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CAUTION:  DO NOT REMOVE THE OFFSET GEARBOX IF IT HAS A BROKEN SHEAROUT UNTIL YOU REPLACE THE SHEAROUT. THE NO-BACK BRAKE CAN HOLD A HIGH TORQUE AFTER THE FAILURE OF THE SHEAROUT. YOU CAN CAUSE DAMAGE TO THE ROTARY ACTUATOR AND OFFSET GEARBOX.
If you do a check or replace the shearout in the no-back brake offset gearbox, you must drain all the oil in the gearbox. Then remove the shearout cover to gain access to the shearout.
The no-back brake offset gearbox contains oil and it is necessary to do servicing at specified times. Use the oil fill plug.

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LEADING EDGE SLATS -NO-BACK BRAKE OFFSET GEARBOXES

EFFECTIVITY BEJ ALL  27-81-00 
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LEADING EDGE SLATS -ROTARY ACTUATORS

Purpose

The rotary actuators get power from the no-back brake offset gearboxes to turn the pinion gears.
Location

The rotary actuators are in the fixed leading edge of the wings. Remove the access panels under the leading edge of the wings
to get access. 
Physical Description 
There are two rotary actuators actuators for the inboard slats actuators for the outboard slats.  for are  each similar  slat.  to  The the  rotary rotary 

The rotary actuators are filled with grease and sealed.

The rotary actuators for the inboard slats weigh approximately 14 lb (6 kg). The rotary actuators for the outboard slats weigh approximately 6.8 lb (3 kg).
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777 AIRCRAFT MAINTENANCE MANUAL

 

LEADING EDGE SLATS -ROTARY ACTUATORS

EFFECTIVITY BEJ ALL  27-81-00 
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D633W101-BEJ  Jan 05/2002 

 

LEADING EDGE SLATS -PINION GEARS AND SLAT MAIN TRACKS

Purpose

The pinion gears receive power from the rotary actuators to move the slat main track. The slat main tracks move the slats.
Location

The pinion gears and main tracks are in the fixed leading edge of the wings. Remove the access panel under the leading edge of the wings to get access.
Pinion Gears

There are two pinion gears for each slat surface. The pinion gears for the inboard slats are different than the pinion gears for the outboard slats.
The pinion gears weigh approximately 4 lb (2 kg) for the outboard slats and 11 lb (5 kg) for the inboard slats.
Slat Main Track

There are three slat main tracks (only two are driven by rotary actuators) for each inboard slat and two slat main tracks for each outboard slat. The slat main tracks for the inboard slats are different than the slat main tracks for the outboard slats.
The slat main tracks have stops at both ends to prevent over-travel of the slat surface. During normal slat operation, the main track does not touch the stops.
Training Information Point
The center main track of the inboard slats does not have stops. Make sure that you hold the center main track so it does not fall when you remove the inboard slat.

EFFECTIVITY BEJ ALL  27-81-00 
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LEADING EDGE SLATS -PINION GEARS AND SLAT MAIN TRACKS

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LEADING EDGE SLATS -AUXILIARY ARM AND TRACK

Purpose

The auxiliary arm and track control the rotation of the inboard slats as the slats extend.
There are three auxiliary arms and tracks for each inboard slat. The outboard slats do not use auxiliary arms or tracks.
Location

The auxiliary arms attach to the slats. The auxiliary tracks are in the fixed leading edge of the wings. Remove the access panels under the wing to get access.
Physical Description

The auxiliary arms have rollers which move in grooves in the auxiliary tracks. As the slats move, the auxiliary arms force the slats to rotate.
EFFECTIVITY BEJ ALL  27-81-00 
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LEADING EDGE SLATS -AUXILIARY ARM AND TRACK

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LEADING EDGE SLATS -INBOARD AND OUTBOARD SLATS

Purpose

The inboard and outboard slats increase the lift of the wing during takeoff and landing. They are retracted during cruise.
Physical Description

The inboard and outboard slats are made of aluminum skins and ribs with an aluminum honeycomb trailing edge wedge.
The dimensions of the inboard slats are approximately 221 inches by 32 inches (5.6 m by 0.81 m). The inboard slat weighs approximately 208 lb (95 kg).
　
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