It is a problem for the Pitot manufacturers....Qantas did a lot of work on the pitot tubes of their 767 fleet after it was found that there were sheets of ice forming on the inside of the fuselage, around the rubber seal of the pitot tube. They installed a heater for the O ring to try to solve this problem before it becomes a serious issue. The Qantas fleet does not use the default Pitot tubes that come with the A330, they have their own supplier. Airbus does NOT build or produce Pitot tubes, they purchase them from another supplier as well.