Equipment Cooling Rack Location
Figure 501
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A
737-300/400/500MAINTENANCE MANUAL
S 865-013
(12)
Move the EQUIP COOLING EXHAUST switch to NORMAL.
S 715-014
(13)
Make sure the normal blower operates.
S 215-017
(14)
Make sure the EQUIP COOLING EXHAUST OFF light, MASTER CAUTION and OVERHEAD lights stay off.
S 865-015
(15)
Open this circuit breaker on the P18 panel and attach a DO-NOT-CLOSE tag:
(a) NORMAL EXHAUST FAN POWER
S 715-018
(16)
Make sure the normal blower does not operate.
S 215-019
(17)
Make sure the EQUIP COOLING EXHAUST OFF light, MASTER CAUTION and OVERHEAD lights come on within 10 minutes.
S 215-020
(18)
Make sure the EQUIP COOLING SUPPLY OFF light, on the P5 panel, does not come on.
S 865-016
(19)
Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P18 panel:
(a) NORMAL EXHAUST FAN POWER
(20)
Make sure the normal blower operates.
S 215-023
(21)
Make sure the EQUIP COOLING EXHAUST OFF light goes off within 5 minutes.
S 715-022
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737-300/400/500MAINTENANCE MANUAL
S 865-067
(22)
Press the MASTER CAUTION light on the P7 lightshield.
S 715-068
(23)
Make sure the MASTER CAUTION and OVERHEAD lights on the P7 lightshield go off.
S 865-043
(24)
Remove the electrical power if it is not necessary
(AMM 24-22-00/201).
TASK 21-58-03-705-024
3. System Performance Test - Equipment Cooling System__________________________________________________
A. General
(1)
To do a performance check of the equipment cooling system, it is necessary to measure system pressures in a number of locations. You must correct the pressure readings for ambient temperature and pressure, and compare the corrected pressures to a minimum acceptable pressure reading.
(2)
Fig. 502 shows the locations of the test ports which have an aluminum foil marker. Fig. 503 has instructions for the use of the test equipment to measure the pressures. Fig. 504 shows the graphs to correct the gage pressure readings for the ambient pressure and temperature. Fig. 505 shows the list of the minimum acceptable pressures for the normal operation of the system. Fig. 505 shows one table how the test data can be assembled and evaluted. The pressure which you will measure and the minimum acceptable pressures in Fig. 505 are actually negative with respect to the field pressure. However, the pressures are shown as positive for easier data collection.
(3)
For those maintenance activities which require main electrical power on for more than 20 minutes when the outside ambient temperature is more than 100°F (37.8°C), it is recommended to supply conditioned air to the cabin (AMM 21-00-00/201). This will improve the thermal environment for the electrical equipment.
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A 737-300/400/500MAINTENANCE MANUAL
TEST
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