Airplane Flight Manual Supplement

Hawker Beechcraft C90A and C90GT King Air 190-00682-02 Rev. D
Page 98 of 117
FLIGHT CONTROLS
AFCS, AUTOPILOT AND FLIGHT DIRECTOR
The GFC 700 is a digital Automatic Flight Control System (AFCS), fully integrated within the G1000
System avionics architecture. The GFC 700 is a three axis autopilot and flight director system which
provides the pilot with the following features:
Autopilot (AP) — Autopilot operation occurs within the pitch, roll, and pitch trim servos. It also provides
servo monitoring and automatic flight control in response to flight director steering commands, AHRS
attitude and rate information, and airspeed.
Flight Director (FD) - Two flight directors, each operating independently within their respective GIA and
referred to as pilot-side and copilot-side. Commands for the selected flight director are displayed on both
PFDs.
The flight director provides:
• Command Bars showing pitch/roll guidance
• Vertical/lateral mode selection and processing
• Autopilot communication
Yaw Damper (YD) — The yaw servo is self-monitoring and provides Dutch roll damping and turn
coordination in response to yaw rate, roll angle, vertical acceleration, and airspeed.
Electric Pitch Trim — The pitch trim servo provides manual electric pitch trim capability when the autopilot
is not engaged.
Pilot commands to the AFCS are entered through the GMC 710 Autopilot Mode Controller mounted in the
center of the cockpit under the airplane’s glareshield. The GMC 710 controller also controls the heading
bug, navigation course selector on each PFD, and the altitude preselect.
Other components of the autopilot include four servos that also contain autopilot processor, control
wheel-mounted elevator trim switches (copilot’s side optional), control wheel-mounted autopilot/yaw
damper disconnect and trim interrupt switch (A/P Y/D DISC/TRIM INTRPT), control wheel-mounted CWS
(Control Wheel Steering) switch, and a go-around switch mounted in the left throttle knob.
The following conditions will cause the autopilot to disconnect:
• Electrical power failure, including pulling the AFCS circuit breaker
• Electrical power failure to the GMC 710 Autopilot Mode Controller, including pulling the MODE CTL
circuit breaker
• Internal autopilot system failure
• Malfunction of either AHRS (two fully functional AHRS are required for the autopilot to function)
• Failure of the on side PFD
• Depressing the red A/P Y/D DISC/TRIM INTRPT button on the pilot’s or copilot’s (if installed)
control wheel
• Actuating the left section of the manual electric trim split switch, pilot’s and copilot’s control wheel
• Pushing the AP button on the autopilot mode controller when the autopilot is engaged
• Pushing the GO AROUND button on the left throttle
• Turning OFF the Avionics Master Power Switch