57-21-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
ROTARY 
ACTUATOR 
(2 PLACES) 
DRIVE 
SHAFT 
FOLDING 
NOSE 

A
747-400 MAINTENANCE MANUAL
 WING TRAILING EDGE - DESCRIPTION AND OPERATION
______________________________________________
 1.  General (Fig. 1)_______
 A.  The wing trailing edge structure is cantilevered from the wing rear spar and comprises stiffened ribs, spanwise beams and intercostals, auxiliary spars, braces, and skin panels. Additional support of the inboard portion is provided by the landing gear support beam. The structure is generally divided into two sections: fixed structure and movable structure. Flight control surfaces are movable structure and consist of two ailerons, two flaps, and six spoiler segments on each wing. These surfaces form a large portion of the trailing edge structure and are supported by hinge support ribs, beams, and/or track ribs. The inboard portion of the trailing edge structure between the fuselage and WBL
 515.0 extends aft of the basic wing trailing edge.
 2.  Trailing Edge Structure_______________________
 A.  The trailing edge structure consists of the cantilevered portion aft of the wing rear spar. This structure supports the flight control surfaces, operating mechanisms, and other airplane systems equipment, tubing, cables, and wiring. Wells and/or operating clearance areas for the spoilers, aileron, flaps, and wing main landing gear are provided in the ribs, beams, and other supporting members.
 B.  The inboard portion, between WBL 128.46 and 445.94, is constructed of chordwise and spanwise ribs, a trailing edge beam, auxiliary spars, intercostals, strut-type braces, and skin panels. Flap track ribs at WBL
 235.20 and 353.00 support the inboard flap. These ribs are mounted beneath the trailing edge proper and are supported by the wing rear spar, inspar ribs, and the landing gear support beam. The trailing edge support beam, which is located immediately forward of the leading edge of the spoilers between WBL 235.20 and 445.94, provides hinge support and actuator attachments for the inboard spoilers. Upper and lower auxiliary spars are attached to either side of the landing gear support beam. These spars provide support for the trailing edge skin panels and internal structure without transferring landing gear loads into the auxiliary spars and panels. Truss-type braces attached to the aft side of the auxiliary spar and the trailing edge support beam reinforce the lower skin panels. The skin panels are primarily of fiberglass honeycomb materials (Ref 57-30-00 D&O).
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 57-22-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

FRONT SPAR
TRAILING EDGE BEAM
INBOARD AILERON
WS 876.53
OUTBOARD
SEE A
FLIGHT SPOILERS

AIRPLANE
WS
1155.53
TRAILING EDGE
GROUND SPOILER
INBOARD FLIGHT SPOILER
WBL INBOARD FLAP
445.94
OUTBOARD FLAP
REAR SPAR
OUTBOARD GROUND SPOILER
AILERON HINGES
TRAILING EDGE
BEAM

LANDING GEARINBOARD FLIGHT SUPPORT BEAMSPOILER HINGES REAR SPAR
TRAILING EDGE RIBS
OUTBD FWD
A
WBL 432.6
Wing Trailing Edge Structure Figure 1
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 57-22-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 C.  Outboard of WBL 445.94, the trailing edge ribs are either located on buttock lines or are normal to the wing rear spar. Two primary hinge support ribs at WBL 461.5 and 505.0, and two fail-safe hinge support ribs at WBL 446.16 and 514.63 support and provide a hinge line for the inboard aileron. The outboard flap is attached to the wing by means of flap track ribs at WBL 584.98 and 743.83. These ribs, external to the trailing edge, are attached to the wing rear spar and to wing inspar ribs. Fittings attached to the wing rear spar at 16 places between wing stations 876.53 and 1155.53 serve as hinge supports for the four outboard flight spoilers. The outboard aileron is supported by five hinge fittings attached to the wing rear spar between wing stations 1252.00 and 1548.20. A series of truss-type members cantilevered aft of the rear spar reinforce the lower skin panels. The trailing edge panels are primarily of fiberglass honeycomb construction (Ref 57-30-00 D&O).
　
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