(3)
Ducts with Polyimide Foam Insulation (Fig. 203)
(a)
Tape Replacement
(b)
Insulation Repair
(c)
Insulation Replacement
(4)
Ducts with Fiberglass Insulation and Flame-Resistant Covering (Fig. 204)
(a)
Tape Replacement
(b)
Insulation and Covering Repair
(c)
Duct Replacement
TASK 21-23-01-302-064
2. Taped Joint Repair - Fiberglass or Kevlar Duct (Fig. 201)______________________________________________
A. General
(1)
This procedure gives instructions for the repair of a taped joint that connects two sections of fiberglass or Kevlar air conditioning ducts.
(2)
This procedure may also be used to make a temporary repair to a damaged fiberglas or Kevlar air conditioning duct when time is not available to make a permanent repair or if the materials are not available to make a permanent repair. If a temporary repair is made, make the permanent repair as soon as possible.
B.
Consumable Materials
(1)
Fiberglass cloth - minimum 0.007 inch thick (MIL-C-9084 Type VIII, commercially available)
(2)
Kevlar cloth - minimum 0.007 inch thick (alternative to the fiberglass cloth)
(3)
Tape - Pressure sensitive glass cloth (Scotch No. 361) (AMM 20-30-07/201)
(4)
Plastic sheet - polyethylene or vinyl - commercially available
(5)
Primer - Dow Corning 1200
(6)
Sealant - Dow Corning 90-006
(7)
Sandpaper - 320 grit - commercially available
(8)
Solvent - Butyl carbitol (alternative to B01011, Series 91) -commercially available (AMM 20-30-91/201)
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21-23-01
ALL ú ú 01 Page 201 ú May 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
DUCT
FIBERGLASS CLOTH
CUT OR
AND RESIN
CRACK
(MIN 2 LAYERS)
MIN 2.0 INCHES
EXTERNAL PATCH - FIBERGLASS/KEVLAR DUCT
Air Conditioning System Ducts Repair (Fiberglass/Kevlar) Figure 201 (Sheet 1)
L22462
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FIBERGLASS/KEVLAR DUCTS ú 21-23-01
ú ú 01 Page 202 ú May 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
DAMAGED
DUCT
AND RESIN
STRUCTURAL REPAIR - FIBERGLASS/KEVLAR DUCT - OVERHEAD VIEW
MIN 2.0 INCHES
DUCT WALL
1/2 INCH TAPER
FIT TAPER
FOR EACH PLY
STRUCTURAL REPAIR - FIBERGLASS/KEVLAR DUCT - CROSS-SECTION VIEW
Air Conditioning System Ducts Repair (Fiberglass/Kevlar)
Figure 201 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
L22465
A
757
MAINTENANCE MANUAL
(9)
Solvent - B01011, Series 91 - commercially available
(AMM 20-30-91/201)
(10)
Wiping cloth, lint-free - commercially available
(11)
Squeegee - commercially available
C.
References
(1)
AMM 36-00-00/201, Pneumatic - General
D.
Prepare for the Repair
S 862-065
(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 862-066
(2)
On the bleed air control module on the pilots' overhead panel, P5, put the pack control switches in the OFF position.
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