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SWS - SMYD - TRAINING INFORMATION POINT - SMYD BITE - OTHER FUNCTIONS
27-41-00
Page 1
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The horizontal stabilizer controls the pitch trim of the airplane
about the lateral axis.
Location
The horizontal stabilizer is on the aft section of the fuselage.
Trim Control
The pilots manually control the position of the horizontal
stabilizer with the stabilizer trim switches. Also, the pilots can
use the stabilizer trim wheels on each side of the control stand.
When the autopilot engages, it controls the position of the
horizontal stabilizer. During autopilot or main electric operation,
the actuator backdrives the stabilizer trim wheels.
Abbreviations and Acronyms
* apl - airplane
* actr - actuator
* A/P - autopilot
* A/S - airspeed
* C/W - control wheel
* cntl - control
* DFCS - digital flight control system
* FCC - flight control computer
* FDAU - flight data acquisition unit
* gnd - ground
* LE - leading edge
* MLG - main landing gear
* NLG - nose landing gear
* PCU - power control unit
* S/B - speedbrake
* sec - section
* SOV - shutoff valve
* sw - switch
* stab - stabilizer
* TE - trailing edge
* vlv - valve
* xfer - transfer
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - INTRODUCTION
EFFECTIVITY
GUN ALL 27-41-00
Page 2
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-41-00-001
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - INTRODUCTION
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - INTRODUCTION
EFFECTIVITY
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Page 3
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-41-00-001
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - INTRODUCTION
HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - INTRODUCTION
EFFECTIVITY
GUN 201-999 27-41-00
Page 4
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-41-00-001
General
The pilots control the horizontal stabilizer manually by the
stabilizer trim wheels or electrically by the stabilizer trim
switches. The autopilot controls the stabilizer automatically
through the digital flight control system (DFCS).
Manual Operation - Stabilizer Trim Wheels
The pilots use the stabilizer trim wheels on the control stand to
manually move the forward and aft cable drums. The aft cable
drum moves the gearbox and jackscrew. When the jackscrew
moves, the horizontal stabilizer moves. The stabilizer also
gives a mechanical input to the elevator, through the neutral
shift rods. Movement of the manual trim wheels also moves the
stabilizer indicator pointer.
Electric Operation - Stabilizer Trim Switches
The pilots operate two stabilizer trim switches for main electric
trim control. The switches are on the outboard side of each
control wheel. The switches control electric input to the
stabilizer trim actuator and send signals to the flight data
acquisition unit (FDAU). When the trim actuator operates, it
moves the stabilizer gearbox. When the stabilizer gearbox
moves, it moves the stabilizer jackscrew which moves the
horizontal stabilizer. The gearbox also back drives the stabilizer
aft and forward cable drums. Movement of the forward cable
drum moves the manual trim wheels and stabilizer indicator
pointer. Limit switches control the main electric and autopilot
movement of the stabilizer.
See the digital flight recorder system section for more
information about the stabilizer position sensor A and the
FDAU. (SECTION 31-31)
Autopilot Operation
The DFCS gives electric input to the stabilizer trim actuator.
During autopilot operation, the stabilizer trim actuator operates
at different speeds than during manual electric operation.
Stabilizer position sensors A and B send signals to the flight
control computers (FCCs) in the DFCS. Stabilizer position
sensor A sends stabilizer position to FCC A and the FDAU.
Stabilizer position sensor B sends stabilizer position to FCC B.
See the digital flight control system section for more information
on the stabilizer autopilot operation, the FCCs, and the
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