FAA Approved Airplane Flight Manual Supplement

190-00716-02 Rev. 2 Hawker Beechcraft King Air 300/300LW
Page 111 of 135
FLIGHT CONTROLS
AFCS, AUTOPILOT, FLIGHT DIRECTOR AND RUDDER BOOST
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.
Rudder Boost — The GFC 700 incorporates the rudder boost capabilities. The rudder boost is enabled
by setting the pedestal mounted control switch, placarded RUDDER BOOST – OFF, to the RUDDER
BOOST position. The system senses bleed air pressure from both engines. When the difference in
these pressures exceeds a preset level, the yaw servo is activated and deflects the rudder to assist pilot
effort in maintaining directional control. The servo contribution is proportional to the bleed air pressure
differential. Trimming of the rudder must be accomplished by the pilot. The rudder boost system is
disabled if the RUDDER BOOST switch is OFF, or when one of the bleed air switches is in the PNEU &
ENVIR OFF position. Rudder boost is interrupted when the AP/YD DISC/TRIM INTRPT button is
pressed.
An amber caution annunciator, [RUD BOOST OFF], is provided on the caution/advisory/status
annunciator panel as illustrated below to indicate that the rudder boost system is unavailable due to the
rudder boost control switch being in the OFF position, the AP/YD DISC/TRIM INTRPT has been pressed
on either yoke, or if a fault in the rudder boost system has rendered it inoperative.
CAUTION /ADVISORY PANEL ILLUSTRATION
**RUD BOOST
OFF
RUD BOOST
OFF
**FA-226 and after, or airplanes with Raytheon Aircraft Kit P/N 130-9600 installed.