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supplies the feel force to the pilot.
When the pilot releases the control wheels, the spring force
causes the roller to move to the center of the cam. The system
goes to the neutral trim position.
During trim operation, the aileron trim actuator moves the roller
up on the cam. The springs keep the cam in the center and the
quadrant and shaft move. This gives an input to the aileron
PCUs to move the ailerons. It also moves the control wheels
and supplies trim indication on the top of the aileron control
wheel.
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON FEEL AND CENTERING UNIT
EFFECTIVITY
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AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON FEEL AND CENTERING UNIT
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON FEEL AND CENTERING UNIT
EFFECTIVITY
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Purpose
The aileron trim switches control the electrical trim actuator.
The actuator moves the ailerons and the control wheels to a
new neutral position.
Location
The two aileron trim switches are on the aileron/rudder trim
control panel.
The aileron trim indicator placards are on the top of each
control column.
Physical Description
The aileron trim switches are between fixed guards. They are
part of the aileron/rudder trim control panel.
Functional Description
The pilot controls the aileron trim with the two switches. The
switches control the aileron trim actuator. The pilot must
operate both switches at the same time to supply power to the
trim actuator.
The aileron trim can operate at all times when electrical power
is available. The forward switch controls aileron trim direction
and sends signals to the flight data acquisition unit (FDAU). The
aft switch supplies a ground for the motor.
See the flight data recorder system section for more information
about the FDAU. (SECTION 31-31)
The aileron trim indicator placards show the amount of trim in
units. Each unit shows six degrees of control wheel rotation.
The maximum trim available is 9.5 units (57 degrees) of control
wheel rotation.
Training Information Point
There must be hydraulic pressure for the trim input to move the
ailerons.
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON TRIM ACTUATOR
EFFECTIVITY
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AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON TRIM ACTUATOR
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON TRIM ACTUATOR
EFFECTIVITY
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AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON TRIM ACTUATOR
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The aileron power control units (PCUs) supply the hydraulic
power to move the ailerons.
Location
The two PCUs are on the forward bulkhead of the main landing
gear wheel well. The upper PCU gets system B pressure and
the lower PCU gets system A pressure.
Physical Description
The PCU has these parts:
* Movable housing connected with a shaft to the aileron body
quadrants
* Fixed piston connected to structure.
The PCU housing has these parts:
* Actuator
* Filter
* Bypass valve
* Control valve
* Primary and secondary input cranks
* Primary and secondary slides
* External mechanical stops (2).
Functional Description
The ailerons move when any of these conditions occur:
* Normal operation
* System pressure failure
* Rate jam
* Manual reversion.
Normal Operation
During normal operation, an aileron input goes through the
input pogos of each PCU to its respective input cranks. The
upper and lower input cranks move slides in the control valve
and supply hydraulic pressure to the actuator.
The lower input crank connects to the primary slide and the
　
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