-inboard and outboard end ribs, two track ribs, and a hold-down rib, all machined from aluminum alloy
 -in four positions, a nose rib forward of the spar and an intermediate
 rib behind it, each made from C-section aluminum alloy sheet. A hold-down bracket and bolt are attached to the hold-down rib. When the slat retracts fully, the bolt touches a stop on the fixed leading edge of the wing.
 There are rubbing blocks attached to the inboard and outboard end ribs.

 The top skin is made from aluminum alloy sheet. It has a finger strip
 bonded to its inner face to add strength.
 Two reversible hoisting lugs are installed on the top skin.

 The bottom skin is made from an etched aluminum alloy sheet. There are
 two drain holes in the bottom skin, and forty-four exhaust holes for the
 anti-icing system. Two buffers are attached to the bottom skin. They
 touch the fixed leading edge of the wing when the slats retract.

 Two girders, made from pressed aluminum alloy sheet, add strength to the
 structure and attach the top and bottom skins to the spar. The top girder
 is corrugated to let air from the anti-icing system flow through to the
 bottom skin.

 Slat 4
 Figure 001
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 Slat 4
 Figure 002
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 There are seals attached to the rear face of the slat:
 -at the inboard end of the slat
 -around the tracks
 -near the forward joint of the top and bottom skins.
 Elbow pieces reinforce the seals at each corner.

 Weather-seal strips close the areas between Slat 3 (Ref. 57-44-00) and Slat 4, and between Slat 4 and Slat 5 (Ref. 57-46-00). The strips are installed in parallel channels attached to the rear face of the top skin of the slats.
 B. Trailing Edge Structure
 The slat 4 has a trailing edge structure which is attached to the main rivetted structure at the rear spar. It closes the aft edge of the slat and completes the aerodynamic profile.
 The trailing edge is a bonded structure of aluminum alloy panels with a honeycomb core.
 C. Slat Tracks
 The slat 4 is connected to slat-tracks 9 and 10. Each slat-track is made from a curved steel forging and has a rack attached by bolts to its bottom face. A pinion on the slat-track actuator turns to move the rack and thus extends or retracts the slat. Fixed stops at the ends of the slat-track limit the travel of the slat.
 The slat-tracks are connected to the track ribs of slat 4 with bolts, nuts and titanium alloy links. A closing plate and self-aligning bearings are attached to the forward end of each slat-track. Eccentric bushes are installed in the slat-track ribs for adjustment of the slat.
 D. Attachments for the Wing Anti-icing System
 A piccolo tube goes through the slat ribs from the inboard end to the outboard end. It is connected to the outboard end of Slat 3, and the inboard end of Slat 5, by flexible hoses. The slat top girder is corrugated to let air from the piccolo tube flow through the exhaust holes in the bottom skin.

 SLAT 4 - INSPECTION/CHECK
_________________________
 TASK 57-45-00-200-001
 Special Detailed Inspection of Slat 4, Tracks 9 and 10: Visible Part of Roller Contact Area
 WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
_______
 START A TASK ON OR NEAR:

 -
THE FLIGHT CONTROLS

 -
THE FLIGHT CONTROL SURFACES

 -
THE LANDING GEAR AND THE RELATED DOORS

 -COMPONENTS THAT MOVE.
 WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______
 GEAR.

 1. Reason for the Job
__________________
 Refer to the MPD TASK: 574501-02
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s)
 No specific safety barriers
 No specific warning notices
 No specific access platform 3.5 m (11 ft. 6 in.)

 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
　
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