A/C -EQUIPMENT COOLING -DUCT PRESSURE SENSORS
Purpose
Four duct pressure sensors tell the ECSMCs the pressure at each sensor location.
Physical Description
Each duct pressure sensor has these components:
*
Sense port
*
Electrical connector
*
Sensor housing.
Location
These are the four duct pressure sensor locations.
The sensor for the E5 rack is aft and below the E5 rack. Access is through the forward cargo compartment right sidewall panel, aft of the cargo door.
The duct pressure sensor for the backup generator converter (E4-4 shelf) is to the right side and below the E4 rack.
The duct pressure sensor for the E4-1, E4-2 and E4-3 shelves is just forward of the MEC access door, below the main battery.
The duct pressure sensor for the flight deck is in the forward equipment center. It is directly forward of the cutout for the forward access door
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A/C -EQUIPMENT COOLING -DUCT PRESSURE SENSORS
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A/C -EQUIPMENT COOLING -LOW FLOW SENSORS
Purpose
The two low flow sensors tell the ECSMCs if there is low air flow or high air temperature in the equipment cooling air.
Physical Description
The low flow sensor has these components:
*
Probe
*
Body
*
Electrical connector.
Location
The flight deck low flow sensor is in the MEC. The sensor is below and outboard of the forward corner of the P300 auxiliary power panel.
The MEC low flow sensor is in the forward cargo compartment below the floor. The sensor is inboard of the forward right powered drive unit.
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A/C -EQUIPMENT COOLING -LOW FLOW SENSORS
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A/C -EQUIPMENT COOLING -CONVERTER SUPPLEMENTAL COOLING CHECK VALVE (VSCF)
Purpose
The converter supplemental cooling check valve makes sure the air from the converter supplemental cooling fan goes to E4-4 shelf and does not go into the equipment cooling supply duct.
Physical Description
The check valve is a flapper-type valve. The valve is spring-loaded to the closed position.
Location
The check valve is on the right side of the MEC behind the P210 panel. The valve is in the supply duct that gives air to the E4-4 shelf.
Training Information Point
The check valve has an air flow direction arrow on the valve to help you install the valve correctly.
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A/C -EQUIPMENT COOLING -CONVERTER SUPPLEMENTAL COOLING CHECK VALVE (VSCF)
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A/C -EQUIPMENT COOLING -VENT FAN
Purpose
The vent fan pulls air from the vent part of the forward equipment cooling system to give cooling. It sends the air to the forward cargo heat valve and the vent valve.
Physical Description
The vent fan has these components:
*
Stator housing assembly
*
Check valve (not shown)
*
Electrical connector
*
Electric motor (not shown)
*
Inlet housing assembly.
Location
The vent fan is in the forward cargo compartment forward of the P35 and the E16 rack in the right sidewall area.
Training Information Point
Remove the sidewall panel to get access to the vent fan.
The vent fan has an air flow direction arrow on the fan to help you install the fan correctly.
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A/C -EQUIPMENT COOLING -VENT FAN
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A/C -EQUIPMENT COOLING -VENT VALVE AND FORWARD CARGO HEAT VALVE
Purpose Training Information Point
The vent valve lets equipment cooling vent (exhaust) air go to Install the valves with the manual override knob up. This the area near the forward pressurization outflow valve. permits better access to the manual override knob.
The forward cargo heat valve lets equipment cooling vent The valves are interchangeable. (exhaust) air flow to the forward cargo compartment.
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