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57-22-01
ALL ú ú 02 Page 404 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 424-061
(6) Attach the panel to the airplane:
(a)
Install the fasteners that attach the panel leading edge to the rib aft of the wing landing gear beam.
(b)
Install the fasteners that attach the panel to the rib at approximately BL 255, BL 235 and the support beam.
(c)
Install the fasteners that attach the panel to rib and the wing-to-body fillet fairing adjacent to the body.
(d)
Install the fasteners in the area of the titanium doublers as shown in Figure 403. 1) Apply BMS 5-95 sealant on the shank of the fasteners. 2) Install the fasteners. 3) Immediately tighten the fasteners to squeeze out the BMS
5-95 sealant. 4) Remove the excess BMS 5-95 sealant. 5) Retighten the fasteners after a twenty minute sealant
drying period.
S 764-065
(7) Do a check of the resistance between the fasteners and adjacent structure.
NOTE: The maximum permitted resistance is 0.001 Ohm (SWPM
____
20-20-00).
S 624-063
(8) Prepare to seal the fasteners (as shown in Fig. 403) and paint the panel:
CAUTION: DO NOT WALK OR KNEEL DIRECTLY ON THE UPPER PANEL, THIS CAN
_______
CAUSE DELAMINATION.
(a) Put protective mats on the upper panel.
NOTE: Where it is possible do work from a stand.
____
WARNING: USE BREATHING FILTERS SO AS TO NOT INHALE SANDING DUST
_______
WHICH MAY CAUSE INJURY TO PERSONS.
(b) Remove all paint and primer from the upper panel in the area to be sealed.
CAUTION: DO NOT EXPOSE OR DAMAGE THE FIBERS OF THE FIBERGLASS.
_______
1) Use 150 grit, or finer, aluminum oxide sandpaper to remove the finish coat and primer in the area to be sealed.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
57-22-01
ALL ú ú 06 Page 405 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
2) Use 240 grit, or finer, aluminum oxide sandpaper to feather the edges of the finish coat and primer around the area to be sealed.
3) Apply BMS-5-95 Class F sprayable sealant over the fastener
heads on the panel. 4) Apply conductive coating (SOPM 20-10-06). 5) Apply primer (SOPM 20-10-06). 6) Apply top coat to match existing finish on airplane (SOPM
20-10-06).
S 424-064
(9)
Connect and adjust the No. 1 and 2 ribs, diagonal tie rods and tie link (AMM 57-22-01/501).
S 424-066
(10)
Connect the upper end of the vertical tie rod of the No. 2 rib near the top of the landing gear beam.
NOTE: If you have a problem with the installation of the pin, apply
____ upward pressure on the lower surface of the panel to overcome the weight of the panel and any pre-load caused by deflection of the landing gear beam.
S 634-068
(11) Apply fillet sealant BMS-5-95 around the torsion link ribs and bolt head on the lower surface.
E. Put the Airplane Back to its Usual Condition.
S 944-052
WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE TRAILING
_______ EDGE FLAPS BEFORE YOU MOVE THE LEVER. WITH THE HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRIC POWER WHEN YOU MOVE THE FLAP CONTROL LEVER. THIS CAN CAUSE INJURY TO PERSONS AND DAMGE TO EQUIPMENT.
WARNING: MAKE SURE ALL PERSON AND EQUIPMENT ARE CLEAR BEFORE YOU MOVE
_______ THE CONTROL LEVERS. THE SPOILERS CAN RETRACT QUICKLY AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
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