OUTBOARD ENGINE AND NACELLE
BBL BBL 0 0 WBL
OUTBD INBD
WBL 0
A
Wing
Figure 1
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A
747-400
MAINTENANCE MANUAL
E. The wing is attached to the fuselage in such a manner that the wing spars form an integral part of bulkheads at body stations 1000.0, 1140.0, and 1241.0. Another wing-to-fuselage attachment is by the flanged upper rib chords at right and left BBL 127.75. Other points of attachment are the main landing gear support beams, the keel beam, and the longitudinal floor beams above the center wing.
F. The auxiliary structure of the wing includes the wing leading edge, trailing edge, wing tip, winglet, and flight control surfaces. The leading edge structure is cantilevered forward of the wing front spar. The trailing edge structure and control surfaces are cantilevered aft of the wing rear spar and supported additionally at the inboard end of the wing by the landing gear support beam. The landing gear support beam is attached at the inboard end to the fuselage frame at the center of the main wheel well and at the outboard end to the rear face of the wing rear spar. The winglet is cantilevered outboard from the wing closure rib at WBL 1247.
G. Fourteen control surfaces (Fig. 2) are supported by the leading edge structure of each wing; three Krueger flaps are hinged from the inboard one-third of the wing span, and along the outboard two-thirds, eleven variable camber flaps are installed. The control surfaces along the trailing edge of each wing consist of inboard and outboard flaps, an inboard and outboard aileron, and a total of six spoilers.
H. Access doors and openings are provided in the lower wing skin to permit entry to the interior of the wing boxes. Access to the interior of the center wing box dry bay area is provided in the center wing front spar web. Refer to AMM 57-31-00/001 for description and location of wing access doors and openings.
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A 747-400 MAINTENANCE MANUAL
INBOARD FLAP
VARIABLE CAMBER FLAP
AND OUTBOARD AILERON
B-B
Wing Flight Control Surface
Figure 2
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747-400 MAINTENANCE MANUAL
MAIN FRAME - DESCRIPTION AND OPERATION
______________________________________
1. General_______
A. The main frame, a box beam, consists of the left and right wing boxes and the center wing box permanently joined together. Each section is formed by upper and lower skin panels and front and rear spars. The wingtip closure rib and a chordwise rib at BBL 127.75 define the ends of the left and right boxes. The ends of the center section are defined by the BBL
127.75 ribs. Flanged chords and fittings are used to join the left and right boxes to the center box.
2. Left and Right Box Beams (Fig. 1)________________________
A. The areas of the left and right box beams between the wing-to-body rib at BBL 127.75 outboard to wing station 1485 are sealed to provide a fluid-tight compartment for storage of fuel. This area is divided into three separate fuel tanks by tank end ribs at WBL 470 and WBL 834. The area outboard of wing station 1485 contains a vent surge tank.
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