57-12-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 024-008
(8) Move the rib to the opposite side of the bay so you can get to the area behind the rib.
TASK 57-12-01-404-009
3. Rib Installation (Fig. 401)________________
A. References
(1)
28-41-01/401, Tank Unit
(2)
28-11-02/401, Reserve and Main Tank AccessDoors
(3)
IPC 57-12-13 Fig. 1 (WS 1084)
(4)
IPC 57-12-18 Fig. 1 (WS 1168)
B. Access
(1)
Location Zone 553 Reserve Tank Front Spar to Rear Spar, Left 653 Reserve Tank Front Spar to Rear Spar, Right
(2)
Access Panel
552DB Access Door - Fuel Tank
552EB Access Door - Fuel Tank
552FB Access Door - Fuel Tank
553AB Access Door - Fuel Tank
652DB Access Door - Fuel Tank
652EB Access Door - Fuel Tank
652FB Access Door - Fuel Tank
653AB Access Door - Fuel Tank
C. Procedure
S 424-010
(1)
Put the rib against the wing structure.
S 434-011
(2)
First install the lower chord bolts and then the upper chord bolts last.
NOTE:____First install all the bolts loosely. Install the bolt with the head and the washer against the stringer. Install the nut and the washer against the radius filler of the rib chord. Make sure all the bolts, the micarta spacers, the radius fillers, the washers, and the nuts are in their initial locations.
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57-12-01
ALL ú ú 01 Page 408 ú Oct 10/91
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A 747-400 MAINTENANCE MANUAL
(3) S 434-015Tighten the bolts.
(4) S 434-012Connect all the plumbing brackets that were disconnected.
(5) S 434-013If you are at WS 1056 or 1168, install the fuel quantity indicating system tank units (Ref 28-41-01/401).
(6) S 414-014Install the access door for the fuel tank (Ref 28-11-02/401).
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57-12-01
ALL ú ú 01 Page 409 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
WING STRINGERS - DESCRIPTION AND OPERATION
__________________________________________
1. General_______
A. The upper and lower center and outboard wing skin panels are reinforced internally by a series of Z, T, J, channel, and hat section stringers. Thirty-three stringers are attached to the upper skin inner surface, twenty-three are attached to the lower skin inner surface. Since there are no production breaks in the outboard wing structure, the stringers extend continuously from the wing-to-body rib to the wing tip, as far as the tapering wing planform allows.
2. Wing Stringers (Fig. 1)______________
A. The upper and lower center and outboard wing stringers are identified by their position relative to the rear spar and are numbered in sequence beginning with the first stringer forward of the rear spar. The center wing upper stringers S8C, S14C, S20C, and S28C, and lower stringers S6C, S10C, S14C, and S19C serve as chords for the No. 1 spanwise beam, mid spar, and No. 2 and 3 spanwise beams respectively. Upper stringers S6C, S7C, S10C, and S11C are utilized in the wing tank vent system. Spanwise skin splices are accomplished at upper stringers S14C and S27C, and at lower stringers S5C, S10C, S15C, and S20C, Correspondingly numbered outboard wing and center wing stringers have common junctions at WBL 127.75, providing continuous load paths across the wing-to-body rib. The outboard wing upper stringers S6 through S13 are utilized as a portion of the fuel tank vent system. The skin flange of upper stringers S14 and S27 and lower stringers S5, S10, S15, and S20 serves as a skin joint splice. Lower stringer S7 outboard is nonexistent where access doors are found in lower panel No. 2.
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