ASCPC
The ASCPC supplies the EEC with duct pressure and pressure regulating and shutoff valve status.
OPAS
The OPAS sends the EEC a signal when the autostart switch is on.
EDIU
The EDIU changes ARINC 429 data from the EEC to ARINC 629. It also changes ARINC 629 data to ARINC 429.
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ENGINE FUEL CONTROL -AIRPLANE INTERFACES
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ENGINE FUEL CONTROL -ENGINE INTERFACES
General
Most engine interfaces with the engine fuel control system are with the EEC. A few are with the ERU.
The EEC controls most engine components and receives feedback from them. Many components supply the EEC with data for engine operation.
The EEC uses torque motor drivers to move multiple-position actuators. It uses solenoid drivers to move two-position actuators (open/close).
T/R Maintenance Switch
The thrust reverser maintenance switch puts the EEC into a maintenance mode. This permits the thrust reverser to be moved without running the engine.
T/R Isolation Valve
The EEC uses a solenoid driver to control the thrust reverser isolation valve. Control is through the ERU. The EEC receives feedback of the valve position from a pressure switch.
ERU
The engine relay unit makes two signals out of one-source signals, and sends them to each channel of the EEC. The ERU also contains switch devices that the EEC controls with solenoid drivers. The switch devices are for these components:
*
P2/T2 probe heat
*
Exciters
*
Starter air valve solenoid.
FMU
The EEC uses a torque motor driver to control the position of the metering valve in the fuel metering unit. The EEC uses solenoid drivers to control the run, cutoff, and cutback functions of the FMU. The FMU supplies the EEC with feedback of metering valve and cutoff valve positions.
PMA
The permanent magnet alternator supplies the EEC with dedicated engine power. It is also the source of the N2 signal.
Sensors
Sensors on the engine supply this information to the EEC:
*
Engine pressures
*
Engine temperatures
*
Engine speeds
*
Engine fuel system data
*
Oil system data
*
Component positions
*
Electrical power system data.
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ENGINE FUEL CONTROL -ENGINE INTERFACES
FOC Bypass Valve
The EEC uses a torque motor driver to control the position of the fuel/oil cooler bypass valve. The EEC receives feedback of the valve position.
Engine AOC Valve
The EEC uses a torque motor driver to control the engine air/oil (AOC) cooler valve. The EEC receives feedback of the valve position.
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