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Airplane Systems Discrete Inputs
The ECU receives these airplane system inputs:
* ACS pack ON/OFF
* Air/ground indication
* Airplane model
* APU automatic fire shutdown
* APU BITE power up
* APU bleed command
* APU fire warning switch
* APU fuel shutoff valve position
* Air inlet door position
* APU OFF signal
* APU ON signal
* APU remote fire switch
* APU START signal
* Generator load
* Main engine start/run
* Start converter BITE data.
APU Inputs
These inputs are from the APU to the ECU:
* Air inlet temperature
* APU bleed air valve position
* APU fault data
* Data memory module (DMM)
* Delta pressure (DP)
* EGT (2)
* Filter pressure switch
* Fuel flow
* Fuel temperature
* IGV position
* Inlet air pressure (P2)
* Low oil pressure switch
* Oil level
* Oil pressure
* Oil temperature
* SCV position
* Speed sensor with 2 signals
* Total air pressure (PT).
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General
The ECU supplies APU data to airplane systems and it controls
APU functions.
ECU ARINC 429 Outputs
The ECU supplies this APU data to the flight management
computer (FMC) through the ARINC 429 bus. The FMC system
shows this information on the control display unit (CDU):
* APU and ECU part numbers and serial numbers
* APU fault data
* APU maintenance data
* APU running status (over 40 indications, 4 pages of status
when you select Input Monitoring on the CDU)
* Oil quantity.
ECU Outputs to the APU
The ECU sends signals to control these APU components:
* Bleed air valve (BAV)
* Fuel metering valve
* Fuel solenoid valve
* Flow divider solenoid
* Ignition unit
* Inlet guide vane actuator (IGVA)
* Surge control valve (SCV).
ECU Outputs to Other Airplane Systems
The ECU also sends these analog signals:
* APU EGT indicator
* APU electrical load shed command
* APU fault light (amber)
* APU fuel shutoff valve
* APU air inlet door
* APU low oil pressure light (amber)
* APU maintenance light (blue)
* APU overspeed light (amber)
* Ready to load APU GEN OFF BUS light on at 95 percent
speed (blue)
* Start command.
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General
The ECU does tests of the APU components and its internal
functions. The ECU does some component tests continuously
and others only when the APU is in a specific mode.
The ECU memory holds up to 99 faults. When the memory is full,
new faults record over the oldest faults.
Monitored Components
The ECU monitors these components:
* Air inlet temperature (T2) sensor
* APU air inlet door
* APU fuel shutoff valve
* Bleed air valve (BAV)
* Data memory module (DMM)
* Delta pressure (DP) sensor
* ECU (internal monitors)
* EGT thermocouple (2)
* Flow divider solenoid
* Fuel metering valve
* Fuel solenoid valve
* Fuel temperature sensor
* IGVA
* Ignition unit
* Inlet air pressure (P2) sensor
* Low oil pressure switch
* Oil level sensor
* Oil pressure sensor
* Oil temperature sensor
* Filter pressure switch for starter-generator filter
* Speed sensor
* Start converter unit (SCU)
* Start power unit (SPU)
* Starter-generator
* Surge control valve (SCV)
* Total air pressure (PT) sensor.
APU CONTROLS - ELECTRONIC CONTROL UNIT - FAULT MONITORING
　
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