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adjustable turnbuckles at these points to align the forward
mechanism and adjust the tension in the chain and cable.
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - FORWARD CONTROL MECHANISM
EFFECTIVITY
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HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - FORWARD CONTROL MECHANISM
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - FORWARD CONTROL MECHANISM
EFFECTIVITY
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HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - FORWARD CONTROL MECHANISM
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - FORWARD CONTROL MECHANISM
EFFECTIVITY
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HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - FORWARD CONTROL MECHANISM
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The stabilizer trim cutout and column cutout switches disable
stabilizer electric trim. The stabilizer trim override switch lets
you bypass the column cutout switches.
Location
The stabilizer trim cutout switches are on the control stand. The
column cutout switches are in the forward equipment
compartment. The stabilizer trim override switch is on the
aisle stand.
Stabilizer Trim Cutout Switches
The pilot uses the stabilizer trim cutout switches to stop a
runaway electric trim condition.
Column Cutout Switches
The column cutout switches contain a set of cam-operated
switches. The cutout switches also contain two relays. When the
control column moves in the opposite direction from the
stabilizer trim direction, electric trim stops.
Stabilizer Trim Override Switch
The stabilizer trim override switch bypasses the column cutout
switches. The pilot uses this switch to operate the electric trim if
both column cutout switches fail.
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - CUTOUT SWITCHES
EFFECTIVITY
GUN ALL 27-41-00
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HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - CUTOUT SWITCHES
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - CUTOUT SWITCHES
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-41-00-006
Purpose
The horizontal stabilizer trim control system components in the
aft section of the airplane move the leading edge of the
stabilizer
Location
The horizontal stabilizer components are in section 48, aft of the
rear pressure bulkhead.
Physical Description
The horizontal stabilizer components are:
* Aft cable drum
* Gimbal (2)
* Stabilizer trim actuator
* Ball nut
* Jackscrew
* Safety rod.
The gearbox connects to the bulkhead in the fuselage by the
lower gimbal. The upper gimbal connects the ball nut to the
stabilizer front spar fitting.
The stabilizer trim actuator is a multi-speed DC motor. It
receives commands from the stab trim control switch or the
autopilot.
Functional Description - Input
The pilot or autopilot controls the stabilizer trim actuator. The
pilot also controls the aft cable drum position with the stabilizer
trim wheels. This is the priority for control of the stabilizer:
* Manual
* Electric
* Autopilot.
The jackscrew gearbox receives inputs from the stabilizer
manual trim wheel cables and the stabilizer trim actuator. The
stabilizer manual trim wheel cables turn the aft cable drum. The
aft cable drum or the stabilizer trim actuator turns gears in the
gearbox to turn the jackscrew. When the jackscrew turns, the
leading edge of the stabilizer moves. The gimbals permit fore
and aft motion of the jackscrew as the stabilizer moves.
Functional Description - Brakes
The gearbox has two internal brakes and a mechanical clutch.
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