*
Engine anti-ice (EAI)
*
Air supply distribution, flow sensor (FS).
The primary mode calculates the total amount of engine bleed air used based on the inputs. If the flow is more than 10 lbs/sec
(4.5 kg/sec), the primary mode commands the PRSOV towards closed to limit bleed air flow.
See the wing anti-ice section for more information about WAI (SECTION 30-11).
See the engine anti-ice section for more information about EAI (SECTION 30-21).
See the indicating system section for more information about the flow sensor (FS) (SECTION 36-20).
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ENGINE AIR SUPPLY SYSTEM -FUNCTIONAL DESCRIPTION -3
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During the ground test or the preflight test, the FAMV will be closed and open to do a test of the valve and its related circuit.
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AIR SUPPLY DISTRIBUTION -INTRODUCTION
Purpose
The air supply distribution system supplies air from the air sources to users. The system also isolates the air sources from each other.
General
The air supply distribution system supplies compressed air from the engines, APU, and ground carts to user systems. The left and right air supply cabin pressure controllers (ASCPCs) control three isolation valves and the APUSOV in the distribution system. Both controllers control the valves at the same time. The valves then supply air to these components and systems:
*
Engine start valve
*
APU start valve
*
Wing anti-ice
*
Hydraulic reservoirs
*
Air conditioning packs
*
Aft and bulk cargo heat
*
Trim air
*
Total air temperature probe
*
Air driven hydraulic pumps
*
Potable water.
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AIR SUPPLY DISTRIBUTION -GENERAL DESCRIPTION
General
The air supply distribution system has these parts:
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Large main distribution ducts (wing, body)
*
Small ducts
*
Left isolation valve
*
Center isolation valve
*
Right isolation valve
*
APU shutoff valve (APUSOV)
*
Three high pressure ground connectors.
The large main distribution ducts connect to the engines and the APU. The smaller ducts connect the user systems to the main distribution ducts.
You use switches on the bleed air/pressurization panel to set the mode of control for the isolation valves and APUSOV. AUTO and CLOSED are the positions for the isolation valve switches. AUTO and OFF are the positions for the APUSOV switch. The switches also have annunicator lights that give you information about the system.
The left and right ASCPCs control the isolation valves and the APUSOV. The controllers use inputs from these systems/ components to calculate when a valve should be open or closed:
*
ELMS
*
OPAS
*
AIMS
EFFECTIVITY
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APU fire switch
*
DLODS
*
APUC
*
ADIRU.
The ELMS tells the ASCPCs when the airplane is on standby power. The ASCPCs use this when calculating APUSOV position.
The OPAS is the interface between the ARINC 629 buses and the bleed air/pressurization panel. The ASCPCs get information about switch position and control the annunicator lights through the OPAS and the ARINC 629 buses. The ASCPCs use switch position when calculating valve positions.
The AIMS gives information about the system through the primary display system.
The APU fire switch gives switch position information directly to the ASCPCs. The ASCPCs use this when calculating valve positions.
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