(6)  
Wiping cloth, lint-free - commercially available

 (7)  
Squeegee - commercially available

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A 737-300/400/500MAINTENANCE MANUAL

AND RESIN
(MIN 2 LAYERS)

EXTERNAL PATCH - POLYURETHANE FOAM DUCT
Air Conditioning System Ducts Repair (Polyurethane Foam)

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L29110
A
737-300/400/500MAINTENANCE MANUAL
DAMAGED AREA WITH FOAM PLUG

AND RESIN JOINT AND RESIN JOINT
DUCT SECTION REPLACEMENT - POLYURETHANE FOAM DUCT

Air Conditioning System Ducts Repair (Polyurethane Foam)
Figure 202 (Sheet 2)

L29115
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A
737-300/400/500MAINTENANCE MANUAL
 C. References
 (1)  AMM 36-05-00/201, Pneumatic - General
 D. Prepare for the Repair
 S 862-057
 (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 862-058
 (2)  
On the bleed air control module on the pilots' overhead panel, P5, put the pack control switches in the OFF position.

 S 012-059

 (3)  
Remove the applicable ceiling, sidewall, or floor panels to gain access to the damaged air conditioning duct joint.

 S 012-060

 (4)
If insulation is installed on the duct, remove the insulation.

 S 862-061

 (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.

 (c)  
Use the solvent and a wiping cloth to clean the damaged area.

 S 342-062
 (6)  
Examine the end of each air conditioning duct for damage.

 S 342-063

 (7)  
If the duct lining is damaged so that the foam core of the duct shows, then do the Duct End Repair - Polyurethane Foam Duct procedure below.

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737-300/400/500MAINTENANCE MANUAL
 S 342-064
 (8)
Cut a piece of the fiberglass cloth that is 3 inches wide and is long enough to wind around the duct a minimum of two times.

 S 342-065

 (9)  
Prepare the resin.

 E. Repair the Taped Joint
 S 342-066
 (1)  
Apply resin to the duct ends.

 S 342-067

 (2)  
Let the resin partially dry until it is sticky.

 S 342-068

 (3)  
Press the duct ends together by aligning the installation
　
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