(2)
System Performance Test - Equipment Cooling System
B. The operational test of the equipment cooling system will make sure that the system components operate correctly. The system performance test of the equipment cooling system will make sure that there is sufficient airflow to cool all the equipment on the electronic racks.
TASK 21-58-03-705-001
2. Operational Test - Equipment Cooling System___________________________________________
A. General
(1)
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.
(2)
To cool the equipment on the electronic racks correctly, a balanced airflow must be supplied through the fixed orifice plates on each shelf. If equipment is not installed on the racks, the orifices in these empty trays are covered with a metering plate or tape. The metering plates or tape must be removed before you install additional equipment to prevent the equipment from overheating.
CAUTION: DO NOT ADD EQUIPMENT OR CHANGE THE ORIFICE OPENING ADJUSTMENTS
_______ WITHOUT YOUR ENGINEERING DEPARTMENT APPROVAL. THE EQUIPMENT ON THE RACKS CAN OVERHEAT IF THE ORIFICE OPENINGS ARE NOT ADJUSTED CORRECTLY.
(3) The electronic racks have space for additional equipment if it is necessary. When you add more equipment to the rack, the airflow through the orifices could change for the remaining equipment which can cause the equipment to overheat. Before you add more equipment to the racks, make sure your engineering department approves. You must make sure that the orifices are adjusted correctly to supply sufficient airflow to cool all the equipment. Fig. 501 shows the location of equipment cooling racks.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B.
C.
D.
A
737-300/400/500MAINTENANCE MANUAL
(4)
The operational test makes sure that all the equipment cooling
system components work.References
(1)
AMM 24-22-00/201, Electrical PowerAccess
(1)
Location Zone 101 Control Cabin - Left 102 Control Cabin - Right 205 Electronic Compartment
Procedure
S 865-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 215-003
(2)
Make sure these circuit breakers on the P18 panel are closed:
(a)
EXH FAN CONTROL
(b)
NORMAL EXHAUST FAN POWER
(c)
ALTERNATE EXHAUST FAN POWER
S 865-004
(3)
Move the EQUIP COOLING EXHAUST selector switch to NORMAL, on the P5 panel.
S 715-005
(4)
Make sure that the normal blower operates.
S 215-006
(5)
Make sure that the flow control valve is open.
S 215-007
(6)
Make sure the EQUIP COOLING EXHAUST OFF light, on the P5 panel, is off.
S 215-008
(7)
Make sure the MASTER CAUTION and OVERHEAD lights, on the P7 panel, are off.
(8)
Move the EQUIP COOLING EXHAUST selector switch to ALTERNATE.
(9)
Make sure the alternate blower operates.
(10)
Make sure the flow control valve stays open.
S 215-012
(11)
Make sure the EQUIP COOLING EXHAUST OFF light, MASTER CAUTION and OVERHEAD lights stay off.
S 865-009
S 715-010
S 215-011
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21-58-03 中國航空網 m.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：737-300 400 500 AMM 飛機維護手冊 空調 AIR CONDITIONING 2(98)
