BOTTOM VIEW OF LEFT WING
External Access Doors and Panels
Figure 2 (Sheet 1)
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747-400
MAINTENANCE MANUAL
BS920
ACCESS TO WING CENTER SECTION FRONT SPAR
External Access Doors and Panels
Figure 2 (Sheet 2)
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747-400
MAINTENANCE MANUAL
B. Additional access to the leading and trailing edge area is obtained by extending the flaps and raising the spoilers.
C. The wing-to-fuselage fillet fairing is removed per 53-51-01 to gain access to the wing center section front spar access openings.
D. Wing leading edge lower skin access (blowout) panels are located on the lower surface of the wing near each nacelle strut side fairing. The eight triangular shaped panels, when removed, permit access to the wing leading edge and nacelle strut areas. A panel within each access panel is designed to blow out if there should be a pressure buildup within the wing cavity.
E. A pressure relief panel is located on the inboard leading edge of the wing lower surface. If there should be a pressure buildup within the wing cavity, a replaceable panel within the panel is designed to blow out and thus relieve the pressure. Access to flap mechanism is provided by removing the pressure relief panel.
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747-400 MAINTENANCE MANUAL
WING LEADING EDGE ACCESS (BLOWOUT) PANEL - REMOVAL/INSTALLATION
_______________________________________________________________
1. General_______
A. This procedure contains two tasks:
(1)
The first task is the removal of the blowout panel from the wing leading edge.
(2)
The second task is the installation of the blowout panel into the wing leading edge.
(3)
Remove the blowout panel as follows:
-Loosen the screws on the outboard side of the panel
-
Remove the screws on the inboard side of the panel
-
Remove the panel out of the wing.
(4)
Install the blowout panel as follows:
-Clean and remove the remaining sealant
-Install the panel
-Tighten the bolts
-Seal the space between the skin panels
B. The blowout panels are part of the panel assemblies of the wing leading edge. You will find these panels in the wing leading edge. Directly adjacent to each side of nacelle strut, you will find one panel (total 4). The aft edge of each blowout panel is held together directly between the adjacent honeycomb panel and panel stiffener. At the forward edge of each blowout panel there are bolts installed through the blowout panel and the panel edge plate.
TASK 57-31-02-004-001
2. Panel Removal (Fig. 401)_____________
A. Access
(1) Location Zone
511 Leading Edge to Front Spar, Left
611 Leading Edge to Front Spar, Right
B. Procedure
S 024-002
(1) Remove the panel.
(a) Turn the screws many times to loosen the bolts directly outboard of the blowout panel along the longer edge.
NOTE: Do not remove these screws.
____
(b) To remove the blowout panel, remove the bolts directly inboard of the blowout panel along the shorter edge.
TASK 57-31-02-404-003
3. Panel Installation (Fig. 401)__________________
A. Consumable Materials
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