FAA Approved Airplane Flight Manual Supplement

Hawker Beechcraft King Air 300/300LW 190-00716-02 Rev. 1
Page 114 of 137
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 (AP/YD DISC/TRIM INTRPT), control wheel-mounted CWS
(Control Wheel Steering) switch, and a Go-Around switch mounted in the left power lever knob.
The following conditions will cause the autopilot to disconnect:
• Electrical power failure, including pulling the AFCS SERVOS 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 power lever (non-ESP equipped airplanes)
NOTE
Pressing and holding the CWS (control wheel steering) switch on the left grip of the pilot’s control
wheel will disconnect the autopilot servos from the airplane flight controls as long as the CWS
switch is depressed. Upon release of the CWS switch, the system will synchronize to the existing
pitch and roll modes selected. Review the Cockpit Reference Guide for more information.