APU ~EGT `C

80
-40-30-20-10 0 10 20 30 40 50
AMBIENT TEMPERATURE `C
NOTE:  THESE LIMITS ARE FOR SEA LEVEL STATIC OPERATION. FOR HIGHER ELEVATIONS, RAISE EACH LINE BY 5`C PER 1,000 FEET.
Changes in APU EGT (With One A/C Pack Flow) per Changes in Ambient Temperature Figure 502 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH GARRETT APU MODELS ú

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 GTCP85-129H,-129J,-129K  ú ú 01 Page 537 ú Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (2)  Access Panels
 3303L A/C Access Panel
 3403R A/C Access Panel

 D. Prepare for the Tests
 S 865-299
 (1)  
Make sure that all the circuit breakers for the air conditioning and the pneumatic systems are closed.

 S 865-300

 (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)

 (d)  
NOSE GEAR AIR/GND

 (e)  
LANDING GEAR AIR/GND RELAY & LTS

 S 865-301
 (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

 S 015-302
 (4)  
Open the bay doors for the air conditioning equipment.

 S 865-303

 (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 865-304
 (6)  
Move the CONT CABIN and PASS CABIN temperature selectors to MANUAL OFF.

 S 865-305

 (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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 538 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-306
 (8)  Set the positions of these switches on the P5-10 panel:
 (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 865-307
 (9)  Start the APU (AMM 49-11-00/201).
 NOTE: The electrical load is to be less than 25 amperes.
____
 S 865-308
 (10)
 Move the L PACK and R PACK switches to OFF, on the P5-10 panel.

 S 865-309

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

 S 865-310

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

 E. Procedure
 S 215-251
 (1)  
Make sure the right pack switch is OFF.

 S 865-252

 (2)
Make sure the left pack temperature selector is set to FULL COLD.

 S 865-134

 (3)  
Move the L PACK switch to HIGH.

 S 975-135

 (4)  
When the SUPPLY DUCT temperature is stable, write down the SUPPLY DUCT temperature.

 S 975-136

 (5)  
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 left 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 left water
　
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