25-01-12
ALL ú ú 02 Page 823 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
TASK 25-01-12-308-003
7. Repair Polycarbonate (Lexan), ULTEM, and Declar Plastics
________________________________________________________
A. General
(1) The paragraphs that follow give instructions to repair cracks and gouges in decorative and nondecorative plastics.
NOTE: Make sure the area you want to repair is smaller than 100
____ square inches. If the area is larger than 100 square inches, you must replace the part.
B. Consumable Materials
(1)
Adhesives
(a)
A50005 Hysol EE 1067 Resin
(b)
A00112 Hysol No. 3561 Hardener
(2)
G02022 Rubber - Silicone, Dow Corning Silastic RTV B
(3)
G02024 Rubber - Silicone, RTV 93-079, Clear
(4)
G00034 Cheesecloth - Lint-free
(5)
Solvents
(a)
B00083 Aliphatic Naphtha, TT-N-95
(b)
B00149 Methylene Chloride
(6)
G00321 Fabric-Woven prepreg glass, BMS 9-3,
class 7 Type H, H2 and H3
(7)
Finish, Internal Decorative Water Emulsion,
BMS 10-55
(a)
C00375 Type I
(b)
C00377 Type II
(8)
Finish, Silk Screen Ink - BMS 10-73
(a)
C00367 Type I
(b)
C00368 Type II
(9)
C00040 Paint - Polyurethane, BMS 10-38 Type II
(10)
B00168 Paper - Abrasive, 400 grit
C. References
(1) AMM 25-01-12/701, Equipment/Furnishings
D. Access
(1) Location Zone
200 Upper Half of the Fuselage
E. Repair Cracked Areas
S 348-079
(1)
Drill a 1/16-inch diameter hole at each end of the crack.
S 348-080
(2)
Remove material from the crack until the width of the crack is approximately equal to the thickness of the part.
(3)
Rub the surface with abrasive paper until the surface is not glossy.
S 348-081
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25-01-12
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 348-082
(4)
Clean the surface with aliphatic naphtha and a clean cheesecloth.
S 348-083
(5)
Mix the repair resin as follows:
(a) Mix 15 or 16 parts of the Hysol TE 1005 resin with one hundred parts of the No. 3561 hardener (by weight).
S 348-084
(6)
Fill the crack with the repair resin.
S 348-085
(7)
Let the repair resin cure until it is hard.
S 348-086
(8)
Apply glass fabric that is soaked with the repair resin to make the repair stronger.
NOTE: If you want to repair a decorative part, put the fabric
____
in the side that is not decorative.
The glass fabric layers must be at least as thick as the part where the crack was. Taper the glass fabric 1/2 inch for each layer at each side. If the crack is at or near an edge, the taper is not necessary.
S 348-087
(9)
Remove all the unwanted resin.
S 348-088
(10)
Let the repair cure until it is hard at a temperature
between 70 and 130°F.
(11)
Rub the area with abrasive paper until the repair is smooth.
(12)
Apply the water emulsion finish to the area.
S 348-089
S 378-090
NOTE: If you want to paint the part out of the airplane, use
____
BMS 10-83 paint (AMM 25-01-12/701).
F. Repair Gouged Areas
S 348-091
(1) If there is not a dent around the gouge,
make the gouge smooth with abrasive paper.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 EQUIPMENT/FURNISHINGS(24)
