The inboard slat is between the fuselage and the engine, along the leading edge of the wing.
The outboard slats are outboard of the engines, along the leading edge of the wing.
Functional Description
The slats have three positions: up, sealed, and gapped. At the up position, the slats are fully retracted. At the sealed position, the trailing edge of the slats touches the leading edge of the wings.
At the gapped position, there is a gap between the trailing edge of the outboard slats and the leading edge of the wings. When the inboard slat is in the gapped position, there is a very small gap at the outboard end of the slat, and no gap at the inboard end.
Training Information Point
It is not necessary to use a spreader bar to lift the slats.
WARNING: MAKE SURE THE THRUST REVERSER COWLS ARE NOT FULLY OPEN WHEN YOU OPERATE THE FLAPS AND SLATS. THE SLATS CAN HIT THE THRUST REVERSER COWLS IF THEY ARE OPEN. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
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LEADING EDGE SLATS -INBOARD AND OUTBOARD SLATS
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LEADING EDGE SLATS -KRUEGER FLAP OFFSET GEARBOX, TORQUE TUBE, AND ROTARY ACTUATOR
General
The krueger flaps seal the gap between the inboard slat and the engine strut. This increases the effect of the slats. There is one krueger flap offset gearbox, torque tube, and rotary actuator for each krueger flap.
Location
The krueger flap is between the inboard slat and the engine strut, along the leading edge of each wing. The krueger flap actuation assembly is in the fixed leading edge of the wings, between the engine and the inboard slat. Remove the access panel on the upper side of the wing or extend the slats to get access.
Krueger Flap
The krueger flaps are made of aluminum skins and aluminum castings. The width of the krueger flaps is approximately 30 inches (0.76 m) and it weighs approximately 19 lb (9 kg).
The krueger flap has two positions: retracted and extended. It moves to the extended position when the slats are in the sealed or gapped positions. It moves to the retracted position when the slats are at the up position.
Offset Gearbox
The offset gearbox connects to the slat drive torque tubes. Gears in the offset gearbox transmit the power from the torque tubes to the rotary actuator.
The offset gearbox is filled with grease and sealed. The offset gearbox weighs approximately 8 lb (4 kg).
Torque Tube
The torque tube transmits the power from the gearbox to the rotary actuator.
The end fittings are bolted on to the ends of the torque tube.
Rotary Actuator
The offset gearbox turns the rotary actuator. The rotary actuator moves the krueger flap mechanism.
The rotary actuator is filled with grease and sealed. The rotary actuator weighs approximately 6 lb (3 kg).
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LEADING EDGE SLATS -KRUEGER FLAP OFFSET GEARBOX, TORQUE TUBE, AND ROTARY ACTUATOR
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LEADING EDGE SLATS -KRUEGER FLAP MECHANISM
Purpose
The krueger flap mechanism moves the krueger flap.
Location
The krueger flap mechanism is in the fixed leading edge of the wings, between the engine and the inboard slat. Remove the access panel on the upper side of the wing to get access.
Functional Description
There is one krueger flap mechanism for each krueger flap.
The krueger flap mechanism attaches to the rotary actuator. As
the rotary actuator rotates, the links in the krueger flap
mechanism move. These links force the krueger flap to
extend or retract.
As the slats extend to the sealed position, the krueger flap moves to the extended position. As the slats extend to the gapped position, the geometry of the links in the krueger flap mechanism prevent more movement of the krueger flap.
Training Information Point
When you rig the LE slat system, preload the krueger flap rotary actuator with the slats in the retracted position.
Adjust the stop pin to align the krueger flap with the leading edge of the wing.
EFFECTIVITY BEJ ALL 27-81-00
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