Figure 2-21, Servo; Figure 2-22, Gsa 9000 / Gsm 9100; Figure 2-23, Gra 5500 Radar Altimeter - Garmin G1000 Nxi System Maintenance Manual

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.
GRA 5500 Radar Altimeter
The GRA 5500 Garmin Radar Altimeter is designed to calculate the 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 or RS-
422 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.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1

Figure 2-21, Servo

Figure 2-22, GSA 9000 / GSM 9100

Figure 2-23, GRA 5500 Radar Altimeter

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