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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 884-041
 (17) Listen and feel for leakage at all duct joints that were disconnected.
 NOTE: Weak leakage that cannot be isolated to a specific area
____ is permitted at a connection. Weak leakage cannot be felt 12-inches away from a connection. Leakage that can be felt 12-inches away from a connection is not permitted.
 S 864-042
 (18)
 Stop the operation of the air cycle system (AMM 21-00-00/201).

 S 864-043

 (19)
 Release the pressure of the pneumatic system if it is not necessary (AMM 36-05-00/201).

 S 864-044

 (20)
 Remove the electrical power if it is not necessary (AMM 24-22-00/201).

 (21)
 Close the equipment bay for the air conditioning equipment.

 (22)
 Close the access doors for the ram air duct.

 S 414-045
 S 414-046
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 HEAT EXCHANGERS - CLEANING
__________________________
 1.  General_______
 A.  This procedure has one task. The task is to clean the primary and secondary heat exchangers of the air cycle system.
 B.  The heat exchangers are cleaned with a detergent that flows through the heat exchangers in the opposite direction of the ram air. Air from the APU or from a high pressure ground cart can be used to move the detergent through the heat exchangers.
 TASK 21-51-21-107-001
 2.  Primary and Secondary Heat Exchangers Cleaning______________________________________________
 A.  Equipment
 (1)  
C21002-20 Reverse Flusher - Heat Exchanger

 (2)  
PF80-012-500 Deactivator - Check Valve, Industrial Automation, Inc. (Preferred Tool) 1421 S 93rd Street, Seattle, WA 98108

 (3)  
PF80-012 Deactivator - Check Valve, PF Industries Inc. (Optional Tool)

 (4)  
High Pressure Ground Cart

 B.  Consumable Materials
 (1)  B00541 - Detergent, P-D-220, diluted with water as suggested by the manufacturer.
 C.  References
 (1)  49-11-00/201, APU Power Plant
 D.  Access
 (1)  
Location Zones
 211 Left Ram Air Duct
 212 Left Air Conditioning Equipment Bay
 213 Right Ram Air Duct
 214 Right Air Conditioning Equipment Bay

 (2)  
Access Panels
 3303L A/C Access Panel
 3403R A/C Access Panel
 3404R A/C Access Door

 E.  Prepare to Clean the Heat Exchangers
 S 867-002
 (1) Set the position of these switches on the P5-10 panel as follows:
 (a)  
Set the APU BLEED switch to OFF.

 (b)  
Set the L PACK and R PACK switches to OFF.

 (c)  
Set the ISOLATION VALVE switch to OPEN.

 S 867-006
 (2)  
Make sure that the inlet doors and the exit louvers for the ram air are fully open.

 (3)  
Open the bay doors to the air conditioning equipment.

 S 017-004
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

(OR THE APU)
Heat Exchanger Reverse Flusher Installation
Figure 701

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