(2)  
A00099 Sealant - Silicone, RTV 154

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747-400
MAINTENANCE MANUAL

PANEL
A-A

1LEFT WING SHOWN, RIGHT WING OPPOSITE
Wing Leading Edge Access (Blowout) Panel Installation Figure 401
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747-400
MAINTENANCE MANUAL

 (3)  B00624 Compound - Lubricant BMS 3-28
 B. References
 (1)  AMM 20-51-01/201, Standard Torque Values
 C. Access
 (1)  Location Zone
 511 Leading Edge to Front Spar, Left
 611 Leading Edge to Front Spar, Right

 D. Procedure
 S 424-004
 (1)  Install the panel.
 (a)  
If you use the same blowout panel, remove the silicone sealant from the lower surface of the panel edge.

 (b)  
To install a new panel edge, you must loosen and remove the screws directly forward and aft of the blowout panel on the shorter side of the panel.

 (c)  
Put the aft and forward panel edge panel into their positions between the adjacent honeycomb panel and the panel stiffener.

 (d)  
Make sure that you put the blowout panel in the center of the opening before you install the screws.

 (e)  
Apply BMS3-28 lubricant to the fasteners prior to installation (AMM 20-51-01/201).

 NOTE: The BMS 3-28 will prevent corrosion on the threads of
____ the fasteners and make them easier to remove.
 (f)  
Install the screws through the blowout panel along the forward edge of the blowout panel.

 (g)  
Make sure that the space between the inboard and outboard edges of the blowout panel and the adjacent honeycomb panels is 0.06 +/-0.03 inch.

 (h)  
Tighten the bolts directly forward and aft of the blowout panel.

 S 344-005
 (2)  Seal the panel joints.
 (a)  
Clean the space at the forward edge of the blowout panel. Use a clean bristle brush applied with the approved solvent.

 (b)  
Remove the unwanted solvent with filtered air that has no oil or water in it from an air hose.

 (c)  
For the last step to clean, lightly apply solvent with a cloth.

 (d)  
Rub to make the area dry.

 (e)  
Apply sealant to the area between the blowout panel and the honeycomb panel.

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747-400 MAINTENANCE MANUAL
 WING LEADING EDGE INBOARD PRESSURE RELIEF PANEL - REMOVAL/INSTALLATION
______________________________________________________________________
 1.  General_______
 A.  This section contains two tasks:
 (1)  
The first task is the removal of the pressure relief panel from the wing leading edge.

 (2)  
The second task is the installation of the pressure relief panel to the wing leading edge.

 B.  The removal of the panel is as follows:
 -Loosen the screws aft of the panel.
 -
Remove the screws forward of the panel.

 -
Remove the panel out of the wing.

 C.  Installation of the panel is as follows:
 -Clean off the remaining sealant.
 -Install the panel.
 -Tighten the screws.
 -Apply the sealant to the spaces between the skin and the panel.
　
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