(d)  
NOSE GEAR AIR/GND

 (e)  
LANDING GEAR AIR/GND RELAY & LTS

 S 865-319
 (3)  
Put the LIGHTS switch to TEST momentarily, on the P2-1 panel, and make sure that these lights come on and then go off:

 (a)  
MASTER CAUTION and AIR COND annunciator lights on the P7 panel

 (b)  
PACK TRIP OFF lights on the P5-10 panel

 (4)  
Open the bay doors for the air conditioning equipment.

 S 015-320
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737-300/400/500MAINTENANCE MANUAL
 S 865-321
 (5)  Operate the CONT CABIN and PASS CABIN temperature selectors, on the P5-17 panel, to put the air mix valves in the full COLD position.
 NOTE: The indicator needle of each AIR MIX VALVE indicator, on
____ the P5-17 panel, must align with the inner mark at the COLD position.
 S 865-322
 (6)  
Move the CONT CABIN and PASS CABIN temperature selectors to MANUAL OFF.

 S 865-323

 (7)  
Make sure that the indicator needle of the visual indicator on each air mix valve, in the air conditioning bay, is at the full COLD position.

 NOTE: Refer to 21-61-00/101, Temperature Control System, if the
____ indicator needles are not at the full COLD position.
 S 865-324
 (8)  Set the positions of these switches, on the P5-10 panel, as follows:
 (a)  
Put the engine BLEED 1 switch to OFF.

 (b)  
Put the engine BLEED 2 switch to ON.

 (c)  
Put the APU BLEED switch to ON.

 S 865-325
 (9)  Start the APU (AMM 49-11-00/201).
 NOTE: The electrical load is to be less than 25 amperes.
____
 S 865-326
 (10)
 Move the L PACK and R PACK switches to OFF, on the P5-10 panel.

 (11)
 Move the ISOLATION VALVE switch to OPEN, on the P5-10 panel.

 S 865-328

 (12)
 Move the RECIRC FAN switch to OFF, on the P5-10 panel.

 S 865-327
 E. Procedure
 S 865-145
 (1)  Set the L PACK switch to HIGH.
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 S 035-146
 (2)  Disconnect the solenoid A electrical connector, D392 (APU high flow
 mode), from the left pack flow control and shutoff valve.
 S 215-232
 (3)  Make sure that the flow control and shutoff valve for the left pack
 moves towards the closed position.
 S 215-147
 (4)  Make sure that the APU EGT decreases.
 NOTE:____ If the APU EGT does not decrease, there is a problem with
 the wiring.

 S 435-148
 (5)  
Connect the solenoid A electrical connector, D392, to the left pack flow control and shutoff valve.

 S 215-233

 (6)  
Make sure that the flow control and shutoff valve for the left pack moves towards the open position.

 S 215-149

 (7)  
Make sure that the APU EGT increases.

 NOTE: If the APU EGT does not increase, there is a problem with
____ the wiring.
 S 865-150
 (8)  
Set the L PACK switch to OFF.

 S 865-151

 (9)  
Set the R PACK switch to HIGH.

 S 035-152

 (10)
 Disconnect the solenoid A electrical connector, D394 (APU high flow mode), from the right pack flow control and shutoff valve.

 S 215-234

 (11)
 Make sure that the flow control and shutoff valve for the right pack moves towards the closed position.

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