A320 ENG 1(2) EIU fault
 

According to A320 FCOM, the following consequences affect the aircraft when ENG 1(2) EIU fault alert is triggered:
‐ Affected engine start is lost
‐ Autothrust control is lost
‐ Thrust reverser on the affected engine is lost
‐ When idle is selected, only approach idle is available
‐ Bleed corrections on N1 limit are lost.

Also according to FCOM, with the ENG 1(2) EIU fault, the INOP SYS are:
- A/THR
- REVERSER 1(2)
- ENG 1(2) START

I understand the A/THR is lost with EIU fault (1+2 lost). But anyone can explain why the A/THR is lost with a single EIU fault?

Autothrust sends a thrust command to the engine via a data bus managed by the EIU. With an EIU fault the engine relies on hard wiring from the thrust levers, so autothrust commands won’t work. You lose the autothrust on that engine and there’s no way to have autothrust on a single engine (except in engine failure or shutdown scenario).

Basically it would be a nightmare to manage with static thrust levers and frankly is difficult enough on a type with moving thrust levers. Easier with all in or all out, in my experience.

Thanks a lot Fursty for the logical explanation. Obviously make sense.
Cheers!