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is that the spoiler position sensors have two internal synchros
instead of one. Also, the spoiler position sensors send spoiler
position data to the flight control computers (FCCs) instead of
the DFDAU.
See the autoflight chapter for more information on the spoiler
position sensors and the FCCs. (CHAPTER 22)
FLIGHT SPOILER CONTROL SYSTEM - SPOILER POSITION TRANSMITTERS
EFFECTIVITY
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FLIGHT SPOILER CONTROL SYSTEM - SPOILER POSITION TRANSMITTERS
FLIGHT SPOILER CONTROL SYSTEM - SPOILER POSITION TRANSMITTERS
EFFECTIVITY
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FLIGHT SPOILER CONTROL SYSTEM - SPOILER POSITION TRANSMITTERS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The pilot uses the control wheels and speedbrake lever to
manually move the flight spoilers. The autopilot automatically
controls them.
Physical Description
The lateral control system has these spoiler cables:
* AA and AB right body cables
* WSA and WSB spoiler wing cables
* SBA and SBB speedbrake lever cables.
These are some of the aileron cables for the lateral control
system:
* ACBA and ACBB bus drum cables
* AA and AB left body cables.
Two spring mechanisms isolate the aileron system from the
flight spoilers. They are the transfer mechanism and the aileron
spring cartridge.
Functional Description - Roll Control
When the control wheels move, the left body cables move and
control the aileron PCUs. The PCU moves the body quadrant,
which moves the left and right aileron wing cables.
The aileron spring cartridge connects the body quadrant to the
spoiler control quadrant. The spoiler control quadrant supplies
the control wheel inputs to the spoiler ratio changer and mixer.
The spoiler ratio changer moves the spoiler wing cables. The
spoiler wing cables move the flight spoiler quadrants and
provide an input to the flight spoiler actuators.
When the pilot turns the control wheel clockwise, the flight
spoilers on the right wing start to move up. When the control
wheel turns more, the flight spoilers on the right wing move
more. The flight spoilers on the right wing move to their
maximum positions at 70 degrees clockwise movement.
When the pilot turns the control wheel counter clockwise, the
left flight spoilers move the same as described for the right
flight spoilers.
There is no manual reversion for the spoilers.
Functional Description - One Control Wheel Cannot Move
If one control wheel cannot move, the related cable side will not
move.
If the right control wheel cannot move, the spoiler control
quadrant cannot move. When the pilot moves the left control
wheel, the aileron spring cartridge compresses or extends. This
prevents flight spoiler movement.
FLIGHT SPOILER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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If the left control wheel cannot move, the crew can only use the
right control wheel. The right body cables do not move until 12
degrees of control wheel movement. The aileron spring
cartridge compresses or extends and lets the right body
cables move the spoiler control quadrant. The spoiler mixer
moves the spoiler wing cables and the flight spoilers start to
move.
Functional Description - Speedbrake Control
When the pilot moves the speedbrake lever, the speedbrake
lever cables move a quadrant in the spoiler ratio changer. The
spoiler ratio changer moves the spoiler wing cables. The flight
spoilers start to move up after 5 degrees of speedbrake lever
movement. The flight spoilers on each wing move
symmetrically.
When the speedbrake lever moves more, the flight spoilers on
both wings move more. When the speedbrake lever is in the
flight detent, flight spoilers 2, 3, 10, and 11 move to 19.5 degrees.
When the speedbrake lever is at the UP position, these spoilers
move to a maximum of 33 degrees.
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