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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-09-00-007
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27-11-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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 ailerons control the flight attitude of the airplane about the
longitudinal axis.
Location
The ailerons are on the wing outboard trailing edge.
Roll Control
During roll control, the aileron on one wing moves up, and the
aileron on the other wing moves down.
The pilots turn the control wheels to control roll manually. When
engaged, the autopilot automatically controls the ailerons.
During autopilot operation, actuators give inputs to move the
control wheels.
The flight spoilers also supply roll control.
See the flight spoiler control system section for more
information on the spoiler and speedbrake control.
(SECTION 27-61)
Abbreviations and Acronyms
* A/P - autopilot
* A/S - airspeed
* C/W - control wheel
* CWS - control wheel steering
* FCC - flight control computer
* FDAU - flight data acquisition unit
* LE - leading edge
* MLG - main landing gear
* NLG - nose landing gear
* PCU - power control unit
* S/B - speedbrake
* SOV - shutoff valve
* STAB - stabilizer
* TE - trailing edge
* xfer - transfer
AILERON AND AILERON TRIM CONTROL SYSTEM - INTRODUCTION
EFFECTIVITY
GUN ALL 27-11-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
27-11-00-001
AILERON AND AILERON TRIM CONTROL SYSTEM - INTRODUCTION
AILERON AND AILERON 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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
27-11-00-001
AILERON AND AILERON TRIM CONTROL SYSTEM - INTRODUCTION
AILERON AND AILERON TRIM CONTROL SYSTEM - INTRODUCTION
EFFECTIVITY
GUN 201-999 27-11-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
27-11-00-001
General
The pilots use the aileron control wheels to move the ailerons
and flight spoilers. The autopilot, when engaged, automatically
controls them.
Manual Operation - Control Wheels
The flight crew uses two conventional control wheels to control
the roll attitude of the airplane. A transfer mechanism on the
first officer side, supplies a mechanical link between the control
wheels. If one control wheel cannot move, the other continues
to control.
The control wheel gives mechanical input to the power control
unit (PCU) through cables and linkages. Hydraulic pressure
goes to the PCU and makes the housing move. The aileron PCU
movement mechanically moves the aileron through the wing
cables and the quadrant.
When the control wheel moves, it also gives a mechanical input
to the roll control wheel steering (CWS) force transducer and
the control wheel position sensor. The roll CWS force
transducer sends signals to the flight control computers (FCC)
proportional to control wheel turning forces. The control wheel
position sensor sends signals to the flight data acquisition unit
(FDAU) for control wheel position.
See the digital flight control system section for more information
about the FCCs and the roll CWS force transducer.
(SECTION 22-11)
See the flight data recorder section for more information about
the aileron control wheel position sensor and FDAU.
(SECTION 31-31)
Manual Operation - Control Wheels - Manual Reversion
During manual reversion, the control wheel gives mechanical
input to the power control unit (PCU) through cables and
linkages. Mechanical stops in the PCU make the housing move.
The aileron PCU movement mechanically moves the aileron
through the wing cables and the quadrant.
Manual Operation - Aileron Trim
The aileron trim switches and the trim actuator let the flight
crew trim out unwanted control wheel forces. When the pilots
move the aileron trim switches on the aileron/rudder trim panel,
the switches send a signal to the aileron trim actuator and
FDAU. The trim actuator moves the feel and centering unit. This
movement goes to the aileron PCU. Aileron PCU movement
mechanically moves the aileron through the wing cables and
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