(2)
Remove the warning notice(s).
(3)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
LEADING EDGE - DESCRIPTION AND OPERATION
________________________________________
1. General
_______ The fixed leading edge is forward of the front spar of the wing box, between the wing root and the wing tip. It is a structure of ribs and riblets connected by sub-spars. The D-nose riblets, installed on the forward sub-spar add strength to the structure. They hold the top and forward skin panels. Stringers connect the ribs and add strength to the top skin.
The fixed leading edge has attachments for the slat drive mechanisms (Ref. 27-80-00).
The space inside the leading edge is used to hold these systems:
-
the environment protection system (Ref. 36-14-00)
-
the wing ice protection system (Ref. 30-11-00)
-
the engine bleed air supply system (Ref. 36-11-00)
-electrical, hydraulic and pneumatic installations.
2. Description
___________
(Ref. Fig. 001, 002)
The structure of the fixed leading edge has:
-sub-spars
-ribs and riblets
-skins
-access panels.
3. Component Description
_____________________
R A. Sub-spars and Ribs
The sub-spars connect the ribs and add strength to the structure. They are made from aluminum alloy plate. The D-nose riblets are installed on the forward sub-spar.
The ribs are machined from aluminum alloy and are installed on the front spar as follows:
-track ribs, in pairs, installed at the slat track positions. Each pair of track ribs holds four pairs of rollers to guide the slat tracks.
-
two pylon ribs, one each side of the engine pylon. These ribs hold the pylon shroud panels and are sealed with interfay sealant.
-
two ribs adjacent to the wing root. The inboard rib is made of sheet metal and the outboard rib is machined.
-
two ribs adjacent to the wingtip to which nose skins are attached.
-intermediate ribs, which add strength to the structure.
Leading Edge
Figure 001
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Leading Edge
Figure 002
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B. Skins
The top and bottom wing skin panels come forward of the front spar to make part of the leading edge. The top and forward surface of the leading edge structure has nose skins which are held by D-nose riblets. The bottom surface is an open structure which gives access to the slat tracks and drive mechanisms. It is closed with access panels.
C. Access Panels
(1) Top surface
There are three access panels in the top and forward surface of the
leading edge. These are:
-the upper pylon panel 521BT (621BT) adjacent to ribs RIB7 and RIB8. This is a large panel which gives access to the pylon link, the hot air duct, the firewire connector and the cable looms
- outboard of the engine pylon, a small panel 522AT (622AT) which gives access to the fuel low pressure valve and actuator
-between ribs RIB12 and RIB13, a small access panel 522BT (622BT) which gives access to the slat anti-icing hot air duct.
(2) Bottom surface
The bottom surface of the leading edge is closed by access panels:
-Panel 1, adjacent to the wing root. This panel is made from bonded layers of carbon fibre and gives access to the slat track 1.
-Panels 2 and 3, which are made from bonded carbon fibre, with a honeycomb core. These panels include a small inspection hole with a cover, to give access to the torque-limiter indicator attached to each slat actuator (Ref. 27-84-00). The panels also give 'blow-off' protection to the leading edge.
-two small aluminum alloy panels adjacent to the engine pylon which give access to the pylon link attachments.
-Panels 4 and 5, similar to Panels 2 and 3. (Panel 4 has an inspection hole which gives rapid access to the wing anti-ice valve.)
-the telescopic duct panel
-Panel 6, which gives access to the slat track 7.
-
the refuel-defuel panel, which gives access to the pressure refuelling coupling.
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