FIBERGLASS INSULATED DUCT
(EXAMPLE)

COVER ALL EXPOSED INSULATION WITH CARGO LINER JOINT SEALER TAPE. CUT TAPE AS REQUIRED TO FIT AROUND AIR OUTLETS.
Air Conditioning System Insulated Duct Repair (Fiberglass) Figure 804
L24518
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 FLAME-RESISTANT COVERING  ú ú 01A Page 838 ú Jun 18/00
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A
747-400 MAINTENANCE MANUAL
 TASK 21-23-02-308-031
 12. Fiberglass Insulated Duct Repair (Fig. 804)________________________________
 A. General
 (1)  
This procedure has instructions to repair those air conditioning ducts insulated with Fiberglass insulation (BMS 8-48) and a flame-resistant covering (BMS 8-142) which have been overwrapped with cargo liner joint sealing tape (BMS 5-146).

 (2)  
This procedure has these repair instructions:

 (a)  
Replacement of loose or old tape (Repair Method 1)

 (b)  
Repair of cuts or tears in the flame-resistant covering and Fiberglass insulation (Repair Method 2)

 (c)  
Replacement of the Fiberglass insulated duct with duct insulated with Polyimide foam insulation (Repair Method 3)

 B. Consumable Materials
 (1)  
Tape - Cargo Liner Joint Sealing (BMS 5-146, Type I) (AMM 20-30-04/201)

 (2)  
Solvent - B01011, Series 91 - commercially available (AMM 20-30-91/201)

 (3)  
Wiping cloth, lint free - commercially available

 C. Access
 (1)  Location Zones
 200 Upper Half of Fuselage

 D. Tape Replacement (Repair Method 1)
 S 028-032
 (1)  
Remove the duct if needed for better access.

 S 028-033

 (2)  
Remove all loose or old cargo liner joint sealing tape from the insulation/covering.

 S 168-034
 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.
 (3)  Use the solvent and a wiping cloth to clean the surface of the insulation/covering where new tape will be installed.
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 ALL  ú ú 01A Page 839 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 428-035
 (4)  Install new cargo liner joint sealing tape (BMS 5-146) to completely cover all of the insulation/covering as shown in Figure 804.
 (a)  
Use a continuous strip of tape to wrap around the insulation/covering and the duct.

 (b)  
Make sure the new tape overlaps the edges of the adjacent tape by a minimum of 1/8-inch.

 (c)  
Make sure the new tape overlaps onto the ends of the duct by a minimum of 1-inch.

 S 428-036
 (5)  Re-install the duct (if removed).
 E. Cuts or Tears in Fiberglass Insulation/Covering (Repair Method 2)
 S 028-037
 (1)  Remove the duct if needed for better access.
 S 168-038
 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.
 (2)  
Use the solvent and a wiping cloth to clean the surface of the insulation/covering around the damaged area.

 S 428-039

 (3)  
Apply a minimum 2-inch wide patch of cargo liner joint sealing tape (BMS 5-146) to completely cover the damaged area on the insulation/covering.

 (a)  Make sure to apply a large enough patch to assure full coverage of the damaged area with a minimum 1/2-inch overlap.
 S 428-040
　
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