I work on B757 and B767 with RB211 engines, and B777 with Trents and A319/320 with V2500 engines.
Over the years I have had many EEC faults on the RR engines and The MEL has always let me dispatch the aircraft. On B757 both EEC may be inop, and on B767 and B777 normal mode may be inop and C1 faults are allowable.
But on the V2500 both channels of both FADECs must be serviceable. There are a couple of messages that are dispatchable, but last week I was trapped and was AOG for an EEC which had a fault on one channel.
Question is, why are the RR engines allowed to fly with faults, whilst the IAE engine cannot?
I can understand the B757. The EEC is only a limit controller over a mechanical FCU.
But the B767 RB211 is fully electronic and the B777 is a real FADEC.
Any one out there who can shed some light on this.