[QUOTE]In that case, with a failed EPR... your A-330 is grounded. No MEL deviation.[QUOTE]
DEAR BEL
This not correct so: In case of inop EPR you can go on RR Engines in N1 Control mode for 10 days.(MEL 73-25-01-C)
EPR Mode is only an Indication for Thrust. Every Engine has a "in house" different EPR for a special thrust. To make it easier for pilots, the Engines get a EPR Trim, so that for example ENG1 and 2 have EPR 1,4 for FLEX TO, Thrust is the same, but differrent N1 and also EGT(but also here is a trim/equalisation).
Other Engines get a N1 Trim to indicate the same N1 for the thrust set.
The A330 gives You different warnings in Case of EPR malfunctions and/or Thrust diagree during TO, but there is no specific limit for that, only one FADEC selects a different EPR.
This failure is normally an indication for a broken EEC.You will get a different Warning before You will see a uneven EPR, because one parameter and/or control will run out of cycle.
rgds