Instruction Manual

Page 2-12 G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
Revision 4 190-00716-01
2.1.19 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 Left Gen Avionics 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 2-18, Weather Radar
2.1.20 GSA 80 Servos and GSM 86 Servo Gearboxes (3)
The Garmin GFC 700 AFCS uses GSA 80 high torque servos to control aircraft pitch, pitch trim and roll.
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 near the wing front spar. The pitch and pitch trim servos are located in the tail. Power to
the servos is received from No. 2 Triple Fed Bus. All servos mount to Garmin GSM 86 Servo Gearboxes.
The GSM 86 is responsible for transferring the output torque of the GSA 80 servo actuators to the
mechanical flight control surface linkage.
Figure 2-19, GSA 80 / GSM 86