(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 20-30-51/201)
(4)
Plastic sheet - polyethylene or vinyl - commercially available
(5)
Primer - Dow Corning 1200
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21-23-25
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE 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)
L29108
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FIBERGLASS/KEVLAR DUCTS ú 21-23-25
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
DAMAGED
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
L29109
A
737-300/400/500MAINTENANCE MANUAL
(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)
(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 36-05-00/201, Pneumatic - General
D. Prepare for the Repair
S 862-002
(1) Release the pressure from the pneumatic system (AMM 36-05-00/201).
NOTE: This will make sure that there is no airflow in the ducts
____
when you do the repair.
S 862-003
(2)
On the bleed air control module on the pilots' overhead panel, P5, put the pack control switches in the OFF position.
S 012-004
(3)
Remove the applicable ceiling, sidewall, or floor panels to gain access to the damaged air conditioning duct joint.
S 012-005
(4)
If insulation is installed on the duct joint, remove the insulation.
S 342-006
(5)
Do these steps to prepare the damaged area of 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 damaged area.
(b)
Sand the damaged area to remove any remaining adhesive and contamination.
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