The torque tubes are made of either aluminum or steel and are hollow tubes with steel end fittings. These are the four different types of torque tubes:
*
Electro-magnetically formed (EMF)
*
Riveted
*
Bolted
*
Machined.
Most of the torque tubes are EMF torque tubes. For these torque tubes, the end of the aluminum tubes are formed around the end fittings electro-magnetically.
One torque tube on each wing has end fittings riveted to the aluminum tube. Four torque tubes on each wing have end fittings bolted to the steel tubes. Six torque tubes on the airplane are machined. For the machined torque tubes, the steel tube and the end fittings are made from one piece of material.
Torque Tube Supports
There are three different types of torque tube supports. They differ in how they attach to structure. Also, one type of torque tube support has a pressure seal.
The torque tube supports are filled with grease.
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LEADING EDGE SLATS -TORQUE TUBES AND TORQUE TUBE SUPPORTS
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LEADING EDGE SLATS -ANGLE GEARBOXES
Purpose
The angle gearboxes connect torque tubes that are at different angles to each other. There are four separate angle gearboxes:
*
Two floor angle gearboxes
*
Two strakelet angle gearboxes.
Location
The floor angle gearboxes are just aft and outboard of the forward cargo compartment. Remove the cargo lining in the aft section of the forward cargo compartment to get access.
The strakelet angle gearboxes are on the inboard side of the first rib in the fixed leading edge of the wings. Remove the access panel under the inboard end of the wing to get access.
Physical Description
The angle gearboxes are filled with grease and sealed.
Both of the floor angle gearboxes are identical and both of the strakelet angle gearboxes are identical. Each gearbox weighs approximately 12 lb (5.5 kg).
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777 AIRCRAFT MAINTENANCE MANUAL
LEADING EDGE SLATS -ANGLE GEARBOXES
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LEADING EDGE SLATS -DRIVELINE OFFSET GEARBOXES
Purpose
The two driveline offset gearboxes connect torque tubes that are offset from each other.
Location
There is one driveline offset gearbox in the fixed leading edge of each wing, between the inboard slat and the krueger flap. Remove the access panel under the wings to get access.
Physical Description
The gearboxes are filled with grease and sealed.
Both of the driveline offset gearboxes are identical. Each gearbox weighs approximately 28 lb (12.7 kg).
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LEADING EDGE SLATS -DRIVELINE OFFSET GEARBOXES
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LEADING EDGE SLATS -NO-BACK BRAKE OFFSET GEARBOXES
Purpose
The no-back brake offset gearboxes get power from the torque tubes to operate the rotary actuators.
Location
The no-back brake offset gearboxes 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 no-back brake offset gearboxes for each slat. The gearboxes for the inboard slats are similar to the gearboxes for the outboard slats. The gearboxes at the outboard end of the wings are different than the other gearboxes and contain the slat position sensors.
The no-back brake offset gearbox has a no-back brake to help prevent slat retraction if the PDU or a torque tube fails. The no-back brake offset gearbox also has a shearout to prevent excessive loads on the pinion gear if the slat does not move freely.
The no-back brake offset gearboxes are filled with oil and sealed.
The no-back brake offset gearboxes for the inboard slats weigh approximately 16 lb (7 kg). The no-back brake offset gearboxes for the outboard slats weigh approximately 11 lb (5 kg).
Training Information Point
To do a check of the no-back brake in the no-back brake offset gearbox, manually apply a backdrive torque to the gearbox. To do this, remove the no-back brake cover and connect a manual drive.
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