Mon, May 23, 2011
Ice Formation On Speed Sensors May Have Led To Deep Stall
Unofficial, and we stress unofficial, reports about the
analysis of the cockpit voice recorder recovered from Air France
Flight 447 indicate that the captain of the Airbus A330 was not in
the cockpit as the events leading to the accident began to
The German magazine Der Spiegel reports that the
recordings seem to indicate that Marc Dubois, the 58-year-old
captain of the aircraft, was not in the cockpit when the trouble
began. He reportedly rushed back into the cockpit "shouting
instructions" to the the co-pilots in an attempt to save the
aircraft. It is not clear why he was not in the cockpit, but he
would not be required to be at the controls for the entire duration
of the trans-Atlantic flight.
The magazine says that investigators close to the analysis say
the recovered Flight Data Recorder shows that the crew took a
course it thought would avoid the worst of the thunderstorms in the
area, and that they had initially been successful, in that they did
not encounter any additional severe turbulence.
The magazine reports that analysts believe the airplane may have
entered a deep stall from which the crew was unable to recover. The
A330 requires precise speed management at altitude to prevent such
a stall, and if the speed sensors were iced over, such speed
management would have been very difficult, they say.
The accident investigation is being led by the French Transport
Ministry’s Bureau of Enquiry and Analysis (BEA).
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