G1000/GFC 700 Post Installation Checkout Procedure – Hawker / Beechcraft King Air C90
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190-00682-00
Revision 5
1.4.2
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
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 allows
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 GSA 81 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.
