(a)
Remove the access door to the fuel tank
(b)
Disconnect the pipes and brackets from the rib
(c)
Remove the bolts from the rib and move the rib one side to get clearance.
(2)
The installation is the opposite of these steps.
B. Remove the inspar ribs at WS 1056, 1084, 1168, and 1196 to get access to the area behind the rib. Disconnect all of the rib and these components:
(1)
The upper chords
(2)
The lower chords
(3)
The web
(4)
The stiffeners from the spars
(5)
The stringers.
TASK 57-12-01-004-001
2. Rib Removal (Fig. 401)___________
A. Standard Tools and Equipment
(1) Sack - small cloth (used as a container for removed fasteners from the rib, many are necessary)
B. Consumable Materials
(1) G00298 Tape - Masking
C. References
(1)
28-11-02/401, Reserve and Main Tank Access Doors
(2)
28-41-01/401, Tank Unit
(3)
SRM 51-50-01, Support of Fuselage in Jigged Position
(4)
IPC 57-12-13 Fig. 1 (WS 1084)
(5)
IPC 57-12-18 Fig. 1 (WS 1168)
D. 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
552GB Access Door - Fuel Tank
553AB Access Door - Fuel Tank
652DB Access Door - Fuel Tank
652EB Access Door - Fuel Tank
652GB Access Door - Fuel Tank
653AB Access Door - Fuel Tank
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
57-12-01
ALL ú ú 03 Page 401 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
WS 1056 RIB
Inspar Removable Rib Installation
Figure 401 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
57-12-01
ALL ú ú 01 Page 402 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
A
THE SPACER IS BONDED TO THE STRINGER
THE BOLTS THAT ATTACH THE STRINGER TO THE CHORD
INBD FWD
CLAMP BOLTS
A
THE RADIUS FILLER IS BONDED TO THE CHORD
A
FRONTBOLT, WASHER, FILLER, SPAR
SPACER AND NUT BOLTS AND WASHERSBOLTS AND WASHERS (10 LOCATIONS ON THE TOP CHORD) (13 LOCATIONS ON THE(24 LOCATIONS AT THE EXTENDED STIFFENERS)
ENDS OF THE RIB) VENT TUBE
CLAMP
1
FRONT SPAR BOLT, WASHER, FILLER,
SPACER AND NUT TUBING FWD
(6 LOCATIONS ON CLAMPS
1 THE BOLT AT THIS LOCATION THE BOTTOM CHORD) IS LONGER THAN OTHER BOTTOM
A-A
CHORD BOLTS
Inspar Removable Rib Installation
Figure 401 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
57-12-01
ALL ú ú 01 Page 403 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
B
BOLTS, WASHERS, NUTS (9 LOCATIONS)
REAR SPAR
WING STRINGERS
UPPER RIB CHORD
BOLTS, WASHERS, NUTS
(5 LOCATIONS)
B
LOWER RIB
CHORD
INSPECTION HOLE
(3 LOCATIONS)
MIDSPAR
INBD FWD
WS 1168
B
BOLT, WASHER, FILLER, ACCESS PANELSPACER, AND NUT (REMOVE FROM(9 LOCATIONS ON THE TOP CHORD) MIDSPAR THE OUTBOARD SIDE)
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