S 348-003
(2)
Polish the damaged area with the buffing wheel and buffing compound until the area is as glossy as the adjacent areas.
G. Repairs of Glossy Areas
S 348-004
CAUTION:_______DO NOT RUB THE TEDLAR LAYER OFF THE SURFACE. IF YOU REMOVE THE TEDLAR LAYER, YOU MUST DO REPAIR WORK TO REPLACE THE TEDLAR.
(1) Use the buffing wheel until the area is glossy like the
adjacent areas.
H. Repair the Pattern of the Tedlar
S 378-050
(1)
Apply silk screen ink of the correct color.
S 378-051
(2)
Let the ink air-dry for 15 minutes.
S 378-053
(3)
To reduce the gloss of the silk screen ink, lightly apply the tartan clear acrylic with a spray gun.
I. Repair Small Holes and Gouges
S 348-007
(1) Apply BMS 5-136 filler to the area with damage.
NOTE: Apply more filler than is necessary to make sure the gouge is
____ fully filled. The unwanted filler is removed in the subsequent steps.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
S 348-008
CAUTION:_______DO NOT RUB THROUGH THE TEDLAR THAT IS NOT DAMAGED. IF YOU REMOVE TEDLAR THAT DOES NOT HAVE DAMAGE, MORE REPAIR WORK IS NECESSARY.
(2)
When the filler is hard, rub the area with abrasive paper until the filler is level with the adjacent surfaces.
S 348-047
(3)
Use these steps to make a silicone embossing pad of the surface that is adjacent to the area you will repair.
(a)
Clean the surface with a clean cheescloth soaked with aliphatic naphtha.
(b)
Dry the surface with a clean cheescloth.
(c)
Make a frame, approximately 3/8-inch wide by 1/2-inch high, around the clean surface.
NOTE: Use wood, clay, or high temperature vacuum sealant tape
____
for the frame.
(d) Apply a thin layer of prepared silicone rubber on the textured surface in the frame with a brush. Continue to use the brush until you cannot see air bubbles.
NOTE: Almost all brands, types, or colors of castable silicone
____ rubber are satisfactory, but not the dark red types which contain finely divided iron oxide. Dow Corning Silastic RTV "B", "E", 587, or 93072, and General Electric RTV41 or RTV61 are preferred. Prepare the silicone rubber with the manufacturer's instructions.
(e) Pour the remaining silicone rubber on the brushed surface until it is 1/4 inch thick. Let it cure at room temperature for 48 hours.
NOTE: One pound of prepared silicone rubber will make a
____ 10-inch-by-10-inch-by-1/4-inch replica.
(f) When the silicone is dry, remove the embossing pad from the surface.
S 378-056
(4)
Apply the silk screen inks of the correct color to the repair surface.
(5)
Let it dry for 15 minutes.
S 378-057
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747-400 MAINTENANCE MANUAL
S 348-058
(6)
Apply the silicone embossing pad to the repaired surface.
S 348-095
(7)
Apply a vacuum of approximately 10 inches of mercury at 160 degrees F.
S 348-060
(8)
If the above procedure is not satisfactory, replace the decorative laminate.
J. Apply Flexible Decorative Tedlar (Non-acoustical)
NOTE: If it is necessary, repair the panel before you apply the tedlar.
____
(1) S 028-010Remove the trim strips from the panel.
(2) S 348-011Rub the area where you will apply the adhesive with abrasive paper until the area is not glossy.
(3) S 118-012Clean the area with a cheesecloth that is moist with naphtha.
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