51-31-01
 ALL  ú ú 02 Page 203 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

APPROXIMATELY
SEALANT

0.06 INCH

FAYING (MATED) SURFACE
FAYING (MATED) SURFACE SEE

STEP 1
MAKE THIS SEALANT FLUSH AS SHOWN

STEP 2
REMOVABLE SEALS
(THE SEALANT IS APPLIED IMMEDIATELY BEFORE THE
ACCESS PANEL IS INSTALLED)

AFTER ASSEMBLY OF THE PARTS, THE SEALANT MUST AGREE WITH THIS DIMENSION
Faying Surface Seal Figure 201
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 51-31-01
 ALL  ú ú 01 Page 204 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 212-036
 (4)  
If you will seal the fasteners, make sure you install them during the pot life of the sealing compound.

 S 492-037

 (5)  
If you cannot install the permanent fasteners before the pot life of the sealing compound ends, use temporary fasteners to hold the parts together until the sealing compound dries.

 S 392-038

 (6)  
Install the permanent fasteners with the new sealant. Apply the sealant on the fastener or in the hole.

 S 212-039

 (7)  
Remove the unwanted sealant.

 (a)  Make sure the faying (mated) surface is smooth and the squeeze out is approximately 0.06 inch along the joint.
 TASK 51-31-01-392-032
 4.  Removable Faying (Mated) Surface Seal Application_________________________________________________
 A. General
 (1)  
You must clean all the equipment before and after you apply the sealing compound.

 (2)  
When the sealing compounds are used with an activator, you must clean the equipment before the compounds become hard.

 (3)  
Do not mix the tools that you use for silicone with the tools that you use for the non-silicone materials.

 (4)  
Do not apply the materials, which are used to smooth, fair, and seal, on the zinc chromate primer until the primer is hard and strong.

 B. Equipment
 (1)  
Spatula made of wood or plastic

 (2)  
Sealing gun and nozzles

 C. Consumable Materials
 (1) G00771 Parting Agent - Green Strippable Vinyl Coating 4A-183
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 ALL  ú ú 01 Page 205 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 D. Procedure
 S 302-106
 (1)  Do the Prepare for Sealing task.
 S 392-041
 CAUTION:_______DO NOT LET A WET PARTING AGENT TOUCH AN ACRYLIC SURFACE. IF A WET PARTING AGENT TOUCHES AN ACRYLIC SURFACE, DAMAGE TO THE ACRYLIC SURFACE CAN OCCUR.
 (2)  
Apply the parting agent to one of the mating surfaces. If one of the mating surfaces is acrylic, apply the parting agent to the non-acrylic surface.

 S 392-042

 (3)  
When the parting agent is sufficiently dry to touch, apply the sealant to the opposite mating surface.

 S 392-107
 CAUTION: DO NOT CAUSE A BLOCKAGE WHEN YOU APPLY SEALANT NEAR OR AROUND
_______ THE FUSELAGE DRAIN HOLES, TUBES, OR PATHS. THE FUNCTION OF THE DRAIN HOLES IS TO DRAIN CONDENSATION AND FLUIDS OVERBOARD. IF YOU CAUSE A BLOCKAGE, FLUIDS WILL COLLECT IN THE AIRPLANE. THE FLUIDS CAN CAUSE CORROSION TO THE STRUCTURE, OR A FIRE IF THE FLUIDS ARE FLAMMABLE.
 (4)  Apply permenant seal by applying sealant compound to one surface with a flow gun or spatula. Make sure you apply the sealing compound on the full area of the faying (mated) surface (Fig. 201).
 NOTE: The thickness of the sealing compound must be 1/32 inch.
____
 S 432-108
 (5)
Put the component parts together. Install the necessary fasteners.

 S 212-109

 (6)  
If you will seal the fasteners, make sure you install them during the pot life of the sealing compound.
　
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