Figure 2-20, Gsa 9000 / Gsm 9100; Figure 2-21, Gra 5500 Radar Altimeter - Garmin G1000 System Maintenance Manual

2.1.21 GSA 9000 Servo and GSM 9100 Servo Gearbox
The Garmin GFC 700 AFCS uses a GSA 9000 servo to control aircraft yaw damper/turn coordination and
rudder boost. The GSA 9000 contains a motor-control and monitor circuit board, as well as a solenoid
and a brushless DC motor. The GSA 9000 servo receives serial RS-485 data packets from the GIA
63Ws. The GSA 9000 yaw servo is located in the tail. Power to the servo is received from No. 2 Triple
Fed Bus. The servo mounts to a Garmin GSM 9100 Servo Gearbox. The GSM 9100 is responsible for
transferring the output torque of the GSA 9000 servo actuator to the mechanical flight control surface
linkage.
2.1.22 GRA 5500 Radar Altimeter
The GRA 5500 Radar Altimeter is designed to calculate height Above Ground Level (AGL) of the
aircraft which is displayed on the PFDs. For King Air installations, the GRA 5500 is configured to output
the value height Above Ground Level to the pilot through the GDU. The GRA interfaces to the existing
radar altimeter antennas and GIA #2 via the ARINC 429 digital bus. The GRA 5500 is located below the
lower avionics equipment shelf in the tail section. The GRA 5500 is powered from the Right Gen
Avionics Bus.
2.1.23 Garmin G36 and 37 GPS/WAAS Antennas
This installation uses one G36 GPS/WAAS antenna and a G37 GPS/WAAS/XM antenna. The antennas
are located in the upper, forward cabin.
G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
190-00716-01

Figure 2-20, GSA 9000 / GSM 9100

Figure 2-21, GRA 5500 Radar Altimeter

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