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actuator. The trim actuator input moves the stabilizer gearbox
and stabilizer jackscrew. When the jackscrew turns, the leading
edge of the stabilizer moves. The gearbox also backdrives the
aft cable drum.
Stabilizer
The stabilizer consists of a left, right, and center section. It
pivots at a hinge point located at the aft end of the center
section. A ball nut is attached to the front spar fitting that
connects to the jackscrew. The stabilizer moves to a maximum
of 4.2 degrees leading edge up and 12.9 degrees leading edge
down.
Stabilizer Trim Limit Switches (5)
Cam operated trim limit switches control the stabilizer trim
range. When the stabilizer moves, a cam operates five limit
switches.
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General
The horizontal stabilizer trim control system components are in
the flight compartment and in the tail:
Flight Deck Components
These are the flight compartment components:
* Stabilizer trim control switches on the control wheel (2)
* Stabilizer trim wheels on the control stand (2)
* Stabilizer trim cutout switches on the control stand (2)
* Stabilizer trim override switch on control stand
* Stabilizer trim indicators (2).
Forward Equipment Compartment Components
These are the forward equipment compartment components:
* Column cutout switch (2)
* Stabilizer forward control mechanism.
Tail Components
These are the horizontal stabilizer trim control system
components in the tail area:
* Stabilizer trim actuator
* Aft cable drum
* Jackscrew
* Stabilizer ball nut and jackscrew gearbox
* Stabilizer trim limit switches
* Horizontal stabilizer.
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Purpose
The pilot uses the stabilizer forward control mechanism for
manual input.
Location
The forward control mechanism is in the flight deck and the
forward equipment compartment.
Physical Description
The forward control mechanism has these components:
* Stabilizer trim wheels on control stand (2)
* Sprocket
* Chain assembly
* Forward cable drum.
The trim wheels and the sprocket are splined to a control wheel
shaft.
Functional Description
When the pilot turns the trim wheels, this moves the sprocket
and chain and drives the forward cable drum. This moves the
cables that go to the aft cable drum. The aft cable drum moves
and drives the gearbox and jackscrew and the stabilizer.
Indication
When the forward control mechanism moves, it drives a
jackshaft through a flexible cable which transmits motion to a
linkage that positions the indicator needle.
Training Information Point
The forward cable drum is on a housing attached to structure by
two horizontal and two vertical suspension points. Use the
　
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