757
MAINTENANCE MANUAL

 WARNING:_______DO NOT BREATH THE ASBESTOS DUST. PUT ON A PROTECTIVE RESPIRATOR WHEN YOU DRILL THE LAVATORY PANELS. THE ASBESTOS DUST CAN GET IN YOUR MOUTH OR NOSE IF YOU DO NOT USE THE PROTECTIVE RESPIRATOR AND CAN CAUSE CANCER OR LUNG DISEASE.
 (2)  Obey this WARNING during all of this task.
 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,
 Type H, H-2, H-3, Class 3 or 4.

 (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)  25-00-00/701, Equipment/Furnishings
 D. Access
 (1)  Location Zone
 200 Upper Half of the Fuselage

 E. Repair Cracked Areas
 S 348-152
 (1)  
Drill a 1/16-inch diameter hole at each end of the crack.

 S 348-153

 (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.

 (4)
Clean the surface with aliphatic naphtha and a clean cheesecloth.

 S 348-154
 S 348-155
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 S 348-156
 (5)  Mix the repair resin as follows:
 (a)  Mix 15 or 16 parts of the A50005 Hysol EE 1067 with one hundred parts of the No. 3561 hardener.
 S 348-157
 (6)  
Fill the crack with the repair resin.

 S 348-158

 (7)  
Let the repair resin cure until it is hard.

 S 348-159

 (8)  
Apply glass fabric that is soaked with the repair resin to make the repair stronger.

 NOTE: If you will 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 348-160
 (9)  
Remove all the unwanted resin.

 S 348-161

 (10)
 Let the repair cure until it is hard at a temperature
 between 70 and 130°F.

 S 348-162

 (11)
 Rub the area with abrasive paper until the repair is smooth.

 S 378-163

 (12)
 Apply the water emulsion finish to the area.

 NOTE:____If you will paint the part out of the airplane, use BMS 10-83 paint (Ref 25-00-00/701).
 F. Repair Gouged Areas
 S 348-164
 (1)  
If there is not a dent around the gouge,
 make the gouge smooth with abrasive paper.

 S 348-165

 (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.

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