(b)
Make sure the new tape overlaps the edges of the adjacent tape by a minimum of 1/8-inch.
(c)
Make sure the new tape overlaps onto the ends of the duct by a minimum of 1-inch.
F. Put the Airplane Back to Its Usual Condition
S 412-219
(1)
Reinstall the duct (if removed).
S 412-220
(2)
Replace the panels or other airplane structure removed to gain access to the duct joint.
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A
737-300/400/500MAINTENANCE MANUAL
TASK 21-23-25-212-221
15. Insulation Repair - Duct with Fiberglass Insulation and Flame-Resistant
_______________________________________________________________________ Covering (Fig. 204)
________
A. General
(1) This procedure gives instructions to repair cuts or tears in the insulation on air conditioning ducts with fiberglass insulation (BMS 8-142) with flame-resistant covering (BMS 8-142) that has been wrapped with cargo liner joint sealing tape (BMS 5-146).
B. Consumable Materials
(1)
Tape - Cargo Liner Joint Sealing (BMS 5-146, Type I) (AMM 20-30-51/201)
(2)
Solvent - B01011, Series 91 - commercially available (AMM 20-30-91/201)
(3)
Wiping cloth, lint free - commercially available
C. References
(1) AMM 36-05-00/201, Pneumatic - General
D. Prepare for the Repair
S 862-222
(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 862-223
(2)
On the bleed air control module on the pilots' overhead panel, P5, put the pack control switches in the OFF position.
S 012-224
(3)
Remove the applicable ceiling, sidewall, or floor panels to gain access to the damaged air conditioning duct joint.
(4)
Remove the duct if needed for better access.
S 012-225
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
S 162-226
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.
(5) Use the solvent and a wiping cloth to clean the surface of the insulation/covering around the damaged area.
E. Repair the Insulation
S 412-227
(1) Apply a minimum 2-inch wide patch of cargo liner joint sealing tape (BMS 5-146) to completely cover the damaged area on the insulation/covering.
(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 412-228
(1)
Reinstall the duct (if removed).
S 412-229
(2)
Replace the panels or other airplane structure removed to gain access to the duct joint.
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