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A
737-300/400/500MAINTENANCE MANUAL
 S 865-003
 (2)  Make sure these circuit breakers are closed:
 (a)  
P6-4 Load Control Circuit Breaker Panel
 1) TEMP CONTROL AUTOMATIC R
 2) TEMP CONTROL AUTOMATIC L
 3) TEMP CONTROL MANUAL
 4) AIR CONDITIONING TURBOFAN L VALVES
 5) AIR CONDITIONING TURBOFAN R VALVES
 6) AIR CONDITIONING FWD OUTFLOW VALVES
 7) AIR CONDITIONING OVERHEAT
 8) AIR CONDITIONING RAM MOD R
 9) AIR CONDITIONING RAM MOD L
 10) AIR CONDITIONING RAM MOD CONT
 11) AIR CONDITIONING RECIRC FAN CONT
 12) AIR CONDITIONING RECIRC FAN ENERGIZED
 13) AIR CONDITIONING BLEED AIR VALVES L
 14) AIR CONDITIONING BLEED VALVES R
 15) PRESSURIZATION CONTROL AUTOMATIC AC
 16) PRESSURIZATION CONTROL AUTOMATIC DC
 17) PRESSURIZATION CONTROL STBY AC
 18) PRESSURIZATION CONTROL STBY DC
 19) PRESSURIZATION CONTROL MAN AC
 20) PRESSURIZATION CONTROL MAN DC

 (b)  
P6-3 Load Control Circuit Breaker Panel
 1) CONTROL CABIN LIGHTING DIM & TEST
 2) CONTROL CABIN LIGHTING SECT 1
 3) MASTER CAUTION AIR COND
 4) MASTER CAUTION ANNUNCIATOR BAT
 5) MASTER CAUTION ANNUNCIATOR NO. 1

 

 S 865-004
 (3)  Set these switches on the P5-10 Air-Conditioning Module (P5-10 Panel) to these positions:
 (a)  
L PACK - OFF

 (b)  
R PACK - OFF

 (c)  
BLEED 1 - OFF

 (d)  
BLEED 2 - OFF

 (e)  
ISOLATION VALVE - OPEN

 (f)  
RECIRC FAN - AUTO

 S 865-005
 (4)  Set all of the CABIN TEMPERATURE SELECTORS on the P5-17 Temperature Control Module (P5-17 Panel) to the OFF position.
 D. Do a Test of the Relays in the Air Conditioning Accessory Unit
 S 715-006
 (1)  Do a test of the Ram Air System relays:
 (a)  
Make sure the AIR/GND logic shows GND.

 (b)  
Open these access panels: 1) 3303 - Left Air-Conditioning Access Panel

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A
737-300/400/500MAINTENANCE MANUAL
 2)  3403 - Right Air-Conditioning Access Panel
 (c)  
Remove these electrical connectors: 1) D486 - (V18) Left Pack Flow Control and Shutoff Valve (L Pack Valve)

 2)  D490 - (V19) Right Pack Flow Control and Shutoff Valve (R PACK VALVE).

 (d)  
Set the flaps to the FLAPS POS 1 position.

 (e)  
Examine these items:
 1) Make sure the two Ram Air Systems are set at the

 ground-full-open position (Deflector Doors Extended). 2) Make sure the two RAM DOOR FULL OPEN lights are ON.

 (f)  
Open this access panel:
 1) 1103 - Forward Access Door

 (g)  
Push in and hold the AIR SENSING TEST SWITCH on the E11 Landing Gear Logic Shelf.

 NOTE: You must push in and hold the AIR SENSING SWITCH
____ until instructed to release the AIR SENSING SWITCH.
 (h)  
Examine these items:
 1) Make sure the two Ram Air Systems go to the

 flight-full-open position (Deflector Doors Retracted). 2) Make sure the two RAM DOOR FULL OPEN lights stay ON.

 (i)  
Set the flaps to the FLAPS UP position. 1) Make sure the two RAM DOOR FULL OPEN lights go OFF.

 (j)  
Set the flaps to the FLAPS POS 1 position.

 (k)  
Examine these items:
 1) Make sure the two Ram Air Systems go to the

 flight-full-open position (Deflector Doors Retracted). 2) Make sure the two RAM DOOR FULL OPEN lights come ON.

 (l)  
Release the AIR SENSING TEST switch on the E11 landing Gear Logic Shelf.

 (m)  
Set the flaps to the FLAPS UP position.

 (n)  
Examine these items:
 1) Make sure the two Ram Air Systems go to the

 

 ground-full-open position (Deflector Doors Extended). 2) Make sure the two RAM DOOR FULL OPEN lights are on.
 S 715-007
 (2)  Do a test of the control cabin mix valve relays:
　
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