GFC 600 AFCS Part 23 AML STC Maintenance Manual Page 6
190-01938-00 Revision 13
2.1.3 GSA 80/81 Servo and GSM 86 Servo Mount
The GSA 80 and GSA 81 servos contain a motor-control board and monitor circuit board, as
well as a solenoid and a brushless DC motor. The GSA 80/81 runs application software
appropriate to the axis it is installed in, as programmed by the installation straps on the servo
connector. The motor control board processes the incoming data from the GMC 605 and drives
the 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. The GSA 80/81 require a GSM 86 to interface to the
aircraft control system.
The GSM 86 is mounted to the aircraft structure and is responsible for transferring the output
torque of the GSA80/81 to the mechanical flight control surface linkage. An output capstan and
slip clutch are attached to the GSM 86 to provide interface to the flight control system. There
are various capstan and slip-clutch torque values. Refer to the model-specific installation
manual addendum for the correct part numbers. The slip clutch allows the output capstan to
rotate independently of the GSA 80/81 if sufficient torque is applied to the capstan. This allows
the pilot to override the operation of the GSA 80/81 in the event of a malfunction.
2.1.4 GI 285 Mode Annunciator Panel
The GI 285 mode annunciator panel (if installed) interfaces directly with the GMC 605 to provide
AFCS mode annunciations to the pilot (see Figure 2 2).
Figure 2-2 – GI 285
2.1.5 Audio Output
The GMC 605 has an analog audio output to an audio panel, plus an active low output to drive
an external aural alert device (e.g. sonalert). The analog audio can be interfaced to any audio
panel that has an unswitched and unmuted analog audio input. If the analog audio is interfaced
to an audio panel other than a GMA 35 or GMA 350, which has a fail-safe audio path, the
installation must also include a sonalert.
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