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electric trim system
GMAS
The electric trim (servo) and the the elevator servo are different. In the port boom there is a strain guage that detects tension in the elevator cable. The trim servo tries to neutralize the elevator tention by adjusting the trim thru the trim servo. The autopilot is continually adjusting trim to neutralize tension.
The electric trim switches operate when the autopilot is disengaged. There is a voltage applied to to the servo (regulated) that moves the trim up or down. The voltage regulator has an adjustment that controls the speed. The regulator is mounted up on the left side of the centre console in a small aluminum box near the pilots knees.
When the autopilot is enguaged, an inhibit circuit stops the trim switch on the control from functioning.
The elevator servo has a limited range before the forces on the servo override the clutch. The trim servo is mandatory and standard on any pilot that has altitude hold.
fyi
Bob
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