Airplane Flight Manual Supplement

190-00682-02 Rev. D Hawker Beechcraft C90A and C90GT King Air
Page 31 of 117
ROLL AXIS FAILURE
(Red annunciator on PFD)
• Indicates a failure of the roll axis of the autopilot. The autopilot will be inoperative.
NOTE
If the red annunciator illuminates without the autopilot engaged, it may indicate a
faulted AHRS. Monitor both PFDs and the standby attitude indicator for abnormal attitude
indications.
YAW AXIS FAILURE
(Red annunciator on PFD)
• Indicates a failure of the yaw axis of the autopilot. The pitch and roll axes of the autopilot will
remain operative. DO NOT pull and reset the AFCS SERVOS circuit breaker. Resetting the
AFCS SERVOS circuit breaker could cause the entire autopilot to become inoperative when no
fault exists in the pitch and roll axes.
NOTE
If the red annunciator illuminates without the autopilot engaged, it may indicate a
faulted AHRS. Monitor both PFDs and the standby attitude indicator for abnormal attitude
indications.
PITCH TRIM FAILURE
(Red annunciator on PFD)
1. CONTROL WHEEL.....................................................................................................GRIP FIRMLY
2. AP/YD DISC / TRIM INTRPT Button ............................................................PRESS and RELEASE
(Be prepared for possible high elevator control forces)
3. Elevator Trim...................................................... AS REQUIRED USING ELEVATOR TAB WHEEL
If Red Message Clears
• Autopilot ....................................................................................................................... RE-ENGAGE
If Red
Message Remains
4. Autopilot ........................................................................................................ DO NOT RE-ENGAGE
5. Elevator Trim.......................................................... CONTINUE TO USE ELEVATOR TAB WHEEL