190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 30-121
30.4.13 Trim Configuration Page
The GSA 28 autopilot servos can be used to control the trim system in an aircraft. When the autopilot is
disengaged, the servos can adjust the trim speed based on the current aircraft airspeed. This allows the trim
to run slower at high airspeeds and faster at low airspeeds. When the autopilot is engaged in the air, the
servos can adjust the trim control to minimize the force on the primary controls. This helps make sure the
aircraft will be properly trimmed when the autopilot is later disengaged.
During the flight test phase, the trim system is configured and set up after the primary autopilot
performance has been properly configured. This is done so the pilot can focus on properly adjusting the
performance of the primary autopilot system without having the auto-trim functionality interfere.
The G3X Touch system supports DC trim motors
driven directly from pins 13, 14 of the GSA 28, or
GSA 28 trim servos
which operate independently on the CAN bus without connections to the GSA 28
pitch/roll servos. This section provides specific configuration guidance for DC trim motors
connected to
the GSA 28 servos, however, the configuration parameters are similar for the other less common method of
using GSA 28 trim servos
.
NOTE
Make sure basic autopilot functionality is properly adjusted before enabling trim control
for any servo.
NOTE
Available trim configuration items can change depending on whether trim control is
enabled for a DC motor or a Garmin servo LRU (second GSA 28), and whether the
electrical control system LRU is enabled.
Figure 30-46 Roll Trim Tab, Trim Configuration Page (ECS enabled)
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