separator is fully open. 2) Do a BITE test of the 35°F control system.

 (c)  
Remove and replace the defective component.

 S 975-137
 (6)  Write down the position of the 35°F control valve for the left water separator.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-138
 (7)  
Set the L PACK switch to OFF.

 S 865-139

 (8)  
Set the R PACK switch to HIGH.

 S 975-140

 (9)  
Write down the SUPPLY DUCT temperature.

 S 975-141

 (10)
 Make sure that the SUPPLY DUCT temperature is between 32°F (0°C) and 42°F (6°C).

 (a)  
If the SUPPLY DUCT temperature is high, make sure that the 35°F control valve for the right water separator is fully closed.

 (b)  
If the SUPPLY DUCT temperature is low, do these steps: 1) Make sure that the 35°F control valve for the right water

 separator is fully open. 2) Do a BITE test of the 35°F control system.

 (c)  
Remove and replace the defective component.

 S 975-142
 (11)
 Write down the position of the 35°F control valve for the right water separator.

 S 975-143

 (12)
 Make sure that the position of the 35°F control valve for each water separator is approximately the same.

 S 865-144

 (13)
 Set the R PACK switch to OFF.

 F. Put the Airplane Back to Its Usual Condition
 S 865-311
 (1)  
Shutoff the APU if it is not necessary (AMM 49-11-00/201).

 (2)  
Move the APU BLEED switch to OFF.

 (3)  
Move the ISOLATION VALVE switch to CLOSE.

 (4)  
Move the L PACK and R PACK switches to OFF.

 S 865-315

 (5)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 (6)  
Close the bay doors to the air conditioning equipment.

 S 865-312
 S 865-313
 S 865-314
 S 415-316
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 TASK 21-51-00-715-338
 9. Operational Test - Air Cycle System - APU Flow Mode Test
________________________________________________________
 A. General
 (1)  
This procedure has the steps to test the turbofan valve.

 (2)  
This procedure supplies a quick check of the system performance for scheduled maintenance checks and to troubleshoot flight operation problems.

 B. References
 (1)  
AMM 21-51-21/701, Heat Exchangers

 (2)  
AMM 21-61-00/101, Temperature Control System

 (3)  
AMM 24-22-00/201, Electrical Power

 (4)  
AMM 49-11-00/201, Auxiliary Power Unit

 C. Access
 (1)  
Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right
 210 Air Conditioning Distibution Bay
 212 Left Air Conditioning Equipment Bay
 214 Right Air Conditioning Equipment Bay

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

 D. Prepare for the Tests
 S 865-317
 (1)  
Make sure that all the circuit breakers for the air conditioning and the pneumatic systems are closed.

 S 865-318

 (2)  
Make sure that these circuit breakers are closed on the P6-3 panel:

 (a)  
MASTER CAUTION (all except FUEL, if installed)

 (b)  
INDICATOR LIGHTS, MASTER DIM BUS (9 locations)

 (c)  
DIM & TEST (1 location)
　
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