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* Auxiliary arm
* Detent arm
* Torsion rod.
When the LE slat moves, a roller in the auxiliary arm moves in
the auxiliary track. When the LE slat moves to the extend
position, the roller moves the detent arm down, then stops in
the cam of the detent arm. The torsion rod keeps the roller in the
cam. This keeps the LE slat in the extend position.
When the LE slat moves from the extend position to the full
extend or retract positions, the force from the slat actuator
causes the slat to move. This causes the roller in the auxiliary
arm to move the detent arm down, and the LE slat continues to
move.
LE FLAP AND SLAT CONTROL SYSTEM - MAIN AND AUXILIARY TRACKS
EFFECTIVITY
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LE FLAP AND SLAT CONTROL SYSTEM - MAIN AND AUXILIARY TRACKS
LE FLAP AND SLAT CONTROL SYSTEM - MAIN AND AUXILIARY TRACKS
EFFECTIVITY
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LE FLAP AND SLAT CONTROL SYSTEM - MAIN AND AUXILIARY TRACKS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The LE flaps and slats increase the lift of the wing during takeoff
and landing. They retract during cruise.
Location
The LE flaps are below the leading edge of the wings, between
the fuselage and the engines. The LE slats are on the leading
edge of the wings, outboard of the engines.
Physical Description
The LE flaps and slats are made of aluminum skins and ribs.
The dimensions of each LE flap are approximately 65 inches by
12 inches (1.7 m by 0.3 m). The LE flaps are not
interchangeable.
The dimensions of each LE slat are approximately 117 inches
by 18 inches (3.0 m by 0.5 m). The LE slats are not
interchangeable.
Functional Description
The LE flaps have two positions: retract and extend. The LE
flaps are at the retract position when the flap lever is in the 0
detent. The LE flaps are at the extend position when the flap
lever is at any other detent.
The LE slats have these three positions:
* Retract
* Extend
* Full extend.
The LE slats are at the retract position when the flap lever is in
the 0 detent.
* The LE slats are at the extend position when the flap lever is
in the 1, 2, or 5 detents.
* The LE slats are at the full extend position when the flap
lever is in the 30 detent.
Training Information Point
It is not necessary to use a spreader bar to lift the LE slats.
The table below describes the conditions where the LE flaps or
slats hit the engine fan cowls, thrust reversers, or thrust
reverser C duct cowls.
Item Condition Result
Inbd fan cowl Open LE flaps hit at extend
Otbd fan cowl Open No contact with LE slats
Inbd T/R Deployed LE flaps slide on deflector
during LE retraction and
extension
Otbd T/R Deployed No contact with LE slats
Inbd T/R cowl Raised LE flaps hit at extend
Otbd T/R cowl Raised LE slats hit at extend
LE FLAP AND SLAT CONTROL SYSTEM - LE FLAPS AND LE SLATS
EFFECTIVITY
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27-81-00-014
CAUTION: MAKE SURE THE INBOARD FAN DUCT COWL AND
THE THRUST REVERSERS ARE CLOSED OR
REMOVED BEFORE YOU EXTEND THE LE FLAPS
AND SLATS. THERE IS NOT SUFFICIENT
CLEARANCE FOR THE LE FLAPS AND SLATS TO
EXTEND IF THE INBOARD FAN DUCT COWL AND
THE THRUST REVERSERS ARE IN THE OPEN
(MAINTENANCE) POSITION. THIS CAN CAUSE
DAMAGE TO EQUIPMENT.
LE FLAP AND SLAT CONTROL SYSTEM - LE FLAPS AND LE SLATS
EFFECTIVITY
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LE FLAP AND SLAT CONTROL SYSTEM - LE FLAPS AND LE SLATS
LE FLAP AND SLAT CONTROL SYSTEM - LE FLAPS AND LE SLATS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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