RVSM
Thanks Mad(flt),
for your EASA - AD list.
But thats not how the system works.
Maybe it shows up next week.
You have to do an RVSM check on aircrafts every year,
where you look into pitot-tubes with instruments ,
in connection with an ATC-TEST.
That should avoid Airpeed- failures.
But, what, if the guys , washing the airplane,
forget to remove the "blanking tape"
after finnishing their work.
Happens before, a couple of times.