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moves the balance panel in the opposite direction of the aileron
movement.
As the balance tab moves, differential forces occur at the tail of
the aileron. They help the power source that moves the aileron.
These forces are always applied but they are most useful
during manual control.
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON BALANCE PANEL AND TAB
EFFECTIVITY
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AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON BALANCE PANEL AND TAB
AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON BALANCE PANEL AND TAB
EFFECTIVITY
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AILERON AND AILERON TRIM CONTROL SYSTEM - AILERON BALANCE PANEL AND TAB
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The aileron control system and the flight spoilers use cable
force input from the control wheels.
Physical Description
The aileron control system has these cables:
* ACBA and ACBB; bus drum cables
* AA and AB; left and right body cables
* ABSA and ABSB; left and right wing cables.
Two spring mechanisms isolate the aileron system from the
flight spoilers. They are the transfer mechanism and the aileron
spring cartridge.
Functional Description - Normal
When the control wheels move, the left body cables move and
control the PCUs. The PCU housing moves and controls the
aileron wing cables.
When the PCU housing moves, it also controls the right body
cables and completes the loop to the right control column. It
also controls the spoiler wing cables through the spoiler mixer.
This controls the flight spoiler actuators to move after some
control wheel movement.
Functional Description - Manual
Manual operation is almost the same as normal operation with
one difference. There is three degrees of control wheel
movement at the aileron PCUs before the input crank meets
the mechanical stops. Then the PCU housing moves, but the
pilot supplies the force.
Functional Description - One Control Cannot Move
If one control wheel cannot move, the related side cable will not
move.
If the right control wheel cannot move, the crew can only use
the left control wheel to move the ailerons normally.
If the left control wheel cannot move, the crew can only use the
right control wheel. This will move the right body cables after 12
degrees of control wheel movement. This controls the flight
spoiler actuators to move after a predetermined amount of
control wheel movement.
Functional Description - One Aileron Cannot Move
If one aileron cannot move, the shear rivets at the body
quadrants will shear and isolate this aileron. The other part of
the aileron control system operates normally.
AILERON AND AILERON TRIM CONTROL SYSTEM - CABLE SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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27-11-00-014
Functional Description - One PCU Input Cannot Move
If one PCU pogo input cannot move freely, then it compresses
or extends. The other PCU pogo still moves to the commanded
position. This equalizes pressure on both sides of the actuator.
This prevents hydraulic lock to the PCU and lets the other PCU
move it through the aileron body quadrant.
AILERON AND AILERON TRIM CONTROL SYSTEM - CABLE SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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AILERON AND AILERON TRIM CONTROL SYSTEM - CABLE SYSTEM - FUNCTIONAL DESCRIPTION
AILERON AND AILERON TRIM CONTROL SYSTEM - CABLE SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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General
The ailerons and the flight spoilers make up the lateral system.
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