57-40-00
 ALL  ú ú 04 Page 1 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 WING ATTACH/SPLICE FITTINGS - DESCRIPTION AND OPERATION
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General (Fig. 1)
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 A.  The wing splice fittings are fabricated from aluminum alloy and serve to join the outboard wing main frame to the center wing frame thus forming an integral, continuous wing box section. The primary splice fittings attach the respective front and rear spars of the outboard wing to those in the wing center section at the wing-to-body ribs. Splice fittings join the mid spars of the outboard and wing center section at the wing-to-body ribs. Additional splice fittings join the stringers of wing center section to the outboard wing.
Front Spar Splice Fittings
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 A.  The front spar splice fittings are vertically mounted, modified tee section fittings machined from forged aluminum alloy material. The fittings join the outboard front spar chords and webs with the wing center section front spar chords and webs and to the left and right wing-to-body ribs at WBL 127.75 to provide a continuous load path design. Machined pads or bosses provide additional strength at fastener hole locations and facilitate fit of mating structure. The fittings are shot peened after machining to reduce the possibility of stress corrosion. The front spar fittings form a part of the wing-to-fuselage attachment at the body station 1000 bulkhead.
Rear Spar Splice Fittings
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 A.  The rear spar splice fittings have similar structural applications as the front spar fittings in that they are flanged type, vertically mounted members joining the rear spar chords and webs of the outboard wing and center sections to the wing-to-body ribs. Machined from aluminum alloy forgings, the fittings are of a modified tee section, and of a different configuration than the front spar fittings. The fittings are shot peened and form a portion of the wing-to-fuselage bulkhead attachment at body station 1241.0.
Mid Spar Splice Fittings
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 A.  The outboard wing mid spar chords and webs are joined to like parts of the wing center section at the wing-to-body ribs, WBL 127.75. The fittings, fabricated from 7075 aluminum alloy, are tee shaped extrusions installed in the vertical position. The splice fittings are an integral part of the mid spar-fuselage bulkhead, station 1140, attachment.
Stringer Splice Fittings
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 A.  Upper and lower stringers in the wing center section is spliced through the wing-to-body rib to stringers in the outboard wing at WBL 127.75. Splicing is accomplished with fittings from machined forgings or extrusions. All fittings are of aluminum alloy.
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 57-41-00
 ALL  ú ú 01 Page 1 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
STA
STA
12411140 BODY BULKHEAD
REAR SPAR
REAR SPAR SPLICE FITTING

FRONT SPAR SPLICE FITTING
FWD

INBD
REAR SPAR SPLICE FITTING

Wing Attach/Splice Fittings
Figure 1

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 57-41-00
 ALL  ú ú 01 Page 2 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 FLIGHT CONTROL ATTACH FITTINGS - DESCRIPTION AND OPERATION
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General
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 A.  Attach fittings are provided to anchor flight control surfaces to the wing structure. Fittings attach the aileron to special hinge ribs, the trailing edge flaps to the lower wing skin and associated structure, the Krueger and variable camber flaps to leading edge ribs, the inboard spoilers to the trailing edge support beam, and the outboard spoilers to the wing rear spar.
Aileron Attach Fittings (Fig. 1)
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 A.  The inboard ailerons are primarily supported by two wing trailing edge hinge ribs at WBL 461.5 and 505.0. Hinge support clevis fittings attach to the ribs and mate with aileron hinge fittings. The support fittings are fabricated from aluminum alloy forged material. Two fail-safe hinge fittings, installed on trailing edge ribs at WBL 446.16 and 514.63, also attach to aileron hinge fittings to provide additional support. Actuation mechanism and reaction linkages attach to wing rear spar fittings and to aileron front spar fittings.
　
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