System Description; Equipment Descriptions - Garmin G1000 Nxi System Maintenance Manual

2. SYSTEM DESCRIPTION

Equipment Descriptions

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), two GSA 80 servos
(pitch and roll), and one GSA9000 servo (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.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Page 7
Revision 1