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747-400 MAINTENANCE MANUAL
2) The pylon panels 3) The pylon doors 4) The strut skins (cut outs around edges; inner and outer
surfaces). 5) The nacelle cowlings.Open the trailing edge fairing door and remove the strut access panels (AMM 06-09-09/201).Remove the gap cover above the upper link.Remove the trailing edge fixed fairing (inboard struts).Examine the internal strut areas that follow:
NOTE:____ Examine the bulkhead area of the AFT engine mount
carefully.
NOTE:____ Examine the strut midspar carefully.
1) Bulkhead chords.
2) Bulkhead skins.
Examine the areas of the struts that follow, for damage:
1) Midspar attachment area:
-Strut midspar fitting
-
Spring beam mid-pivot area
-
Spring beams
-Under wing fittings
-Fuse pins (inspection required on Strut #3 only)
-Lugs
-Side links (inspection required on Strut #1 and Strut #3 only)
-Attachment hardware
-All other structure in this area. 2) Diagonal brace area:
-Diagonal brace assembly
-Strut attach fitting
-Wing attach fitting
-Lugs
-Bushings
-Fuse pins (upper pin only)
-All other structure in this area
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747-400 MAINTENANCE MANUAL
3) Upper link area:
-Upper link assembly
-Strut attach fitting
-Wing attach fitting, including upper skin attachments
-Bushings
-Lugs
-Fuse pins/bolt
-Wing leading edge beam located above each engine strut.
-Strut to wing fairing
-All other structure in this area. 4) Examine all engine mounts and adjacent structure. 5) If you think there is possible engine damage or seizure,
remove the engine, if it is necessary (AMM 71-00-02/401).Examine the leading edge fairings that follow.
NOTE: The general section has a list of components and
____ areas to examine. Careful inspection of the specified components and areas identified in this section is required.
1) The wing-to-body fairing at the wing leading edge. 2) The fairing at the engine strut-to-wing attachment
(underwing fairing).Examine the fuselage skin from body station (BS) 1480 to 1961, below stringer 23.
NOTE: Follow the general section list of components and
____ areas to examine. Careful, inspection of the specified components and areas identified in this section is required.
1) Creases or cracks in the skin.
2) Skin wrinkling that crosses a line of fasteners.
3) Pulled, missing, or distrubed/loose fasteners.
Examine the keel beam structure looking for:
NOTE: Follow the general section list of components and
____ areas to examine. Careful, inspection of the specified components and areas identified in this section is required.
1) Web buckles that spanning continuously between two web segments and passing across the common web stiffener.
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2) Creases in the web.
3) Buckling or local crippling of a stiffener or chord.
NOTE: Buckling can be determined if any creases or
____ sharp bends can be found in either the stiffener flanges or the web of the stiffener.
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