Pitot tubes are always under strong heating during flight( so strong that the steel may blue). The problem with the 330 pitots brand in particular( there are se

Pitot tubes are always under strong heating during flight( so strong that the steel may blue). The problem with the 330 pitots brand in particular( there are several ) is that they cant evacuate water fast enought and sometimes they could become unserviceable ( as it happened to the af ) as they don't sense air preasure anymore.