Icing
This is a spillover from the Tech AF447 thread.
It is claimed the pitot on the A330 have passed all required tests, and clogging at FL 350 is outside the certification criteria.
In the distant past, I remember hearing how new airliners were tested for icing by following a plane that was spraying water while above the freezing level. What is the routine for icing tests? Can this not be done at flight levels?
GB