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According to the article, the pitots did, in fact, de-ice and return to normal functioning. However, apparently the alternate law needs to be manually reset, since the plane remained in direct input mode, and thus the pilots managed to stall the plane even though its instruments had all recovered.

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.

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