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777 AIRCRAFT MAINTENANCE MANUAL
LEADING EDGE SLATS -GENERAL DESCRIPTION
EFFECTIVITY BEJ ALL 27-81-00
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LEADING EDGE SLATS -GENERAL DESCRIPTION -SLAT DRIVE SYSTEM
General
There are six outboard slats, one inboard slat, and one krueger flap on each wing. The slats are numbered 1 through 14, left outboard to right outboard.
These are the components of the slat drive system:
*
Slat PDU
*
Torque tubes
*
Torque tube supports
*
Angle gearboxes
*
Driveline offset gearboxes
*
No-back brake offset gearboxes
*
Krueger flap offset gearboxes
*
Rotary actuators
*
Slat main tracks.
Slat PDU
The slat PDU gets hydraulic power through the primary control valve and electric power through the slat extend/retract relays. Hydraulic and electric motors on the PDU move the slat drive system. The slat PDU also contains the slat limit switch. The switch removes electrical power from the electric motor when the slats move to their limit during operation in the alternate mode.
Torque Tubes
The torque tubes transmit power from the PDU to the slat actuation assemblies.
Torque Tube Supports
The torque tube supports hold the torque tubes in place.
Angle Gearboxes
The angle gearboxes connect torque tubes that are at different angles to each other.
Offset Gearboxes
The driveline offset gearboxes connect torque tubes that are offset from each other.
The no-back brake offset gearboxes transfer power from the torque tubes to the slat rotary actuators. These gearboxes also help prevent airloads from retracting the slats.
The krueger flap offset gearboxes transfer power from the torque tubes to the krueger flap rotary actuators.
Rotary Actuators
The slat rotary actuators move the slat main tracks. The krueger flap rotary actuators move the krueger flap.
Slat Main Tracks
As the slat rotary actuators turn, the slat main tracks move the slats.
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LEADING EDGE SLATS -GENERAL DESCRIPTION -SLAT DRIVE SYSTEM
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LEADING EDGE SLATS -COMPONENT LOCATIONS
General
The slat components are in these areas:
*
The main landing gear wheel wells
*
The forward cargo compartment
*
The wings.
Main Landing Gear Wheel Well Components
The slat primary control valve is on the keel beam in the left main landing gear wheel well. The autoslat priority valve is on the ceiling in the right main landing gear wheel well.
Forward Cargo Compartment Components
The floor angle gearboxes and some of the torque tubes are above and to the sides of the aft section of the forward cargo compartment. Remove the cargo lining in the aft section of the forward cargo compartment to get access.
Wing Components
The slat PDU and one of the strakelet angle gearboxes are in the left wing root. The other strakelet angle gearbox is in the right wing root. Remove the access panels under the wings to get access to these components.
In the fixed leading edge of the wings are the following components:
* No-back brake offset gearboxes
*
Rotary actuators
*
Slat main tracks
*
Some of the torque tube supports
*
Driveline offset gearboxes.
Remove the access panels under the wings to get access to these components.
The inboard slats, krueger flaps, and outboard slats are on the leading edge of the wings. The krueger flap is between the inboard slat and the engine strut.
EFFECTIVITY BEJ ALL 27-81-00
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D633W101-BEJ Sep 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
LEADING EDGE SLATS -COMPONENT LOCATIONS
EFFECTIVITY BEJ ALL 27-81-00
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D633W101-BEJ Jan 05/2002
LEADING EDGE SLATS -SLAT PRIMARY CONTROL VALVE
Purpose
The slat primary control valve controls hydraulic power to the hydraulic motor. In the primary mode, this valve controls the direction and speed of movement of the slat drive system. In the secondary and alternate modes, this valve prevents hydraulic power to the hydraulic motor. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 飞行操纵 Flight Controls 2(61)
