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During normal operation, the torsion spring supplies the load
path for roll control.
Movement of the left control wheel bus drum goes through the
right aileron bus drum to the torsion spring. The torsion spring
transmits the movement to the right aileron control wheel and
shaft. Shaft movement also moves the lost motion device crank.
Movement of the right control wheel goes through the shaft to
the torsion spring. The torsion spring transmits the movement
to the right aileron control bus drum. The movement goes
through the left aileron bus drum to the left control wheel and
the left body cables.
If the right control wheel cannot move, the captain can operate
the left wheel and override the force of the torsion spring and
the force of the feel and centering mechanism. This allows
control of the ailerons only.
If the left control wheel cannot move, the first officer can operate
the right control wheel and override the force of the torsion
spring and the spring cartridge. The lost motion device engages
at 12 degrees of control wheel movement. The lost motion
device then turns the spoiler control drum and moves the right
body cables. This allows control of the flight spoilers only.
If a connection breaks, the pilot can operate the other control
wheel.
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON TRANSFER MECHANISM
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-11-00-006
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON TRANSFER MECHANISM
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON TRANSFER MECHANISM
EFFECTIVITY
GUN ALL 27-11-00
Page 21
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-11-00-006
Purpose
The aileron PCU linkage sends the aileron inputs to the aileron
PCUs.
Location
The aileron PCU linkage is on the left forward bulkhead of the
main landing gear wheel well.
Physical Description
The aileron PCU linkage includes these components:
* Control quadrant
* Autopilot input rod
* Aileron trim actuator
* Aileron feel and centering unit
* Input shaft
* Input pogo cranks (4)
* Input pogo (4).
Functional Description
The aileron input shaft receives inputs from the:
* Pilot through the aileron control quadrant
* Autopilot through the aileron autopilot input rod
* Trim switches through the aileron trim actuator.
When the shaft moves, it moves the input pogo cranks. This
moves the input pogos which control the aileron PCUs.
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON PCU LINKAGE
EFFECTIVITY
GUN ALL 27-11-00
Page 22
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-11-00-007
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON PCU LINKAGE
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON PCU LINKAGE
EFFECTIVITY
GUN ALL 27-11-00
Page 23
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-11-00-007
Purpose
The aileron feel and centering unit receives the aileron inputs
and controls the aileron PCUs. The unit gives a feel force to the
pilot. It also moves the control wheel to a neutral position when
there is no input. The aileron trim actuator changes the neutral
position of the ailerons and the control wheels.
Location
The feel and centering unit is at the bottom of the aileron input
shaft. The aileron trim actuator is on the aileron feel and
centering unit.
Physical Description
The aileron feel and centering unit has two springs, a cam, and
a roller. The cam attaches to the shaft with bolts. A cam roller
attaches to the roller arm which attaches to the support. The two
springs connect the roller with the support.
The aileron trim actuator connects to the fixed bracket and the
roller arm support. The actuator is a 115v ac, single phase,
reversible motor. The motor has limit switches, mechanical
stops at the stroke ends, and a brake. The limit switches control
the amount of trim available.
Functional Description
The centering springs hold the roller in the center of the cam.
When the control wheel moves, the cam turns with the shaft and
moves the roller up on the cam. This extends the springs and
　
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