*
Backup (Analog)
*
Pneumatic.
The ASCPC gives the primary and the backup modes of operation. The pneumatic mode is controlled by the reference pressure regulators in the HPFAC and the PRSOVC.
For usual operation, all of the functions of the primary mode operate and some of the functions of the backup mode operate at the same time.
If the primary mode does not operate, all of the functions for the backup and pneumatic modes operate at the same time.
If the primary and backup modes do not operate, the pneumatic mode controls the engine air supply without input from the flight deck or the ASCPC.
EFFECTIVITY
BEJ ALL
Primary Mode
The primary mode gives complete control and indications for the engine air supply system.
The operation monitor function in the ASCPC enables the primary mode if it finds no software or power supply faults related to the primary mode.
The primary mode uses the HPFAC and the PRSOVC to do these functions:
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On/off control
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Bleed source selection
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Pressure regulation
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Overpressure protection
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Temperature regulation
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Temperature limiting
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Overtemperature protection
*
Flow limiting.
The primary mode gives power to these items:
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HPFAC
*
FAMV RVDT
*
PRSOVC
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Manifold flow sensor
*
Manifold pressure sensor
*
Manifold dual temperature sensor (TM 2)
The primary mode gets information directly from these sources:
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ENGINE AIR SUPPLY SYSTEM -FUNCTIONAL DESCRIPTION -1
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FAMV RVDT
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Manifold flow sensor
*
Manifold pressure sensor
*
Manifold dual temperature sensor (TM 2)
*
Backup mode (IP data)
*
AIMS
*
DLODS
*
Engine bleed air switch
*
Engine fire switch
*
Backup mode.
Information comes to the primary mode on the left and right ARINC 629 systems buses. These are the data sources and uses of this information in the primary mode:
*
ACIPS -engine and wing anti-ice air flow rates for flow limiting
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ADIRU -primary source of altitude for bleed source selection
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AGS -airplane air/ground information for on/off control, temperature regulation and BITE
*
AIMS -engine on/off information for engine air supply on/off
*
CTC -request for lower precooler out temperature for temperature control
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CTC -request for high stage pressure increase for bleed air source selection
*
CTC -pack inlet pressure for pressure regulation and overpressure functions
*
CTC -pack flow information for flow limiting
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DLODS -strut/wing duct leak information for on/off
*
EEC -high stage pressure for overpressure protection
*
EEC -alternate ambient pressure source for bleed source selection
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FSEU -slat position for flow limiting
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HYDIM -ADP C1 and C2 on/off for flow limiting
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OPAS -position of the engine bleed air switches and the engine start selectors for on/off control
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WES -airplane stall for flow limiting.
These are some of the data sources and uses for information given directly to the primary mode:
*
Engine bleed air switch -in/out position for on/off control function
*
Engine start selector -START position information for on/off control function
*
Engine fire switch -in/out position for on/off control function.
The backup mode gives information about its inputs to the primary mode.
The primary mode also has a BITE function.
Backup Mode
The backup mode monitors the primary mode for its on/off status and controls the engine air supply system when the primary mode is off.
The backup mode has functions that operate when the primary or backup modes are in control. Other backup mode functions only operate when the primary mode is off.
EFFECTIVITY BEJ ALL 36-11-00
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These backup functions operate when the primary or the backup mode is in control:
*
On/off control -engine bleed air switch, engine fire switch, engine start selector
*
Overtemperature protection.
These backup functions operate only when the primary mode is off:
*
On/off control -strut/wing duct leak
*
Overpressure protection
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