(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)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
FIBERGLASS/KEVLAR DUCTS ú 21-23-01
ú ú 01 Page 203 ú May 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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.
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：757 AMM 飛機維護手冊 空調 AIR CONDITIONING 1(28)
