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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B. Consumable Materials
 (1)  
Fiberglass cloth - minimum 0.007 inch thick (MIL-C-9084 Type VIII) -commercially available

 (2)  
Kevlar cltoh - minimum 0.007 inch thick (alternative to the
 Fiberglass cloth)

 (3)  
Plastic sheet - polyethylene or vinyl (commerically available)

 (4)  
Resin for repair of Fiberglass duct - R109A Hetron 92 Polyester

 (5)  
Resin for repair of Kevlar duct - BMS 8-201 Type II (Epocast 50-A)

 (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)  
Squeegee - commercially available

 (10)
 Wiping cloth, lint-free (commercially available)

 C. References
 (1)  AMM 36-00-00/201, Pneumatics - General
 D. Prepare for the Repair
 S 868-061
 (1)  
Remove the pneumatic power (AMM 36-00-00/201).

 S 868-062

 (2)  
On the bleed air control module on the pilots' overhead panel, put the pack control switches in the OFF position.

 S 018-063

 (3)  
Remove the applicable ceiling, sidewall, or floor panels to gain access to the damaged air conditioning duct.

 S 028-069

 (4)
If insulation is installed on the duct, remove the insulation.

 S 348-065

 (5)  
Do these steps to prepare the damaged area of the duct:

 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR IN YOUR EYES, OR ON
_______ YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIROMENT. 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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-23-02
 ALL  ú ú 01A Page 809 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b) Cut away the damaged area to make a rounded opening with a
 smooth shape.
 NOTE: Cut the sides of the opening at an angle to make a taper____
 of 1/2-inch between each ply of material.
 (c) Sand the edge of the opening to make a smooth surface.
 (d) Sand the surface of the duct around the opening a distance of
 1/2-inch for each ply in the duct.
 NOTE: For example, if there are 6 plies, sand 3-inches from____
 the opening on all sides (1/2 x 6 = 3-inches).
 (e) Use the solvent and a wiping cloth to clean the edge of the
 opening and the sanded surface of the duct.
 S 348-070
 (6)  Prepare the Fiberglass or Kevlar cloth:
 (a) Cut sufficient pieces of cloth to equal the thickness of the
 duct.
 (b) Cut each piece of the cloth 1/2 inch larger to fit the taper of
 the opening.
 (c) Cut one piece of cloth a minimum of 2 inches larger on all
 sides than the opening in the duct.
 S 348-071
 (7)  Cut a piece of plastic sheet 2 to 3 inches larger on all sides than
 the opening.
 S 348-072
 (8)  Cut a piece of cardboard or aluminum 2 to 3 inches larger than the
 opening on all sides.
 S 348-073
 (9)  Attach the plastic sheet to the inside of the opening with adhesive
 tape so that it covers the opening.
 S 348-074

 (10)
 Attach the cardboard or aluminum to the inside of the opening with adhesive tape so that it covers the opening and provides support for the plastic sheet.

 S 348-075

 (11)
 Prepare the applicable resin.

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