The race is on for searchers to locate the black boxes from Air France flight 447, as their locator beacons are only active for 30 days. However, preliminary evidence has been released by the airline which shows that, in the minutes leading up to the crash, two key computers malfunctioned and the plane was not flying at its ideal speed.
The data provides a chronology, albeit cryptic, of what happened in the minutes before the plane’s failure.
3am (BST) – The pilot reports hitting tropical turbulence, data says the plane had passed through “tall, dense cumulonimbus thunderclouds.”
Apparently at this stage, the plane’s speed was “erroneous.” Every plane has an ideal speed at which to travel through difficult weather, and AF 447 was not traveling at that speed – it is unknown at this point, however, if the plane was traveling too fast or too slowly.
3:10am – Pilot is presented with a series of error messages in the four minutes leading up to the disaster.
The auto-pilot system was disconnected, either by the pilot or automatically. (Auto-pilot shut down when the system is faced with a serious error.)
It is possible the pilot disconnected the system to try to manually avoid a dangerous cloud zone – at this high altitude, this maneuver is extremely dangerous.
At this same time, another emergency backup system switched on – this system allows the plane to keep flying using minimum power, but reduces stability.
3:12am – Two vital computers, which provide information on altitude, speed and flight direction, stopping working correctly.
3:13am – Electricity breakdowns in two principal and auxiliary flight computers.
3:14am – Final message: “cabin in vertical speed,” which suggests a sudden loss of cabin pressure. It is unclear whether this loss of pressure was because the plane broke apart in midair, or if the loss of pressure caused the plane to break apart. (The theory that the break broke apart in the air is lent credence by a Spanish pilot who was in the area who claims to have seen an “intense white flash” in the air.)
Sources close to the investigation argue that some of the details in the chronology are false, namely the fact that the computers providing info on altitude, etc, malfunctioned.
Searchers are continuing to scour the area for debris, and more information on what happened. Read more…
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