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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-001
ELEVATOR AND TAB CONTROL SYSTEM - INTRODUCTION
ELEVATOR AND TAB CONTROL SYSTEM - INTRODUCTION
EFFECTIVITY
GUN 001-099, 101-115 27-31-00
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-001
ELEVATOR AND TAB CONTROL SYSTEM - INTRODUCTION
ELEVATOR AND TAB CONTROL SYSTEM - INTRODUCTION
EFFECTIVITY
GUN 201-999 27-31-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-001
THIS PAGE IS INTENTIONALLY LEFT BLANK
ELEVATOR AND TAB CONTROL SYSTEM - INTRODUCTION
27-31-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The pilot controls the elevators manually. The autopilot system
controls them automatically.
Manual Operation - Control Columns
The pilot moves the control column forward or aft to control the
pitch attitude of the airplane. The control column gives a
mechanical input to the elevator power control unit (PCU)
through cables and linkages to the input torque tube. The input
torque tube gives input to the elevator pogos. The pogos give
input to the elevator PCUs that use hydraulic pressure to
mechanically move the elevator through the output torque tube.
When the control column moves, it also gives an input to the
pitch control wheel steering (CWS) force transducers, and
control column position sensors. The pitch CWS force
transducers send signals to the flight control computers
proportional to control column forces. The control column
sensors send control column position to the flight data
acquisition unit (FDAU).
Movement of the feel and centering unit also gives an input to
the elevator neutral shift sensor. The elevator neutral shift
sensor sends signals to the flight control computers (FCC)
proportional to the relative position of the elevator and
stabilizer.
Movement of the elevators also gives an input to the elevator
surface position sensor and position transmitters. The elevator
surface position sensor sends signals to the FCCs proportional
to the elevator position. The elevator position transmitters send
elevator position to the FDAU.
See the digital flight control system section for more information
about the pitch CWS force transducers, the elevator neutral shift
sensor, the elevator surface position sensor, and FCCs.
(SECTION 22-11)
See the flight data recorder section for more information about
the control column sensors, elevator position transmitters, and
the FDAU. (SECTION 31-31)
Autopilot Operation
When you engage the autopilot, the autopilot system uses FCC
inputs to control the autopilot actuators. When the autopilot
actuators move, they give a mechanical input to the elevator
PCUs.
See the digital flight control system section for more information
about the autopilot. (SECTION 22-11)
ELEVATOR AND TAB CONTROL SYSTEM - GENERAL DESCRIPTION 1
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-31-00-002
Autopilot Operation - Mach Trim Actuator
The mach trim actuator moves the elevators to prevent nose
down forces at high air speeds. The FCCs control the mach trim
actuator. When the mach trim actuator moves, it gives a
mechanical input to the elevator PCUs through the feel and
centering unit.
See the digital flight control system section for more information
about the mach trim actuator. (SECTION 22-11)
FCC Operation - Neutral Shift
The FCC controlled neutral shift function uses the mach trim
actuator, through the feel and centering unit to move the
elevator to a new neutral position. This gives more airplane
nose up control during takeoff and landing.
Stabilizer Operation - Neutral Shift
The stabilizer neutral shift function causes the elevators to
move when the stabilizer moves. When the stabilizer moves, it
gives a mechanical input to the elevator PCUs through the mach
trim actuator, and the feel and centering unit.
See the horizontal stabilizer trim control section for more
information about the elevator neutral shift functional
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