PPRuNe Forums - View Single Post - AF A330 PitotTubes vs. A320/319/321 Pitot Tubes
Old 9th Jun 2009, 00:25
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BigHitDH
 
Join Date: Jul 2003
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The original AD was put in place because of burrs inside the drainage holes, leading to accretion of ice/contamination.

Google it, you'll find plenty of info.
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