*
Left isolation valve solenoid
*
Center isolation valve solenoid
*
Right isolation valve solenoid
*
Left air conditioning upper flow control valves torque motor
*
Left trim air pressure regulating and shutoff control valve shutoff solenoid.
These are the devices that get discrete outputs from the digital part of the right ASCPC:
*
APUSOV solenoid
*
Left isolation valve solenoid
*
Center isolation valve solenoid
*
Right isolation valve solenoid
*
Right air conditioning upper flow control valves torque motor
*
Right trim air pressure regulating and shutoff control valve shutoff solenoid.
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ENGINE AIR SUPPLY SYSTEM -ASCPC -DISCRETE AND ANALOG INPUTS/OUTPUTS
The discrete outputs from the analog part of the left and right ASCPCs are for the OFF light in the engine bleed air switches and the advisory EICAS message that agrees with the OFF light.
Analog Inputs
The left and right ASCPC receives inputs from system sensors and RVDTs. The digital and analog parts of each controller get inputs from different sensors.
These are the analog inputs to the digital part of the left ASCPC:
*
Temperature of the left pneumatic distribution duct air is from element number two of the left manifold dual temperature sensor
*
Temperature of the compressor discharge air in the left air conditioning pack is from the left pack ASCPC compressor discharge temperature sensor
*
Temperature of the left pack discharge air is from the left pack ASCPC discharge temperature sensor
*
Differential pressure data at the left air conditioning pack inlet is from the ASCPC differential pressure sensor that is part of the left flow sensor
*
Pressure of the left pneumatic distribution duct air is from the left manifold pressure sensor
*
Air flow of the left pneumatic distribution duct air is from the left manifold flow sensor
*
Valve position of the left and center isolation valves and the left fan air modulating valve. Position data is from RVDTs in each valve.
EFFECTIVITY
BEJ ALL
The digital part of the right ASCPC has the same analog inputs as the left ASCPC except the inputs are from right system sensors and valve position are from these valves:
*
Right isolation valve
*
APUSOV
*
Right fan air modulating valve.
These are the analog inputs to the analog part of the left ASCPC:
*
Temperature of the left pneumatic distribution duct air is from element number one of the left manifold dual temperature sensor
*
Pressure of the left engine HP/IP manifold air is from the left intermediate pressure sensor.
The analog part of the right ASCPC has the same analog inputs as the left ASCPC except the inputs are from the right system sensors.
Analog outputs
The left and right ASCPCs control current to torque motors in different valve controllers and to heater elements in different flow sensors.
These are the analog outputs from the digital part of the left ASCPC:
* Left fan air modulating valve torque motor in the HPFAC
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ENGINE AIR SUPPLY SYSTEM -ASCPC -DISCRETE AND ANALOG INPUTS/OUTPUTS
*
Left high pressure shutoff valve torque motor in the HPFAC
*
Left pressure regulating and shutoff valve torque motor in the PRSOVC
*
Left manifold flow sensor heater element
*
Left air conditioning pack lower flow control valve torque motor.
The analog part of the left ASCPC outputs to the torque motor of the left pressure regulating and shutoff valve.
The right ASCPC has the same analog outputs as the left ASCPC except the outputs are to right system components.
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ENGINE AIR SUPPLY SYSTEM -ASCPC -DISCRETE AND ANALOG INPUTS/OUTPUTS
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D633W101-BEJ Jan 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
THIS PAGE IS INTENTIONALLY LEFT BLANK
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Page 56 D633W101-BEJ Jan 05/2002
ENGINE AIR SUPPLY SYSTEM -FUNCTIONAL DESCRIPTION -1
General
The left air supply cabin pressure controller (ASCPC) controls the left engine air supply system. The right ASCPC controls the right engine air supply system.
The engine air supply system has three modes:
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本文鏈接地址：777 AMM 飛機維護手冊 氣源 Pneumatic(15)
