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A
737-300/400/500MAINTENANCE MANUAL
 (b)  
Dry the damaged area with a clean cloth before the solvent dries.

 (c)  
Apply one layer of the 3-inch wide tape to the crack in the duct.

 NOTE: The tape must make a 1-inch overlap around the crack.
____
 S 438-023
 (6)  
Install the insulation which you removed from the duct.

 S 438-024

 (7)  
Install the duct clamps.

 S 418-025
 (8) Install the items which you removed to get access to the air duct. ú ú ú TASK 21-22-11-308-030 ú4.ú Conditioned Air Duct (Aluminum Alloy) - Repair ú A. Consumable Materials ú (1) Insulation - Polyimide Foam (BMS 8-300 Type II Grade 0.6, 0.375 inch ú thick) ú (2) Solvent (AMM 20-30-51/201) ú (a) B00036 - Freon 113 (TF) ú (b) 1,1,1 Trichloroethane, O-T-620 ú (3) Tape, Vinyl (two inches) - Joint repair ú (a) Venture Tape No. 959 ú Venture Tape Corp. ú 30-T Commerce Rd. ú Rockland, MA. 02370 ú (b) 3M No. 474 - Vinyl, 2-inches wide ú (c) Nomex Fabric HT1-41 ú (4) Tape - Insulation installation or repair (BMS 5-149, Type XI, Class ú 1 or 2, Grade C, Form 1 ú (a) Product Designation 78-C or 70-1C ú E & H Laminating and Slitting Co. ú 138 Grand Street ú Paterson, JN 07501 BMS 5-149, Type XI, Class 1 or 2, Grade C, ú Form 1 ú (5) Wipers, Cheesecloth (AMM 20-30-51/201) ú B. References ú (1) AMM 36-05-00/201 Pneumatic System - Pressurize/Depressurize ú C. Access ú (1) Location Zone ú 208 Forward Cargo Compartment ú D. Procedure ú ú S 868-032 ú (1) Make sure that the L and R PACK switches on the P5-10 panel on the ú forward overhead panel are set to OFF.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A 737-300/400/500MAINTENANCE MANUAL

FLIGHT DECK CONDITIONED AIR SUPPLY DUCT
(TYPICAL DUCT INSTALLATION)

Center Cabin Conditioned Air Supply Duct Repair
Figure 802

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A 737-300/400/500MAINTENANCE MANUAL
 ú
 ú  S 018-028
 ú  (2)  Open the forward cargo compartment door.
 ú
 ú  S 018-029
 ú  (3)  Remove all items necessary to get access to the duct.
 ú
 ú  S 028-039
 ú  (4)  If required, remove the fasteners, jumper assembly (if installed)
 ú  and clamps that attach the duct to the passenger cabin floor beams.
 ú
 ú  S 018-031
 ú  (5)  Remove the insulation that covers the duct joint.
 ú
 ú  S 368-033
 ú  (6)  Do these steps to repair the duct joint:
 ú  (a) Remove the tape from the joint.
 ú  (b) Use the solvent to remove all traces of the adhesive from the
 ú  tape.
 ú  (c) Remove all traces of the solvent with the wipers.
 ú  (d) Apply two laps of the tape to the center of the joint.
 ú  1) Pull the tape tight and smooth as you apply it.
 ú
　
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