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21-51-00
ALL ú ú 01 Page 523 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
F. Put the Airplane Back to Its Usual Condition
S 865-277
(1)
Shutoff the APU if it is not necessary (AMM 49-11-00/201).
S 865-278
(2)
Move the APU BLEED switch to OFF.
S 865-279
(3)
Move the ISOLATION VALVE switch to CLOSE.
S 865-280
(4)
Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
S 415-281
(5)
Close the bay doors to the air conditioning equipment.
TASK 21-51-00-705-286
7. Operational Test - Air Cycle System - Flow and Primary Heat Exchanger Test
__________________________________________________________________________
A. General
(1)
This procedure has the steps to test the pack flow and the heat exchangers.
(2)
This procedure supplies a quick check of the system performance for scheduled maintenance checks and to troubleshoot flight operation problems.
B. References
(1)
AMM 21-51-21/701, Heat Exchangers
(2)
AMM 21-61-00/101, Temperature Control System
(3)
AMM 24-22-00/201, Electrical Power
(4)
AMM 49-11-00/201, Auxiliary Power Unit
C. Access
(1)
Location Zones
101 Control Cabin - Left
102 Control Cabin - Right
210 Air Conditioning Distibution Bay
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
D. Prepare for the Tests
S 865-287
(1) Make sure that all the circuit breakers for the air conditioning and the pneumatic systems are closed.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-51-00
ALL ú ú 01 Page 524 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 865-288
(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 865-289
(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 015-290
(4) Open the bay doors for the air conditioning equipment.
S 715-357
(5) Make sure that the AIR MIX VALVE indicators for the CONT CABIN and PASS CABIN on the P5-17 temperature control module show that the air mix valves are in the fully COLD position. (a) Make sure the AIR MIX VALVE indicator needles on the P5-17 panel align with the inner mark at the COLD position. (b) If the indicator needles are not at the full COLD position, then do this procedure: Temperature Control Trouble Shooting (AMM 21-61-00/101).
S 865-293
(6) 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. (a) If the visual indicators on the mix valves do not align with the COLD position, then do this procedure: Temperature Control Trouble Shooting (AMM 21-61-00/101).
S 865-294
(7) 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) Move the L PACK and the R PACK switches to OFF.
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