(11)
Rub the area with abrasive paper until the repair is smooth.
(12)
Apply the water emulsion finish to the area.
S 378-090
NOTE: If you want to paint the part out of the airplane, use
____
BMS 10-83 paint (Ref 25-00-00/701).
F. Repair Gouged Areas
S 348-156
(1) If there is not a dent around the gouge,
make the gouge smooth with abrasive paper.
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S 348-157
(2)
If the appearance is not satisfactory after it is smooth, fill the gouge with repair resin. Finish the repair with the steps given in the Repair Cracked Areas procedure.
S 348-158
(3)
If the surface has dents, remove the area with dents and do the procedure to repair the cracked areas.
TASK 25-00-00-308-020
9. Repair Urethane Foam
____________________
A. General
(1) The paragraphs that follow give instructions to repair urethane foam material with two procedures.
B. Standard Tools and Equipment
(1)
Bore - Cork
(2)
Squeegee - Commercially available
C. Consumable Materials
(1)
Adhesives
(a)
A00028 EC 2216 A/B
(b)
A00188 BMS 5-105, Type I or II
(c)
A00216 BMS 5-28, Epocast 1618 A/B
(2)
G00111 Film - Mylar
(3)
D00506 Lubricant - Light Machine Oil
(4)
G00123 Tape - Double-backed, 2-inches wide,
Permacel No. 94
D. Access
(1) Location Zone
200 Upper Half of the Fuselage
E. Repair the Foam with a Plug
S 358-094
(1) Remove the damage with a cork bore or an equivalent tool.
NOTE: The tool size must be equal to the size of the damaged
____ area, or up to a 1/2-inch larger in diameter.
S 358-095
(2)
Use the same tool to cut a repair plug from foam to fit in damaged area.
S 358-096
(3)
Apply a layer of the BMS 5-105 adhesive to each surface of the repair plug and the damaged area.
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S 358-097
(4) Let the adhesive dry until it is tacky. Then push the repair plug into the damaged area with hand pressure.
NOTE: Do not stress the adhesive bond for 24 hours.
____
F. Repair the Foam with Adhesive Resin
S 358-098
(1) Remove the damage with a cork bore or an equivalent tool.
NOTE: The tool size must be equal to the size of the damaged
____ area, or up to a 1/2-inch larger in diameter.
S 358-099
(2)
Use the manufacturer's instructions to mix the Epocast 1618A/B.
S 358-100
(3)
Fill the area fully with the Epocast (potting compound).
S 358-101
(4)
Put a sheet of mylar film over the potting compound.
NOTE: The mylar film must go approximately 2 inches more than the
____ outer edge of all sides of the filled area.
S 358-102
(5)
Put a small amount of the lubricant on the top surface of the mylar film.
S 358-103
(6)
Start at the center of the repair and rub the potting compound with a squeegee until you get the shape necessary.
(7)
Apply double-backed tape to hold the mylar film in position.
S 358-105
(8)
Let the compound cure for 1 hour at room temperature and then 5 hours at 115°F.
(9)
Carefully remove the mylar film after the compound has cured.
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