Airplane Flight Manual Supplement

Hawker Beechcraft C90A and C90GT King Air 190-00682-02 Rev. C
Page 20 of 95
Bolded checklist steps in the EMERGENCY PROCEDURES section indicate pilot
memory action items. The pilot shall perform these items without reference to the
checklist in this section.
AUTOMATIC FLIGHT CONTROL SYSTEM
AUTOPILOT MALFUNCTION / ELEVATOR TRIM RUNAWAY
If the airplane deviates unexpectedly from the planned flight path:
1. Control Wheel............................................................................................................GRIP FIRMLY
2. AP/YD DISC / TRIM INTRPT Button................................................................PRESS AND HOLD
(Be prepared for possible high elevator control forces)
3. Aircraft Attitude.........................................................MAINTAIN/REGAIN AIRCRAFT CONTROL
use standby attitude indicator if necessary
NOTE
Do not release the AP/YD DISC / TRIM INTRPT Button until after pulling the AFCS SERVOS
Circuit Breaker.
4. Elevator Trim......................................................... RETRIM if necessary using Elevator Tab Wheel
5. AFCS SERVOS Circuit Breaker................................................................................................ PULL
(Right circuit breaker panel)
6. AP/YD DISC / TRIM INTRPT Button ................................................................................ RELEASE
IN FLIGHT, DO NOT OVERPOWER THE AUTOPILOT. THE TRIM WILL OPERATE IN THE
DIRECTION OPPOSING THE OVERPOWER FORCE, WHICH WILL RESULT IN LARGE
OUT-OF-TRIM FORCES.
DO NOT ATTEMPT TO RE-ENGAGE THE AUTOPILOT OR USE MANUAL ELECTRIC PITCH
TRIM UNTIL THE CAUSE OF THE MALFUNCTION HAS BEEN CORRECTED.
NOTE
The maximum altitude lost during malfunction tests was:
Climb – 0 Feet
Cruise – 50 Feet
Descent – 320 Feet
Maneuvering – 0 Feet
Approach – 54 Feet
One-engine inoperative approach – 45 Feet
WARNING