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stabilizer position sensors A and B. (SECTION 22-11)
Column Cutout Switches
The column cutout switches stop the stabilizer trim actuator
when the pilot moves the control column in a direction opposite
to the trim direction.
Stabilizer Trim Override Switch
The pilots use the stabilizer trim override switch on the aisle
stand to bypass the column cutout switches if one or both fail.
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - GENERAL DESCRIPTION 1
EFFECTIVITY
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Stabilizer Trim Cutout Switches
The pilots use the stabilizer trim cutout switches on the control
stand to stop the main electric and autopilot runaway trim inputs
to the stabilizer trim actuator.
Flaps Up Switch
The flaps up switch controls the main electric operation speed
of the stabilizer trim actuator. The autopilot electric control of
the stabilizer trim actuator does not go through the flaps up
switch.
Stabilizer Trim Limit Switches
The stabilizer trim limit switches limit the range of stabilizer
motion.
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - GENERAL DESCRIPTION 1
EFFECTIVITY
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HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - GENERAL DESCRIPTION 1
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - GENERAL DESCRIPTION 1
EFFECTIVITY
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HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - GENERAL DESCRIPTION 1
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
These are the components of the horizontal stabilizer trim
control system:
* Stabilizer trim control switches (4)
* Stabilizer trim wheels (2)
* Stabilizer column cutout switches (2)
* Stabilizer forward cable drum
* Stabilizer trim control cables
* Stabilizer aft cable drum
* Stabilizer gearbox, jackscrew, and electric trim actuator
* Stabilizer
* Stabilizer trim limit switches (5)
* Stabilizer trim override switch.
Stabilizer Trim Control Switches
The pilots operate the stabilizer trim control switches for main
electric pitch trim control. This gives electric input to the
stabilizer trim actuator.
Stabilizer Trim Wheels
The pilots use the stabilizer trim wheels for manual pitch trim
control. The stabilizer trim wheels move a chain that drives the
forward cable drum.
Stabilizer Trim Cutout Switches
Pilots use the main electric or autopilot stabilizer trim cutout
switches to stop the stabilizer trim actuator if there is an
uncommanded motion or runaway of the trim actuator.
Stabilizer Column Cutout Switches
During electric trim operation, if the pilot gives an opposite
direction to elevator control input, the column switching
modules make the stabilizer electric trim stop. If either of the
column cutout switches fail, the stabilizer trim override switch
allows operation of the stabilizer trim control switches.
Stabilizer Forward Control Cable Drum
The forward cable drum moves the cables connected to the aft
cable drum.
Stabilizer Trim Control Cables
The stabilizer trim control cables connect the forward control
cable drum and aft cable drum together. Input from the electric
trim operation moves the aft cable drum, which backdrives the
forward control cable drum through the trim control cables.
Manual input from the stabilizer trim wheels, moves the aft
cable drum through the forward control cable drum and trim
control cables.
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - GENERAL DESCRIPTION 2
EFFECTIVITY
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Stabilizer Aft Cable Drum
The aft cable drum input moves the gearbox, jackscrew,
stabilizer and forward control cable drum.
Stabilizer Gearbox, Jackscrew, and Electric Trim Actuator
Input from the stabilizer trim switches control the stabilizer trim
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