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A
747-400 MAINTENANCE MANUAL
WING LEADING EDGE COVER
TORQUE BOX
SEE A
OUTBOARD STRUT
TORQUE BOX 241 STA NAC 251 STA NAC A B A B STRUCTURE SUPPORT SPRING BEAM
FRAME SECTION
A
____NOTE: Figure 601 (Sheet 1) SHOWN, RIGHT SIDE SIMILAR. LEFT SIDE STRUCTURAL MEMBERS Spring Beam Support Structure Inspection
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TRAILING EDGE
FAIRING DOORS
A
747-400
MAINTENANCE MANUAL
SKIN STRUT BEAM SPRING BEAM SPRING
(LEFT SIDE) SECTION UPPER FRAME
(RIGHT SIDE) SECTION UPPER FRAME
FRAME SECTION A-A BULKHEAD
PIVOT BEARING SPRING BEAM PIVOT BEARING SPRING BEAM
(RIGHT SIDE) SUPPORT STRUCTURE SPRING BEAM
(LEFT SIDE) SUPPORT STRUCTURE SPRING BEAM
SKIN STRUT
BULKHEAD
____NOTE: INSPECTED. ALL SHADED AREAS SHOULD BE SUPPORT STRUCTURE SPRING BEAM B-B
Figure 601 (Sheet 2) Spring Beam Support Structure Inspection
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747-400 MAINTENANCE MANUAL
D. Procedure
S 496-012
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE LE FLAP SAFETY LOCK. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Retract leading edge flaps and install leading edge flap drive unit lock (Ref 27-81-00/201).
S 016-003
(2)
Open the trailing edge (TE) fairing doors (Ref 54-62-00/201).
S 016-004
(3)
Remove the cover of the wing leading edge.
S 146-005
(4)
Clean the area for the inspection.
S 296-006
(5)
Do a borescope inspection on the structural parts above the closure spar web as follows:
(a)
Inspect the parts for cracks which have started from the fastener locations and tooling holes (access is through the cover of the wing leading edge, except as noted).
(b)
The top section of the bulkhead of the spring beam support (NAC STA 251) (Fig. 601, Section A-A).
NOTE: Access to the bulkhead is from the aft through the
____ TE fairing doors on the right side of strut no. 1 and the left side of strut no. 4.
(c) The top section of the frame which is forward of the bulkhead of the spring beam pivot (NAC STA 241) (Fig. 601, Section B-B).
S 296-007
(6)
Tell Boeing Customer Support Engineering if cracks are found.
(7)
Close the TE fairing doors (Ref 54-62-00/201).
S 416-009
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