Thank you gentlemen. The reason I posed the question is that I recently attempted to dispatch an A319 bound for MEX with an ADIRU inop. (Can't recall which one, #3 rings a bell.) As you know, MEL prohibits use of FLAPS CONFIG 1+F in this scenario. We had no spare ADIRU on hand, and the crew refused the aircraft on the basis that they needed to use 1+F out of MEX.
Were they pulling my leg? Perhaps they didn't wish to go flying that day? Couldn't they simply use FLAPS 3?
Appreciate your input.