The head of the French agency leading the probe into the crash of Air France Flight 447 said on Saturday that signals from the plane before it disappeared show its autopilot wasn't on.
The airplane, which was carrying 228 people from Brazil to France, disappeared minutes after flying into an extremely dangerous band of storms Sunday night, but what exactly caused its electrical systems and cabin pressure to fail remains a mystery.
Paul-Louis Arslanian said it was not clear if the autopilot had been switched off by the pilots or had stopped working because it received conflicting airspeed readings.
Plane manufacturer Airbus said the probe found the flight received inconsistent readings from different instruments as it struggled in a massive thunderstorm.
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