Engine Interface Unit (EIU)

The Engine Interface Units’ (EIU) main functionality is to collect multiple analogue sensor data and convert them into digital signals. The transformed data is sent via RS-422 protocol to the Engine Indicating and Crew Alerting System (EICAS) from Universal Avionics.

Via the ARINC 429 output data is sent directly to the Flight Data Recorder (FDR).

The Software is certified according to DO-178B DAL B.


Sensor signals

  • Torque
  • EGT
  • Fuel flow
  • RPM
  • Oil pressure
  • Oil temperature
  • Fuel quantity with a cycling output to read total fuel quantity, outer tank fuel quantity and feeder tank fuel quantity
  • Landing gear hydraulic pressure
  • Consumed fuel with input for fuel consumed reset switch
  • Outside air temperature (only input)
  • Flap position
  • Trim position – stabilizer
  • Trim position – aileron
  • Trim position – rudder
  • Propeller de-ice – current
  • Beta light
  • Ignition light
  • Input for engine interface unit 1/2 select
  • Side strapping for engine interface unit
  • Input for weight on wheels