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 D.  The operational tests of the air cycle system do checks of the system during normal system operations. To do these tests, you must supply electrical power and pneumatic pressure before you can operate the cooling packs.
 E.  This procedure uses heating equipment to do a check of the components for the air cycle system. Refer to 20-10-27/201, Heat Guns, Soldering Guns, Soldering Irons, for the use of the heating equipment before you do this procedure.
 TASK 21-51-00-705-001
 2.  System Test - Air Cycle System - Pack Flow Control and Shutoff Valve Test_________________________________________________________________________
 A.  General
 (1)  This task has the steps to do a test of the pack flow control and shutoff valve.
 B.  Special Tools and Equipment
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (1)  
Jumper wire

 (2)  
Voltmeter, Analog

 C. References
 (1)  
AMM 24-22-00/201, Electrical Power

 (2)  
AMM 27-51-00/001, Trailing Edge Flap System

 (3)  
AMM 49-11-00/201, APU Power Plant

 D. Access
 (1)  
Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right
 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

 

 E. Prepare for the Test
 S 865-180
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LEADING
_______ EDGE SLATS. THE LEADING EDGE SLATS CAN MOVE QUICKLY WHEN THE HYDRAULIC SYSTEMS ARE PRESSURIZED, THE TRAILING EDGE FLAPS ARE AT POSITION 1,2 OR 5, AND WHEN THE AIR/GROUND RELAYS FOR THE NOSE/MAIN LANDING GEAR DETECT AN AIR MODE CONDITION. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 015-174

 (2)  
Open the bay doors to the air conditioning equipment.

 S 215-003

 (3)  
Make sure that all the circuit breakers for the air conditioning system are closed.

 S 215-004

 (4)  
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (d)  
NOSE GEAR AIR/GND

 (e)  
LANDING GEAR AIR/GND RELAY & LTS

 S 215-005
 (5)  
Make sure that the L PACK and R PACK switches are at OFF, on the P5-10 panel.

 S 865-006

 (6)  
Lower the wing flaps to the FLAPS 1 position or more
 (AMM 27-51-00/001).

 S 865-007

 (7)  
Move the APU BLEED switch to OFF, on the P5-10 panel.

 S 865-008

 (8)  
Move the engine BLEED 1 and engine BLEED 2 switches to ON, on the P5-10 panel.

 F. Pack Flow Control and Shutoff Valve Test
 S 035-010
 (1) Disconnect these electrical connectors from the pack valve:
 Left Pack Valve_______________  Right Pack Valve
 D392 APU High Flow Mode  D394 APU High Flow Mode
 D962 Low Flow Mode  D964 Low Flow Mode
 D488 Main ON/OFF  D492 Main ON/OFF
 S 765-011
 (2)  Use a voltmeter to make sure these voltages occur at these electrical connectors:
 NOTE: The L PACK and R PACK switches are at OFF.
____
 Left Pack Valve_______________  Right Pack Valve
　
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