(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.
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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