OUTLET FOOT WARMER 
BAFFLE PLATE  D  LEVER ASSY 
Figure 2 (Sheet 2) Windshield Air and Foot Outlet Valve Control

 E79661
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 21-22-00
 WINDSHIELD AIR AND  ú
 FOOT WARMER OUTLETS  ú 01 Page 4 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 3.  Muffler
_______
 A.  A muffler is provided in the control cabin conditioned air distribution system to minimize airflow noise. A restrictor located immediately upstream of the muffler ensures balanced airflow from the control cabin outlets, and must be retained if the muffler is replaced. The muffler is located in the duct which extends from the distribution bay to the control cabin, below the passenger cabin floor outboard of the nose wheel well (Ref Fig. 1). For access remove the left side aft access panel in nose wheel well (Ref 12-31-11).
 B.  The small muffler between the under seat outlets is accessed through the forward access door, forward of the nose wheel well.
 4.  Operation
_________
 A.  The control cabin receives conditioned air when one or both of the air conditioning packs are on. On the ground, a recirculation fan will supply air flow to the main distribution system when the fan switch is placed to AUTO (Ref 21-21-22) unless L and R PACK switches are in HIGH.
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 21-22-00
 ALL  ú ú 01 Page 5 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1. ú ú ú ú
ú ú ú ú 2.
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737-300/400/500MAINTENANCE MANUAL
 CONTROL CABIN CONDITIONED AIR DUCT - REPAIRS
____________________________________________
General
_______
A.  This procedure has two tasks to repair the polycarbonate (lexan) airducts which have damage. One procedure uses a patch to repair thedamaged air duct. The second procedure uses a tape to repair the damagedair duct. The procedure which uses a patch is for a permanent repair of the air duct. The procedure which uses a tape is for a temporary repair of the air duct.
B.  This procedure also has a task to repair the aluminum alloy ducts insection 53 which are installed on the left side of the forward cargocompartment. The procedure can be used to replace a damaged duct or torepair a leak at the joint between two ducts.
 TASK 21-22-11-308-017Conditioned Air Duct - Permanent Repairs
________________________________________
 A.  Consumable Materials
 (1) Adhesive (Ref 20-30-11/201)
 NOTE: You can use one of these adhesives.
____
 (a)
A00140 - BMS 5-19, Class B

 (b)
A00955 - BMS 5-26, Class B (Proseal 890)

 (c)
A00142 - BMS 5-44, Class B (Proseal 890)

 (d)
A00145 - BMS 5-79, Class B

 (2) Patch
 NOTE: You can use one of these materials for the patch.
____
 (a)
Polycarbonate (Lexan) sheet, 0.020 inch thick

 (b)
G02042 - Aluminum sheet

 (3)
G00576 - Sandpaper - medium grit

 (4)
Solvent (Ref 20-30-31/201)

 NOTE: You can use of these solvents.
____
 (a)
B00036 - Freon 113

 (b)
B00037 - Freon TF

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 21-22-11
 ALL  ú ú 02.1 Page 801 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

DUCT JOINT
Severed Duct Joint Repair (Typical)
Figure 801

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