B.
Consumable Materials
(1)
Fiberglass cloth - minimum 0.007 inch thick (MIL-C-9084 Type VIII) -commercially available
(2)
Polyurethane foam - rigid (BMS 8-133 Type I Grade 20 Form A)
(3)
Plastic sheet - polyethylene or vinyl - commercially available
(4)
Resin for repair of fiberglass duct - R109A Hetron 92 Polyester
(5)
Potting compound BMS 5-28, Type 19 (Epocast 1619A/B)
(6)
Sandpaper - 320 grit - commercially available
(7)
Solvent - Butyl carbitol (alternative to B01011, Series 91) -commercially available (AMM 20-30-91/201)
(8)
Solvent - B01011, Series 91 - commercially available (AMM 20-30-91/201)
(9)
Wiping cloth, lint-free - commercially available
(10)
Squeegee - commercially available
C.
References
(1)
AMM 36-00-00/201, Pneumatic - General
D.
Prepare for the Repair
S 862-183
(1) Release the pressure from the pneumatic system (AMM 36-00-00/201).
NOTE: This will make sure that there is no airflow in the ducts
____
when you do the repair.
S 862-184
(2)
On the bleed air control module on the pilots' overhead panel, P5, put the pack control switches in the OFF position.
S 012-186
(3)
Remove the applicable ceiling, sidewall, or floor panels to gain access to the damaged air conditioning duct joint.
(4)
If insulation is installed on the duct joint, remove the insulation.
(5)
Examine the inner surface of the duct for damage.
S 012-187
S 342-188
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21-23-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 342-189
(6)
If the inner lining is damaged, then do the Duct Section
Replacement - Polyurethane Foam Duct procedure below.
S 342-190
(7)
Examine the damage to the duct. If the damage is more than half the thickness of the foam duct material, then do the Duct Section Replacement - Polyurethane Foam Duct procedure below.
S 342-191
(8)
Do these steps to prepare the air conditioning duct.
(a)
Remove the damaged portion of the outer lining and the damaged foam material.
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.
(b)
Use the solvent and a wiping cloth to clean the damaged area.
(c)
Sand the duct outer surface a minimum of 2 inches from the edges of the damaged area to remove any remaining adhesive and contamination.
(d)
Use the solvent and a wiping cloth to clean the damaged area.
S 342-192
(9) Cut a piece of the polyurethane foam to fit the area where the damaged foam was removed.
NOTE: Put the foam in the opening to make sure it is the correct
____
size and shape.
S 342-193
(10)
Prepare the fiberglass cloth.
(a)
Cut two pieces of the fiberglass cloth 2 inches larger on all sides than the damaged area.
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