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Page 2-10 LMM for the Kodiak 100
190-02102-00 Rev.4
2.2.17 GSA 80/81 Servo Actuator
The GSA 80/81 Servo Actuators are electromechanical units that provide automatic
control of a single flight axis (pitch, roll, or yaw) and/or their associated trims. The units
contain a motor-control and monitor circuit board, as well as a solenoid and a brushless
DC motor, all enclosed in an extruded aluminum housing.
The units receive serial RS-485 data packets from two GIA integrated avionics units,
which contain data from the flight director, the GRS 79 AHRS. The motor control board
processes this incoming data and drives the brushless motor as necessary to obtain the
desired aircraft response. The monitor board independently monitors the servo speed,
monitors the output torque, and controls the engagement of the drive-clutch solenoid.
2.2.18 GSM 86 Servo Mount
The GSM 86 Servo Gear Box is mounted to the aircraft structure via a custom mounting
bracket, and is responsible for transferring the output torque of the GSA 80/81 servo
actuator to the mechanical flight control surface linkage. The GSM 86 houses its internal
components within a cast aluminum housing. The slip clutch is available in a variety of
slip torque settings, and in three different lengths, depending on the setting (short,
medium, and long). The clutch cannot be set once manufactured; therefore, it is obtained
with the proper setting.
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