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units per second.
Stabilizer Trim Cut Out Switch
If there is a stabilizer runaway condition, the pilots can use the
stabilizer trim cut out switch (S272) to interrupt power to the
electric motor.
Cut Out - Elevator Column Input
When the pilot moves the elevator column out of the neutral
range, switches inside the column cutout switches open in a
direction opposite to column movement. Relays and another set
of switches allow the actuator to operate the stabilizer in the
same direction as the column movement.
The pilot uses the stab trim override switch to bypass the
column cutout switches, if both fail internally.
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - ELECTRIC TRIM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The horizontal stabilizer supplies long-term pitch control of the
airplane.
Location
The horizontal stabilizer is at the aft section of the fuselage.
Physical Description
The horizontal stabilizer assembly consists of a left and right
section attached to a center section.
Functional Description
The horizontal stabilizer moves a total of 17.1 degrees in these
directions:
* 4.2 degrees stabilizer leading edge up (airplane nose down
trim)
* 12.9 degrees stabilizer leading edge down (airplane nose up
trim).
NOTE: The maximum leading edge up and leading edge down
positions are measured from the stabilizer neutral
position (0.0 degrees or 4 units of trim). Markers on the
fuselage show the maximum leading edge up, leading
edge down, and the neutral positions.
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - STABILIZER
EFFECTIVITY
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HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - STABILIZER
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - STABILIZER
EFFECTIVITY
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Manual Operation - Stabilizer Trim Switches
The pilots operate the stabilizer trim control switches for main
electric pitch trim control. The switches are on the outboard
side of each control wheel. This gives electric input to the
stabilizer trim actuator. The motor operates and drives the
gearbox and stabilizer jackscrew. The stabilizer pivots at each
rear spar. A ball nut attached to the front spar moves the
stabilizer to a maximum of 4.2 degrees leading edge up and
12.9 degrees leading edge down.
During electric trim operation, if the pilot gives an opposite
direction elevator control input, the column switching modules
make the stabilizer electric trim stop.
Manual Operation - Stabilizer Trim Wheels
The pilots use the stabilizer trim wheels for manual pitch trim
control. The wheels are on each side of the control stand.
Operation of the stabilizer trim wheels moves a chain that
drives the forward cable drum. The forward cable drum moves
the cables connected to the aft cable drum. When the aft cable
drum moves, it drives the gearbox, jackscrew, and stabilizer.
Elevator Neutral Shift Input
　
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