... ROTATE SLOWLY IN THE DIRECTION OF INDICATED
MISTRIM UNTIL ANNUNCIATION EXTINGUISHES
If the annunciator stays extinguished and no other annunciations illuminate:
• Continue to operate the autopilot in a normal manner after the annunciation extinguishes.
If the annunciator remains illuminated or reappears with no changes in airspeed or configuration from the
previous trimmed condition:
3. Rudder Pedals ........................................................................................................... HOLD FIRMLY
4. Rudder Tab Knob .................................... ROTATE SLOWLY IN THE DIRECTION OF INDICATED
MIS-TRIM UNTIL ANNUNCIATION EXTINGUISHES
5. YD Button ............................................................................................... PRESS on Mode Controller
6. Rudder Tab Knob .......................................................................... MANUALLY RETRIM AIRPLANE
Yaw Damper should be considered inoperative until the cause of the mistrim has been
investigated and corrected. The Autopilot can continued to be used normally without the Yaw
Damper.