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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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