Electric Elevator Trim System - Cessna TR182 1979 Pilot Operating Handbook

PILOT'S OPERATING HANDBOOK
SUPPLEMENT
ELECTRIC ELEVATOR
TRIM SYSTEM
MODEL TR182
SUPPLEMENT
ELECTRIC ELEVATOR
TRIM SYSTEM
SECTION 1
GENERAL
The electric elevator trim system provides a simple method of reliev-
ing pitch control pressures without interrupting other control operations
to adjust the manual elevator trim wheel. The system is controlled by a
slide-type trim switch on the top of the left control wheel grip and a
disengage switch located on the upper left side of the control wheel pad.
Pushing the trim switch to the forward position, labeled DN, moves the
elevator trim tab in the "nose down" direction; conversely, pulling the
switch aft to the UP position moves the tab in the "nose up" direction. When
the switch is released, it automatically returns to the center off position,
and elevator trim tab motion stops. The disengage switch, labeled ELEC
TRIM DISENGAGE, disables the system when placed in the DISENGAGE
(aft) position.
A servo unit (which includes a motor and chain-driven, solenoid-
operated clutch) actuates the trim tab to the selected position. When the
clutch is not energized (trim switch off) the electric portion of the trim
system freewheels so that manual operation is not affected. The electric
trim system can be overridden at any time by manually rotating the
elevator trim wheel, thus overriding the servo that drives the trim tab.
SECTION 2
LIMITATIONS
The following limitation applies to the electric elevator trim system:
1. The maximum altitude loss during an electric elevator trim
malfunction may be as much as 300 feet.
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