57-30-00
 ALL  ú ú 01 Page 3 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

VARIABLE CAMBER FLAP AND OUTBOARD AILERON
C-C

Wing Secondary Skin
Figure 2

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 57-30-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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A
747-400 MAINTENANCE MANUAL
 ACCESS DOORS (OPENINGS) - DESCRIPTION AND OPERATION
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General (Fig. 1)
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 A.  Access doors and panels are provided in the wing interior and exterior structure to facilitate inspection, maintenance, and repair of airplane systems equipment components, wing internal structure, and integral fuel tank areas (Ref AMM 12-21-04/301 for numerical listings and locations of external doors and openings).
Fuel Tank Access Doors (Fig. 1)
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 A.  Access to the main wing fuel tanks, reserve fuel tanks, and the vent surge tank is accomplished through removable sealed nonstructural access doors located in the wing lower inspar skin (Ref 28-11-00).
 B.  The wing center section fuel tank access doors are located in the lower
 outboard corners of the center section front spar (Ref 28-11-00).Internal Access Openings (Fig. 2)
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 A.  Access to the wing inspar areas without a fuel tank access door is possible through openings provided in the web of the mid spar and many of the webs of the ribs. Movement to certain areas is restricted by fuel baffle doors and inspar removable ribs which must be removed to gain entrance to areas beyond. There are openings in the web of the mid spar of each wing which permit movement into all the bays between the mid spar and the front spar. Except in the wing extension, there are openings in the web of the ribs permitting movement between ribs and partial depth rib openings permitting maintenance and inspection of the confined areas created by the diagonal ribs. Reinforcement of the structure surrounding each opening provides load carrying capabilities around the cutouts. At WS 1056, 1084, 1168, and 1196, the inspar removable ribs must be removed to gain entrance to the area behind (Ref 57-12-00). At WS 499.0, WS 724.5, WS 779.5 and WS 807.9, fuel baffle doors must be removed to permit further movement (Ref 2 -11-00).
External Access Doors and Panels (Fig. 2)
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 A.  Hinged access doors are installed in the lower side of the wing leading edge just outboard of the inboard nacelle to permit access to the fueling receptacles. On the left wing immediately outboard of the fuel station door is a hinged door for access to the fueling station control panel (Ref 28-11-00).
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 57-31-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

ACCESS OPENING TO DRY BAY (2 PLACES) SEE FIGURE 2 FOR FRONTACCESS TO THIS SPAROPENINGDRY BAY
INBOARD NACELLE  WS 499  SPANWISE BEAM NO. 3 
TANK END 
WS 807.9  WS 724.5 
FRONT SPAR  WS 779.5  REAR SPAR 
MID SPAR  WBL 353 FLAP TRACK RIB 

WS
NACELLE

OUTBD 1056
WS 1084
WS
1168

WS
1196

TANK END
MID SPAR
WBL 584.9 FLAP TRACK RIB 
WBL 743.8 FLAP TRACK RIB 
FUEL TANK ACCESS DOOR FREE MOVEMENT THROUGH OPENING MOVEMENT RESTRICTED, RIB OR FUEL BAFFLE DOOR MUST BE REMOVED 

Internal Access Openings
Figure 1

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 57-31-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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