C
D
REAR SPAR
SHEAR
RIB (TYP) D
TANK END
SPANWISE
BEAM NO. 1 BULKHEAD
SEGMENT FRAME
SURGE TANK ENDS
WING EXTENSION JOIN RIB
WING TIP CLOSURE RIB
WING CENTER SECTION REAR SPAR
CHORDS
MID SPAR
STRAPS
(TYP) STIFFENER (TYP)
FRONT SPAR
WING-TO-BODY RIB
A
Wing Ribs Figure 1 (Sheet 1)
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747-400 MAINTENANCE MANUAL
MID SPARFRONT UPPER RIB CHORD SPAR
RIB WEBRIB STIFFENER
LOWER RIB CHORDSHEAR TIES (TYP)
STANDARD RIB - INBOARD OF WING STATION 1224 A-A
FRONT MID SPAR
SPAR
TYPICAL SHEAR TIE RIB B-B
FRONT MID
SPAR STIFFENER SPAR
WEB (TYPICAL)
SUPPORT RIB C-C FRONT
UPPER RIB REARSPAR WEB
CHORD SPAR
LOWER RIB CHORD
STANDARD RIB - OUTBOARD OF WING STATION 1224.0 D-D
Wing Ribs Figure 1 (Sheet 2)
REAR
SPAR
SPAR WEB
LOWER SPAR CORD
REAR
SPAR
STIFFENER (TYPICAL)
WEB
REAR
SPAR
STIFFENER (TYPICAL)
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747-400 MAINTENANCE MANUAL
(2) Outboard of wing station 1224, the structure of a typical rib consists of an upper angle chord, stiffened web, and lower angle chord. Along the upper and lower edges of the web, an angle chord attaches the rib to the wing stringers, and at the forward and aft ends, the rib web is attached the front and rear spars.
B. Direct access to some of the structure and equipment located inside the fuel tanks is not possible through the fuel tank access doors. To obtain access to this structure or equipment, personnel must enter the tank through the nearest fuel tank access door and go through rib access openings into the areas where no external access door is provided. Four of the inboard standard ribs have removable sections for access to the area behind the rib (See Inspar - Removable Ribs, below).
4. Special Ribs (Fig. 1)____________
A. There are three basic types of special ribs: shear tie ribs, tank end ribs, and a wingtip closure rib.
(1)
Shear-tie ribs are used to distribute specific loads to the wing frame. Shear tie ribs are joined to both the stringers and skin panels. Shear tie ribs include the nacelle ribs, outboard surge tank end rib, three flap track support ribs, and landing gear support ribs.
(2)
Tank end ribs are like standard ribs but have seal pans installed between the stringers and between rib chord and wing skins. These tank end ribs are sealed to provide an absolute fuel seal.
(3)
The wingtip closure rib extends between the wing leading edge and trailing edge and provides attach structure for the winglet.
5. Inspar - Removable Ribs (Fig. 1)_______________________
A. The ribs at wing stations 1056, 1084, 1168, and 1196 have a removable section that provides access to the area between the removable section and the adjacent rib. Access to the removable section is through a fuel tank access door in the lower surface of the wing.
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747-400 MAINTENANCE MANUAL
INSPAR REMOVABLE RIBS - REMOVAL/INSTALLATION
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