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SATCOM check valve
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Ducts and hoses.
The system has interfaces with the lavatory/galley ventilation system. The ventilation system pulls cabin air though the equipment to cool it.
The lavatory/galley ventilation fans are part of the air conditioning system. One fan operates at a time.
See the ventilation system for more information about the lavatory/galley vent fans (SECTION 21-26).
The SATCOM fan comes on if both lavatory/galley ventilation fans do not operate. It pulls cabin air through the SATCOM equipment on the E11 rack.
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A/C -EQUIPMENT COOLING -AFT SYSTEM -GENERAL DESCRIPTION -MECHANICAL
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A/C -EQUIPMENT COOLING -PASSENGER COMPARTMENT COMPONENT LOCATIONS
Component Locations
These components are above the passenger compartment ceiling:
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Satellite communications (SATCOM) backup cooling fan
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SATCOM backup cooling check valve.
The SATCOM backup cooling fan attaches to the bottom aft side of the E11 rack. The rack is near door 3 left, above the passenger compartment ceiling.
The SATCOM backup cooling check valve is in the vent duct that connects the rack to the lavatory/galley ventilation system. The duct is on the forward end of the equipment rack.
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A/C -EQUIPMENT COOLING -PASSENGER COMPARTMENT COMPONENT LOCATIONS
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A/C -EQUIPMENT COOLING -SATCOM BACKUP COOLING FAN AND CHECK VALVE
Purpose
The SATCOM backup cooling fan pulls air through the E11 rack if the lavatory/galley ventilation system does not operate.
The SATCOM backup cooling check valve makes sure that the fan pulls air through the SATCOM equipment on the rack and not out of the duct to the lavatory/galley ventilation system.
Location
The SATCOM fan and check valve are above the passenger compartment ceiling.
The SATCOM backup cooling fan attaches to the bottom aft side of the E11 rack. The E11 rack is near door 3 left.
The SATCOM backup cooling check valve is in the vent duct that connects the rack to the lavatory/galley ventilation system. The duct is on the opposite end of the equipment rack as the fan.
Physical Description
The SATCOM backup cooling fan has these components:
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Fan assembly (not shown)
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Housing
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Check valve
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Electrical connector.
The SATCOM backup cooling check valve has a valve body and a set of flapper doors (not shown).
Training Information Point
The check valve has a small inlet and a larger outlet and has an air flow direction arrow on it to help install the valve correctly.
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A/C -EQUIPMENT COOLING -FUNCTIONAL DESCRIPTION -SATCOM BACKUP COOLING FAN
General
The SATCOM backup cooling fan gives backup pull-through cooling to the SATCOM equipment. The right ECSMC gives primary control when the airplane gets power and the left ECSMC gives backup control. When the airplane changes from air to ground, the card in control changes.
Fan Control
The ECSMCs control the fan through the EEU in the P110 left power management panel. The cards use the ARINC 629 buses to send the FAN ON CMD signal to the EEU.
The ECSMC in control sends the FAN ON CMD signal if both lavatory/galley ventilation fans are off for more than 10 seconds.
Fan operation also occurs during ground test. See the section on equipment cooling ground test for more information on ground tests.
Fault Indication
Status messages show when a SATCOM backup fan or the circuit that controls it has a malfunction.
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A/C -EQUIPMENT COOLING -FWD SYS -GENERAL DESCRIPTION -MECHANICAL
General 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 空调 Air Conditioning(19)
