Mode S U/S, what now?
Yesterday, the ATCO suddenly told us that he sees no data on the screen; i.e only mode A and C active but not mode S. However, there was no fault indication in our equipment. If the problem persists, are we allowed to continue flights in that condition until next MX (aircraft is C525 so I guess flights in RVSM airspace are ruled out or all IFR flights in general?),
Cheers
Cecco