Airplane Flight Manual Supplement

Hawker Beechcraft C90A and C90GT King Air 190-00682-02 Rev. D
Page 30 of 117
MANUAL AUTOPILOT DISCONNECT
If necessary, the autopilot can be manually disconnected using any one of the following methods.
1. AP/YD DISC / TRIM INTRPT Button ............................................................PRESS and RELEASE
(Pilot’s or Copilot’s control wheel)
2. AP Button (Autopilot mode control panel)..............................................................................PRESS
(Yaw damper remains engaged)
3. Pitch Trim Switch (Pilot’s or, if installed, Copilot’s control wheel).................................... ACTIVATE
(Yaw damper remains engaged)
4. Go-Around (GA) switch..........................................................................................................PRESS
(Left power lever) (Yaw damper remains engaged)
5. AFCS SERVOS Circuit Breaker................................................................................................ PULL
(Right circuit breaker panel)
AUTOPILOT ABNORMAL DISCONNECT
(Red ‘AP’ flashing on PFD, Continuous high-low aural tone)
1. A/P DISC/TRIM INTRPT Button ..................................................................PRESS AND RELEASE
(to cancel disconnect tone)
2. Aircraft Attitude............................................................. MAINTAIN/REGAIN AIRCRAFT CONTROL
NOTE
The autopilot disconnect may be accompanied by a red boxed PTCH (pitch), ROLL, or AFCS
on the PFD, indicating the axis which has failed, or that the automatic flight control system
has failed. The autopilot cannot be re-engaged with any of these annunciations present.
AUTOPILOT FAILURE
(Red annunciator on PFD, Red ‘AP’ flashing on PFD, Continuous high-low aural tone)
1. AP/YD DISC / TRIM INTRPT Button .....................................................................................PRESS
(to cancel disconnect tone)
If red ‘AFCS’ is displayed, the autopilot, yaw damper, and manual electric pitch trim will be
inoperative.
PITCH AXIS FAILURE
(Red annunciator on PFD)
• Indicates a failure of the pitch 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