190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 16-1
16 GSA 28 (AUTOPILOT SERVO) INSTALLATION
This section contains general information as well as installation information for the GSA 28 Servo
Actuator. Use this section to mount the GSA 28 unit.
Figure 16-1 GSA 28 Unit View
16.1 Equipment Description
NOTE
There is no TSO/ETSO applicable to the GSA 28.
The GSA 28 servo is an autopilot servo intended for use in non FAA certified aircraft, including light sport
and home-built aircraft. The servo is intended to be used as part of the G3X™ avionics system.
The function of the GSA 28 is to drive a flight-control axis (pitch, roll) of the aircraft. The servo can also
be installed in the rudder control system to provide yaw damping. Trim drive support is available for any
axis using various 3rd party (i.e. Ray Allen) trim motors. The GSA 28 can also be used as the trim actuator
in the pitch and/or roll axis. All configurations can be used with or without auto-trim in each axis.
• Roll autopilot only
• Pitch/roll autopilot
• Pitch/roll autopilot with yaw damper
The GSA 28 servo features an advanced brushless DC motor and gearbox, with an engagement clutch to
allow for very low-friction operation of the aircraft flight controls with clutch disengaged. The GSA 28
performs continuous internal monitoring and fault detection, and can also safely be back-driven by the
pilot in the event of an engagement clutch fault condition. An advanced electronic slip clutch provides the
ability for the pilot to overpower the servo at a configurable torque threshold without requiring use of a
consumable shear pin or additional moving parts.
NOTE
The GSA 28 engagement clutch is actuated by an internal solenoid. An audible clicking
sound when the servo is engaged or disengaged is normal and expected.
Under normal conditions, the GSA 28 servo operates based on flight director commands from the G3X
display units (GDU™ 370/375/460/465 display). When used with an optional GMC Mode Controller, the
GSA 28 maintains a reversionary capability to engage and fly the aircraft in basic wings-level and altitude-
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