S 012-292

 (4)  
Remove the duct to permit removal of the insulation.

 S 012-293

 (5)
Remove all tape and existing insulation from the duct.Install the Insulation

 S 412-323

 (1)  
Do these steps to install a new section of Polyimide foam insulation (BMS 8-300) around 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 outer surface of the insulation.

 (b)  
Wrap the insulation around the duct.

 (c)  
Install strips of 2-inch wide adhesive tape to the edges and seams of the insulation as shown in Figure 203 to hold it to the duct.

 (d)  
Make sure the adhesive tape overlaps all the edges and seams of

 the insulation by a minimum of 1-inch.Put the Airplane Back to Its Usual Condition
 S 412-294
 (1)  
Reinstall the duct.

 S 412-295

 (2)  
Replace the panels or other airplane structure removed to gain access to the duct joint.

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 21-23-01
 ú  ALL  ú
 ú ú  ú 01.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 235Sep 28/02 

A

757
MAINTENANCE MANUAL

INSULATION

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 204
L22486
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 21-23-01
 FLAME-RESISTANT COVERING  ú ú 01 Page 236 ú May 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 TASK 21-23-01-302-266
 14. Tape Replacement - Duct with Fiberglass Insulation and Flame-Resistant
______________________________________________________________________ Covering (Fig. 204)
________
 A. General
 (1)  
This procedure gives instructions to replace old or loose adhesive tape on air conditioning ducts insulated with fiberglass insulation (BMS 8-48) and a flame-resistant covering (BMS 8-142) which has been wrapped with cargo liner joint sealing tape (BMS 5-146).

 B.
Consumable Materials

 (1)  
Tape - Cargo Liner Joint Sealing (BMS 5-146, Type I) (AMM 20-30-07/201)

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

 (3)  
Wiping cloth, lint free - commercially available

 C.
References

 (1)  
AMM 36-00-00/201, Pneumatic - General

 D.
Prepare for the Repair

 S 862-296
 (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 862-297
 (2)  
On the bleed air control module on the pilots' overhead panel, P5, put the pack control switches in the OFF position.

 S 012-298

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

 (4)  
Remove the duct if needed for better access.

 S 012-300

 (5)  
Remove all loose or old cargo liner joint sealing tape from the insulation/covering.

 S 012-299
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 21-23-01
　
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