757
MAINTENANCE MANUAL

 S 862-162

 (2)  On the bleed air control module on the pilots' overhead panel, P5,
 put the pack control switches in the OFF position.
 S 012-164
 (3)  Remove the applicable ceiling, sidewall, or floor panels to gain
 access to the damaged air conditioning duct joint.
 S 012-165
 (4)  If insulation is installed on the duct joint, remove the insulation.
 S 342-166
 (5)  Examine the inner surface of the duct for damage.
 S 342-167
 (6)  If the inner lining is damaged, then do the Duct Section Replacement
 - Polyurethane Foam Duct procedure below.
 S 342-168
 (7)  Examine the damage to the duct. If the damage is more than 3 inches
 long or more than 5 square inches in area, do the Duct Section
 Replacement - Polyurethane Foam Duct procedure below.
 S 342-169
 (8)  Do these steps to prepare the damaged area of the duct:
 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON_______
 YOUR SKIN. DO NOT BREATHE THE FUMES FROM THE SOLVENTS.
 SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE
 FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT
 MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS
 FOR PROPER HANDLING PROCEDURES.
 (a) Use the solvent and a wiping cloth to clean the damaged area.
 (b) Sand the damaged area to remove any remaining adhesive and
 contamination.
 (c) Use the solvent and a wiping cloth to clean the damaged area.
 S 342-170
 (9)  Prepare the fiberglass cloth.
 (a) Cut two pieces of the fiberglass cloth 1/2 inch larger on all
 sides than the damaged area.
 (b) Round the corners of the fiberglass cloth pieces.
 S 342-171

 (10) Prepare the resin.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 E. Repair the Duct
 S 342-172
 (1)  Apply a thin, smooth layer of resin to the duct where the fiberglass cloth will be applied.
 NOTE: Make sure the area of the resin is larger than the size and
____
 shape of the fiberglass cloth.

 S 342-173
 (2)
Put a piece of fiberglass cloth on the resin so that it extends beyond the damaged area a minimum of 1/2 inch to all sides.

 S 342-174

 (3)  
Soak the fiberglass cloth with the applicable resin.

 S 342-175

 (4)  
Put a piece of plastic sheet on the fiberglass cloth and press lightly with a squeegee or with your hand. Make the fiberglass cloth smooth from the center to the edges of the cloth to remove any bubbles or any wrinkles and to remove unwanted resin.

 S 342-176

 (5)  
Remove the plastic sheet from the fiberglass cloth and remove unwanted resin with a wiping cloth.

 S 342-177

 (6)  
Follow the same procedure to apply the second piece of the
 fiberglass cloth.

 S 342-178

 (7)  
Let the resin cure for 24 hours at room temperature.

 S 342-179
 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM THE SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (8)  
Remove unwanted resin from the edges of the fiberglass cloth with a wiping cloth soaked with solvent.

 F.
Put the Airplane Back to Its Usual Condition

 S 412-180
 (1)  If insulation was removed from the duct joint, install new
 insulation.

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