2
THE BOLT AT THIS LOCATION IS LONGER
THAN OTHER TOP CHORD BOLTS
Inspar Removable Rib Installation
Figure 401 (Sheet 3)
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A
747-400
MAINTENANCE MANUAL
WING
STRINGERS
REAR
SPAR
C
BOLTS, WASHERS, NUTS (5 LOCATIONS)
UPPER RIB
CHORD
C
LOWER RIB
CHORD
BOLTS, WASHERS, NUTS
(3 LOCATIONS)
MIDSPAR
FRONT SPAR
INBD FWD
INSPECTION HOLE
WS 1084 (3 LOCATIONS) C
BOLT, WASHER, FILLER, SPACER, AND NUT (5 LOCATIONS
MIDSPAR BOLT AND WASHER
ON THE TOP CHORD) (8 LOCATIONS ON THE EXTENDED STIFFENER)
BOLT AND WASHER
(23 LOCATIONS AT
THE ENDS OF THE RIB)
11
FWD BOLT, WASHER, FILLER, SPACER, AND NUT
1
THE BOLT AT THIS LOCATION IS LONGER C-C (3 LOCATIONS ON THE BOTTOM CHORD)
THAN OTHER BOTTOM CHORD BOLTS
Inspar Removable Rib Installation
Figure 401 (Sheet 4)
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747-400 MAINTENANCE MANUAL
BOLTS, WASHERS, NUTS (10 LOCATIONS)
D STRINGERS WING
REAR SPAR UPPER RIB CHORD
INSPECTION HOLE (3 LOCATIONS) D MID SPAR
INBD FWD LOWER RIB CHORD
WS 1056 D BOLTS, WASHERS, NUTS (6 LOCATIONS)
BOLTS AND WASHERS (23 LOCATIONS AT THE ENDS OF THE RIB) BOLT, WASHER, FILLER, SPACER, AND NUT (10 LOCATIONS ON THE TOP CHORD)
REAR SPAR STIFFENER) BOLT, WASHER, AND NUT (3 LOCATIONS ON THE EXTENDED 1 MIDSPAR
BOLT, WASHER, FILLER, SPACER, AND NUT (6 LOCATIONS ON THE BOTTOM CHORD) 1 SCREW, WASHERS, AND NUT
1 THAN OTHER BOTTOM CHORD BOLTS. THE BOLT AT THIS LOCATION IS LONGER D-D FWD
Inspar Removable Rib Installation Figure 401 (Sheet 5)
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747-400 MAINTENANCE MANUAL
E. Procedure
S 014-002
CAUTION: BEFORE THE RIB REMOVAL, MAKE SURE YOU HAVE PADS AND MATS IN THE
_______ WORK AREA. WHEN YOU REMOVE THE RIBS, DO NOT LET THEM TOUCH THE TUBING, HOSE OR WING STRUCTURE BECAUSE IT WILL DAMAGE THE FUEL TANK SEALANT OR THE RIB SURFACE.
(1)
Remove the access door to the fuel tank to get access to the rib (Ref 28-11-02/401).
S 034-003
(2)
Disconnect the plumbing brackets from the bottom side of the rib chords.
S 034-004
(3)
If you are at WS 1056 or 1168, remove the fuel quantity indicating system tank units (Ref 28-41-01/401).
S 034-016
(4)
Disconnect the tubing clamp from the rib web at WS 1056 and 1168.
S 034-005
(5)
If you are at WS 1196, disconnect the tubing clamp at the top of the rib.
S 034-006
(6)
Loosen all the bolts that attach the rib to the wing structure.
NOTE: If you find a hole that is not in line with the bolt during
____ the bolt removal, it is recommended that you put the wing in the jig position (SRM 51-50-01).
S 034-007
CAUTION:_______IDENTIFY THE UPPER AND THE LOWER CHORD PARTS. IF YOU DO NOT INSTALL THE COMPONENTS IN THEIR INITIAL LOCATIONS, IT CAN CAUSE DAMAGE TO THE EQUIPMENT.
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