Airplane Flight Manual Supplement

190-00682-02 Rev. C Hawker Beechcraft C90A and C90GT King Air
Page 21 of 95
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.