Airplane Flight Manual Supplement

190-00682-02 Rev. C Hawker Beechcraft C90A and C90GT King Air
Page 29 of 95
AUTOMATIC FLIGHT CONTROL SYSTEM
AILERON MISTRIM (amber or annunciation on PFD)
Indicates a mistrim of the ailerons while the autopilot is engaged. The autopilot cannot trim the
airplane in roll. 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 roll forces are possible. The following procedure should be followed:
1. Control Wheel .............................................................................................................GRIP FIRMLY
2. Aileron Tab Knob ............................................ ROTATE SLOWLY IN DIRECTION OF INDICATED
MISTRIM UNTIL THE 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 CHANGE IN
AIRSPEED OR CONFIGURATION FROM THE PREVIOUS TRIMMED CONDITION:
3. Control Wheel .............................................................................................................GRIP FIRMLY
4. Aileron Tab Knob ....................................ROTATE SLOWLY IN THE DIRECTION OF INDICATED
MISTRIM UNTIL ANNUNCIATION EXTINGUISHES
5. AP/YD DISC / TRIM INTRPT Button ............................................................PRESS and RELEASE
(Pilot’s or Copilot’s control wheel)
6. Roll Trim......................... USING AILERON TAB KNOB, MANUALLY RETRIM AIRPLANE
Autopilot should be considered inoperative until the cause of the mistrim has been investigated and
corrected. Yaw damper may be re-engaged and used normally
ELECTRIC PITCH TRIM INOPERATIVE
NOTE
This condition may be accompanied by a red or annunciation on the PFDs.
1. Move both halves of pilot and copilot pitch trim switches to check for stuck switch
2. AFCS SERVOS Circuit Breaker............................................................................PULL and RESET
(Right circuit breaker panel)
The autopilot will enter Pre-Flight Test (PFT) mode when the AFCS SERVOS circuit breaker is reset.
If the autopilot successfully completes the Pre-Flight Test, re-engage the autopilot, reselect the
desired autopilot modes, and continue to use normally. If the Pre-Flight Test fails, indicated by a red
on the PFDs, the autopilot, yaw damper, and electric pitch trim will be inoperative for the
remainder of the flight.