190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 16-8
The 011-02951-00 stop bracket kit is supplied with four #4-40 screws used to attach the bracket to the
front face of the servo. The screws provided are 0.25” long. This length of screw is appropriate if there is
no bracket or spacers in-between the stop bracket and servo. If a mounting bracket or spacers of thickness
.040” or greater will be place in-between the stop bracket and servo, longer screws should be used to
mount the stop bracket. It is recommended the thread engagement into the GSA 28, as measured from the
front face of the servo shall be 0.112” – 0.25”. If screws other than what is provided will be used, be sure to
use thread locking compound or a proper thread locking patch combined with the lock washers provided.
Also be sure to follow the recommended tightening torque specified in Figure 16-8.2
.
CAUTION
If screws are being used to mount the stop bracket to the front face of the GSA 28 are
different than the screws provided with the stop bracket kit, care must be taken to make
sure these screws are not long enough to contact moving parts inside the GSA 28.
Maximum screw insertion, as measured from the front of the
GSA 28, must be less than 0.25” to avoid contact with parts inside the GSA 28.
CAUTION
To avoid the possibility of contaminating the internal rotating mechanisms of the GSA 28,
do not apply thread locking compound directly to the stop bracket attachment holes in the
front face of the servo. Instead, apply a small
amount of thread locking compound to the
threads of the stop bracket screws before the screws are inserted. Thread locking
compound is not required upon initial installation of the included stop bracket screws,
which are supplied with thread locking compound already applied.
16.5.2.3 Trim Motor Interface to a 3rd Party Motor
The GSA 28 provides an optional interface between the pilot's electric trim switch and a 14 Vdc trim
motor. This interface shall be used only when interfacing to a 3rd party trim motor. This interface is not to
be used when a GSA 28 is being used as the trim actuator.When the GSA 28 servo is engaged (i.e.
autopilot on) in the air, it automatically drives the connected trim motor as required to relieve control
forces for the associated pitch, roll, or yaw axis. When the GSA 28 servo is not engaged (i.e. autopilot off),
it provides manual electric trim (MET) functionality by running the trim motor in response to pilot input.
The GSA 28 can be configured to automatically reduce the speed of the trim motor at higher airspeeds, in
order to provide finer control of trim tab position. In the event that power to the GSA 28 is removed, a fail-
safe system connects the trim input switch directly to the trim motor. In this condition, the trim switch
powers the trim motor directly and the motor runs at its full speed when the switch is pressed. The same
condition also occurs if a trim switch and motor are connected to the GSA 28, but the trim control function
is disabled.
CAUTION
The GSA 28 can supply a maximum of 1 Amp of current to the trim motor. Do not connect
a trim motor that requires higher current.
NOTE
The GSA 28 supports a single trim switch input only. For use with multiple trim switches
(e.g. pilot and co-pilot), a GAD 27 or other third-party device capable of mixing multiple
trim switches into one is required. See Figure 24-1.10
for additional details.
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