British investigators say ice crystals are the likely culprit in several 2012 incidents where operators received erroneous airspeed or altitude readings. In the first incident, pilots of a British Airways (BA) Airbus A321 on initial approach to London Heathrow Airport on Apr. 20, 2012, after a flight from Stockholm Arlanda Airport, received wildly fluctuating air speeds on primary and backup flight displays when entering cloud tops at 14,000 ft. The erroneous readings lasted between 10 ...


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