S 212-027
(4) Identify the type of seal necessary to do the repair.
S 212-028
CAUTION:_______DO NOT MIX THE SEALING MATERIALS. THE SEALING MATERIALS CAN CONTAMINATE EACH OTHER AND CAUSE POOR ADHESION.
(5) Identify the type of sealant that is used in the damaged area.
NOTE: Refer to AMM 20-30-01/201 for the type of sealants that are
____ available.
S 362-029
CAUTION:_______USE HARDWOOD OR PLASTIC CUTTING TOOLS. DO NOT USE METAL CUTTING TOOLS. THE METAL CUTTING TOOLS CAN CAUSE DAMAGE TO THE AIRPLANE SURFACE.
(6)
Remove all of the old sealant in the damaged area.
S 362-030
(7)
Remove all the loose pieces of the sealant from the damaged areas.
(a) Do not attempt to apply new sealant over cured/damaged sealant.
S 102-031
(8) Do these steps to clean the damaged area immediately before you apply the sealant:
(a)
Make sure you clean an area that is wider than necessary to apply the sealant.
(b)
Make sure you remove the grease, oil, dirt, and loose particles.
(c)
Make sure you use a clean cheesecloth that is moist with solvent.
(d)
Continue to clean the area with the clean cheesecloth until there is no sign of grease, oil, dirt, or loose particles on the cheesecloth.
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51-31-01
ALL ú ú 02 Page 202 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(e)
Make sure the solvent is removed from the area with a dry, clean cheesecloth before the solvent dries.
(f)
Use compressed air to remove the remaining solvent from the area.
(g)
If a large quantity of primer was accidentally removed from the area, then you must apply more primer to the area after you apply the sealant.
TASK 51-31-01-912-114
3. Non-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. Procedure
S 302-033
(1) Do the Prepare for Sealing task.
S 392-034
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.
(2) 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 mating surface (Fig. 201).
NOTE: The thickness of the sealing compound must be 1/32 inch.
____
S 432-035
(3) Put the component parts together. Install the necessary fasteners.
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