(2)
This procedure may also be used to make a temporary repair to an 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)
Plastic sheet - polyethylene or vinyl - commercially available
(4)
Primer - Dow Corning 1200
(5)
Sandpaper - 320 grit (commerically available)
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MAINTENANCE MANUAL
DUCT
FIBERGLASS CLOTH AND RESIN (MIN 2 LAYERS) MIN 2.0 INCHES
EXTERNAL PATCH - FIBERGLASS/KEVLAR DUCT
Air Conditioning System Ducts Repair (Fiberglass/Kevlar) Figure 801 (Sheet 1)
L24483
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747-400
MAINTENANCE MANUAL
DAMAGED
AND RESIN
STRUCTURAL REPAIR - FIBERGLASS/KEVLAR DUCT - OVERHEAD VIEW
STRUCTURAL REPAIR - FIBERGLASS/KEVLAR DUCT - CROSS-SECTION VIEW
Air Conditioning System Ducts Repair (Fiberglass/Kevlar)
Figure 801 (Sheet 2)
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MAINTENANCE MANUAL
(6)
Sealant - Dow Coring 90-006
BAC5010 type 98 (Alternate)
BMS5-7 type 2 (Alternate)
(7)
Solvent - Butyl carbitol (alternative to B01011, Series 91) -commerically available (AMM 20-30-91/201)
(8)
Solvent - B01011, Series 91 - commerically available
(AMM 20-30-01/201)
(9)
Squeegee - commercially available
(10)
Tape - Pressure sensitive glass cloth (Scotch No. 361)
(AMM 20-30-04/201)
(11)
Wiping cloth, lint-free (commercially available)
C. References
(1) AMM 36-00-00/201, Pneumatics - General
D. Prepare for the Repair
S 868-002
(1)
Remove the pneumatic power (AMM 36-00-00/201).
S 868-003
(2)
On the bleed air control module on the pilots' overhead panel, put the pack control switches in the OFF position.
S 018-004
(3)
Remove the applicable ceiling, sidewall, or floor panels to gain access to the damaged air conditioning duct joint.
S 028-067
(4)
If insulation is installed on the duct joint, remove the insulation.
S 348-006
(5)
Do these steps to prepare the damaged area of the duct:
WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR IN YOUR EYES, OR ON
_______ YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIROMENT. 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 duct joint area to remove any remaining adhesive and contamination.
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