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

 F.
Put the Airplane Back to Its Usual Condition

 S 412-309
 (1)  
Reinstall the duct (if removed).

 S 412-310

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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-23-01
 ALL  ú ú 01 Page 240 ú May 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 TASK 21-23-01-212-313
 16. Duct Replacement - Duct with Fiberglass Insulation and Flame-Resistant
______________________________________________________________________ Covering (Fig. 203)
________
 A. General
 (1)  
This procedure gives instructions to replace an air conditioning duct with fiberglass insulation (BMS 8-48) with flame-resistant covering (BMS 8-142) with an air conditioning duct with Polyimide foam insulation (BMS 8-300).

 B.
Consumable Materials

 (1)  
Air conditioning duct with Polyimide foam insulation

 C.
References

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

 D.
Prepare for the Repair

 S 862-311
 (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 862-312
 (2)  
On the bleed air control module on the pilots' overhead panel, P5, put the pack control switches in the OFF position.

 S 012-315

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

 S 012-316

 (4)  
Remove the air conditioning duct with fiberglass insulation and flame-resistant covering.

 E.
Install the Duct with Polyimide Foam Insulation

 S 412-326
 (1)  
Install a new section of duct insulated with the Polyimide foam insulation (BMS 8-300) (Fig. 203).

 F.
Put the Airplane Back to Its Usual Condition

 S 412-317
 (1)  Replace the panels or other airplane structure removed to gain access to the duct joint.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-23-01
 ALL  ú ú 01 Page 241 ú Sep 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 OVERHEAD DISTRIBUTION DUCT - REMOVAL/INSTALLATION
_________________________________________________
 1.  General_______
 A.  This procedure has instructions to remove and install a section of the overhead distribution duct.
 TASK 21-23-01-004-001
 2.  Overhead Distribution Duct Removal (Fig. 401)__________________________________
 A.  References
 (1)  
AMM 25-22-01/401, Sculptured Ceiling Panels Removal/Installation

 (2)  
AMM 25-28-05/401, Center Overhead Storage Compartment

 B.  
Access

 (1)  
Location Zones 233/234 Passenger cabin - Section 43 - Body Station 663.25 to 803.25

 C.  
Prepare for the Removal

 S 864-003
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-004

 (2)  
Push the L and R RECIRC FAN switch-lights, on the pilots overhead P5 panel, to the OFF position.

 (a)  
Make sure the INOP lights come on.

 (b)  
Put a DO-NOT-OPERATE tag on the switch-lights.

 S 864-005
 (3)  
Turn the L and R PACK selectors, on the P5 panel, to the OFF position.

 (a)  
Make sure the PACK OFF lights come on.

 (b)  
Put a DO-NOT-OPERATE tag on the selectors.

 S 014-006
 (4)  
Remove the applicable sculptured ceiling panel in the passenger compartment to get access to the duct. (AMM 25-22-01/401, Sculptured Ceiling Panels Removal/Installation)
　
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