*
Overpressure protection
*
OFF control through the engine fire switch
*
OFF control through the duct leak detection system
*
OFF control for the engine start condition.
EFFECTIVITY BEJ ALL 36-11-00
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D633W101-BEJ Sep 05/2002
ENGINE AIR SUPPLY SYSTEM -AIR SUPPLY CABIN PRESSURE CONTROLLER -PURPOSE
EFFECTIVITY BEJ ALL 36-11-00
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D633W101-BEJ Jan 05/2002
ENGINE AIR SUPPLY SYSTEM -ASCPC -POWER AND ARINC 629 INPUTS
Power Inputs
The left ASCPC gets 28v dc power from section two of the battery bus. The right ASCPC gets 28v dc power from the captain’s flight instrument bus and the first officer’s flight instrument bus.
The digital (primary) mode circuits get power through the AIR SPLY L(R) PRI and SEC circuit breakers.
The digital mode gets power through the AIR SPLY L(R) SOL circuit breakers to operate solenoids such as the solenoids in the isolation valves and the APU shutoff valve (not shown).
The analog (backup) mode circuits get power through the AIR SPLY L(R) BACKUP circuit breaker.
Airplane Systems ARINC 629 Inputs
The ASCPCs receives inputs through the left and right ARINC 629 system buses.
Anti-ice air flow rates for the wings and engines are from the airfoil and cowl ice protection system (ACIPS).
Vertical navigation active yes/no information is from the autopilot flight director computer (AFDC).
These inputs are from the air data inertial reference unit (ADIRU):
*
Total air temperature
*
Airplane pressure altitude
*
Airplane static pressure
*
Ground speed.
Inputs from the ADIRU come through the AIMS from the flight control buses.
The airplane information management system (AIMS) gives inputs from the central maintenance computing system (CMCS), the primary display system (PDS), and the flight management computing system (FMCS).
CMCS gives these inputs:
*
Flight phase
*
Flight leg
*
Date/Time
*
Airplane registration number
*
CMCS master for the source of CMCF data YES/NO
*
Data load
*
Equipment ID number
*
Start built in test
*
Stop built in test
*
Show fault history.
PDS gives these inputs:
EFFECTIVITY BEJ ALL 36-11-00
Page 46
D633W101-BEJ Sep 05/2002
ENGINE AIR SUPPLY SYSTEM -ASCPC -POWER AND ARINC 629 INPUTS
*
Pressure altitude of the selected landing field
*
Pressure altitude of the actual landing field
*
Left/right engine on status
*
Barometric correction
*
Left/right engine simulated on status.
FMCS gives these inputs:
*
Engine manufacture
*
Planned cruise altitude
*
Time remaining for climb
*
Time remaining for descent
*
ETA for start top of descent
*
FMC master for the source of CMCF data YES/NO.
TMCF gives these inputs:
* APT has been commanded.
These inputs are between the left and right ASCPCs:
*
Cabin Pressure Control (CPC) mode status, active/standby/ fail
*
Current operational CPC flight mode
*
CPC data to flight compartment
*
CPC channel configuration for the number of outflow valves that can be controlled
*
Left and right ARINC 629 bus activity check
*
CPC doing an initiated BIT
*
Fwd/aft outflow valve (OFV) set to auto/manual
*
Sensed cabin pressure
*
Manifold duct pressure
*
Manifold flow rate
EFFECTIVITY
BEJ ALL
*
Engine bleed air control (digital) failed
*
PRSOV position
*
APUSOV, left/center/right isolation valve solenoid current
*
APUSOV, Left/center/right isolation valve RVDT voltage
*
APUSOV, left/center/right isolation valve control failed to off or to on
*
ASCPC software version number.
APU on/off, APU bleed air start and APU mode of operation (cool down, pneumatic) information is from the auxiliary power unit controller (APUC).
These inputs are from the cabin temperature controllers (CTC):
*
Left and right pack inlet pressure
*
Left and right pack set air flow rates
*
Left and right pack mass air flow rates
*
Request for an increase in engine manifold air pressure (6 psig)
*
Request for a decrease in precooler out temperature (250F, 121C)
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