Air Cycle System Component Location Figure 501 (Sheet 1)
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A

737-300/400/500
MAINTENANCE MANUAL

OVERHEAD DISTRIBUTION MANIFOLD  MAIN DISTRIBUTION MANIFOLD  CABIN TO CONTROL 
SEE  E  SEE  D 

250`F DUCT OVERHEAT SWITCH
FWD
MAIN DISTRIBUTION MANIFOLD
D
250`F OVERHEAT SWITCH
CLAMP  ELECTRICAL CONNECTOR
FWD
CLAMP TURBOFAN OVERHEAD DISTRIBUTION MANIFOLD VALVE
E
FWD  MANUAL 
CONTROL 
BONDING  ROD 
JUMPER 
INBD  ELECTRICAL 
CONNECTOR 
TURBOFAN VALVE 
F 

Air Cycle System Component Location
Figure 501 (Sheet 2)

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 C.
D.
E.

A
737-300/400/500MAINTENANCE MANUAL
References
 (1)  
AMM 24-22-00/201, Electrical Power

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

 (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

Prepare for the Test
 S 865-333
 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 015-269

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

 S 865-270

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

 S 865-271

 (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)

 (d)  
NOSE GEAR AIR/GND

 (e)  
LANDING GEAR AIR/GND RELAY & LTS

 S 865-272
 (5)  
Make sure that the L PACK and R PACK switches are at OFF, on the P5-10 panel.

 S 865-273

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

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737-300/400/500MAINTENANCE MANUAL
 S 865-274
 (7)  
Move the APU BLEED switch to OFF, on the P5-10 panel.

 S 865-275

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

 F. Procedure
 S 215-173
 (1)  
Make sure that the L PACK and R PACK switches are at OFF.

 S 715-052

 (2)  
Do this test of the 390°F ACM Compressor Discharge switches, S2 and S5:

 (a)  Disconnect the electrical connectors, D532 and D538, from the left and right switches, S2 and S5, respectively.
 CAUTION: USE TWO WRENCHES TO REMOVE THE SWITCH FROM THE BOSS ON THE
　
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