RVSM contingency procedures

[Microburst2002]

Now we are getting somewhere...

1.1.3.
Level Bust Definition
A level bust is defined as a situation in which a flight does not capture or does not maintain the Flight Level or Altitude assigned to it by ATC with a deviation of more than 300ft.

MCDU2: note the "more than" 300 ft. At 300 ft you are still OK...

Capt Fathom

I fly global. You can find me in nearly every airspace of the world.

PD I hate that bloody emoticon...