Instruction Manual

G1000 / GFC 700 System Maintenance Manual - 200/B200 Series King Air Page 2-11
190-00915-01 Revision 9
Figure 2-16, GTS Traffic Processor
2.1.18 Weather Radar
The GWX 68 or optional GWX 70 Airborne Weather Radar provides weather radar data output to the
GDU 1500 MFD. The GWX is mounted forward of the forward bulkhead at F.S. 30. Power to the GWX
is received from the Avionics No. 1 bus. Data received from the GWX is routed through the GDL 69A
data link unit to the MFD via high-speed data bus (Ethernet).
Figure 2-17, Weather Radar
2.1.19 GSA 80 Servos and GSM 85A/86 Servo Gearboxes (4)
The Garmin GFC 700 AFCS uses GSA 80 high torque servos to automatically control aircraft pitch, roll,
yaw damper/turn coordination and pitch trim. The pitch trim variant of the GSA 80 is a high speed servo
actuator. The GSA 80 contains a motor-control and monitor circuit board, as well as a solenoid and a
brushless DC motor. The GSA 80 servo receives serial RS-485 data packets from the GIA 63Ws. The
roll servo is located in the forward cabin lower fuselage at F.S. 185. The pitch, yaw, and pitch trim servos
are located in the tail. Power to the servos is received from the avionics No. 2 bus. All servos mount to a
Garmin GSM 85A or GSM 86 Servo Gearbox. The GSM 85A/86 is responsible for transferring the
output torque of the GSA 80 servo actuators to the mechanical flight control surface linkage. The GSM
85A has a slip clutch that can be adjusted to a desired torque value. The GSM 86 has a clutch cartridge
that cannot be adjusted to a different torque value.
Figure 2-18, Servo