Instruction Manual

G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air Page 2-1
190-00716-01 Revision 4
2 SYSTEM DESCRIPTION
2.1 Equipment Descriptions
2.1.1 GFC 700 Operation
The GFC 700 is a fail-passive digital flight control system composed of multiple G1000 LRUs and
servos. The following functions are provided by the GFC 700 in this installation:
• Flight Director
• Autopilot
• Pitch Trim
• Yaw Damper
• Electronic Stability and Protection (optional)
Flight Director:
The Flight Directors operate within the GIA 63Ws and use data from the G1000 system, including air,
attitude and flight data, to calculate commands for display to the pilot and for the Autopilot. Flight
director command bars and mode annunciations are sent to the PFDs through a high-speed Ethernet
connection for display to the pilot and copilot. The flight directors operate independently of the autopilot
and allow the pilot to hand-fly the command bars, if desired. The GMC 710 allows the pilot to switch the
active director between flight director #1 (GIA1) and flight director #2 (GIA2).
Autopilot:
The autopilot operates within one high-speed GSA 80 servo (pitch trim) and three GSA 80 servos (pitch,
roll and yaw). Flight director data is processed within the servos and turned into aircraft flight control
surface commands. The autopilot cannot operate unless the flight director is engaged.
Manual Electric Trim:
When the autopilot is not engaged, the pitch trim servo may be used to provide a Manual Electric Pitch
Trim (MEPT) function. This allows the pilot or co-pilot to adjust pitch trim from the PITCH TRIM
switch on the control wheel in lieu of using the elevator trim wheel. Trim speeds are scheduled to provide
easier control over a wide speed or configuration range. The PITCH TRIM switch is split into two halves.
The left half arms MEPT. The right half controls direction. Both halves must be actuated at the same time
to command the pitch trim servo to operate. If only one half of the PITCH TRIM switch is actuated for
more than 3 seconds, a red PTRM message will appear on the PFDs.
Yaw Damper:
The yaw damper reduces Dutch roll tendencies and coordinates turns. It can operate independently of the
autopilot and may be used during normal hand-flight maneuvers.
Electronic Stability and Protection:
Electronic Stability and Protection (ESP) is an optional function that is intended to assist the pilot in
maintaining the airplane in a safe flight condition within the aircraft flight envelope. This envelope is
defined by pitch, roll, and airspeed. This feature is only active when in flight and the autopilot is off.
There are two versions of the ESP option available: ESP with Angle of Attack (AOA) modes and ESP
without Angle of Attack (AOA) modes. The ESP option with AOA modes requires a new lift computer.
The ESP option without AOA modes uses the existing lift computer.
Underspeed Protection:
Underspeed Protection (USP) is available when the optional ESP system is installed and the autopilot is
on. It is designed to discourage aircraft operation below minimum established airspeeds. When the
aircraft decelerates to stall warning, the autopilot will provide input causing the aircraft to pitch down and