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The main engine electronic control units (EECs) send data to
and receive data from the display electronic units (DEU) on
ARINC 429 data buses.
The DEUs send data to the main engine EECs on the EEC/APU
buses. The EEC/APU buses have this data:
* Flight number
* Baro corrected altitude
* Mach number
* Total air temperature
* Total pressure
* Static pressure
* Time/date
* Target N1
* ADR discrete word
* CDS DEU discrete word 1
* CDS DEU discrete word 2
* CDS DEU discrete word 3
* BITE test word.
The ADR discrete word has this data:
* Angle of attack data
* SSEC data
* VMO/MMO data
* Overspeed warning status
* Antice system status
* ADR fail status.
The CDS DEU discrete word 1 has this data:
* Engine running status
* Engine start valve status
* Main landing gear position status
* Flaps position data.
The CDS DEU discrete word 2 has this data:
* Engine alternate mode select status
* Engine start lever position status
* Engine ignition switch status
* Engine start switch position status.
The CDS DEU discrete word 3 has this data:
* ECS isolation valve status
* ECS pack status
* ECS pack flow status
* Antice status
* Engine bleed switch status
* Flap position data
* Air/ground system status.
The EECs use this data in the engine control function.
The EECs send data to the DEUs on two seperate EEC buses.
One bus has EEC channel A data and the other has EEC
channel B data. The EEC buses have this data:
* BITE data
* Engine start mode
* Engine starting status
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* Ignition system status
* Engine running status
* Control mode switch position
* Minimum idle
* Idle selected
* N1 speed data
* N2 speed data
* Overspeed governor status
* Engine starter cutout
* Exhaust gas temperature (EGT) data
* Fuel flow data
* Fuel filter status
* Oil pressure data
* Oil temperature data
* Oil filter status
* Thrust resolver angle (TRA) data
* Thrust reverser status
* Engine thrust
* Engine sensor data
* EEC software version
* Engine serial number
* Engine actuator positions
* Combustor fuel air ratio
* EEC channel in control
* Start lever position
* Airplane on ground selection status
* Engine thrust rating and airplane model compatibility
* Airplane model
* Engine rating
* Engine options
* EEC alternator status
* Engine position
* Engine bleed load
* Air data status from ADIRUs
* Internal EEC fault status.
The DEUs use this data for the engine display function and the
BITE/monitoring function via the CDUs.
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Engine Start Switch
The engine start switches send two ground discretes to the
display electronic units (DEUs). One discrete gives a signal that
the engine start switch is in the flight position. The other
discrete gives a signal that the engine start switch is in the
ground or continuous position.
The DEUs also send a ground discrete to the engine start
switches when N2 is less than 55%. This holdup discrete
energizes the engine start switch solenoid to hold the switch in
the GRD position. When engine N2 is more than 55%, the
ground is removed and the start switch returns to the OFF
position.
Engine Start Lever Relay
The engine start lever relays send ground discretes to the DEUs
to indicate the engine start lever position (idle or cutoff).
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CDS - ENGINE INTERFACES - 2
CDS - ENGINE INTERFACES - 2
　
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