Garmin G3X Installation Manual page 524

Manual Electric Trim Configuration
The installer needs to make the following manual electric trim configuration selections when setting up the
GSA 28 based autopilot system. These selections are made in configuration mode on the PFD under the
AP tab and the pitch gain setup screen in the autopilot setup menu in normal mode.
Table 31-10 Manual Electric Trim Autopilot Configuration Settings
Configuration Setting
Airspeed Threshold
Roll Trim Motor Speed
Pitch Trim Motor Speed
Yaw Trim Motor Speed
Motor Run Time Limit
190-01115-01 G3X/G3X Touch Installation Manual - GDU 37X Config and Post Install Checkout
Rev. AA
The GSA 28 servos are capable of airspeed scheduling the aircraft's manual
electric trim.
The Airspeed Threshold Fastest Movement setting is the airspeed in which
the trim motor will be moved at its fastest setting. This should be the lower
of the two airspeeds.
The Airspeed Threshold Slowest Movement setting is the airspeed in which
the trim motor will be moved at its slowest setting. This should be the higher
of the two airspeeds.
The GSA 28 roll servo will control the aileron trim on the aircraft.
The Roll Trim Motor Speed percentage for the Fastest Movement is the
speed in which the roll servo will run the auxiliary trim motor when at or
below the corresponding airspeed.
The Roll Trim Motor Speed percentage for the Slowest Movement is the
speed in which the roll servo will run the auxiliary trim motor when at or
above the corresponding airspeed.
The GSA 28 pitch servo will control the elevator trim on the aircraft.
The Pitch Trim Motor Speed percentage for the Fastest Movement is the
speed in which the pitch servo will run the auxiliary trim motor when at or
below the corresponding airspeed.
The Pitch Trim Motor Speed percentage for the Slowest Movement is the
speed in which the pitch servo will run the auxiliary trim motor when at or
above the corresponding airspeed.
The GSA 28 yaw servo will control the rudder trim on the aircraft.
The Yaw Trim Motor Speed percentage for the Fastest Movement is the
speed in which the roll servo will run the auxiliary trim motor when at or
below the corresponding airspeed.
The Yaw Trim Motor Speed percentage for the Slowest Movement is the
speed in which the roll servo will run the auxiliary trim motor when at or
above the corresponding airspeed.
The GSA 28 servos can limit the maximum continuous run time of the trim
motor. This can be used to help prevent the potential for a trim runaway
situation.
The Motor Run Time Limit is the maximum amount of time the trim servo will
be ran continuously when a manual electric trim input is detected. If the
maximum time is exceeded, the pilot will need to release the Manual Electric
Trim (MET) control and then reassert it to continue running trim.
Description
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