French investigators revealed further details Friday on the final minutes in cockpit of Air France flight 447, which crashed in the Atlantic Ocean in June 2009, killing all 228 people on board. The first reports of data obtained from recordings of black box of flight not offered no new information on dysfunction alleged sensors of speed on the Airbus A330, neither it provide new knowledge on the possibility of human error.
The report shows that the aircraft autopilot mode has been cut off about two hours after it took off from Rio de Janeiro Galeao airport, and that shortly after the crew took the commands they noticed that indicators of speed of the aircraft were defective. Then suddenly blocked aircraft then plunged into the ocean of four minutes more later.
Snippets of those recent tragic minutes appear in the report. The text describes the struggle of the pilot to regain control of the aircraft and includes some of their conversation.
Rapid descent of 38,000 feet
The Air France flight had been meeting with stormy weather in the mid-Atlantic where his problems began. Captain Marc Dubois said its two co-pilots that they were a "bit of turbulence" and that "we should find the same to come". He said while his two colleagues: "we are in the clouds layer." Unfortunately, we do not climb much, "leaving cockpit to rest."
Pilots on long-haul flights often turns to the bar to stay alert. Dubois was recalled to the cockpit by co-pilots after they encounter problems, but never resumed the controls.
The aircraft rapidly lost speed, but continued to climb on one of the orders of the pilot, reach an altitude of 38,000 feet (11,500 meters). According to Thierry Laffitte, former Captain Air France, this high-altitude is rare and was probably what led to the accident.
The aircraft stalled, before diving into the Atlantic at a speed of nearly 11,000 feet (3,350 meters) per minute. The aircraft's engines were operational and responding to commands from the crew.
"Is there no reason for [engines] to stop," said Laffitte. "But at some point the engines could no longer make the re-accelerate plan."
In the last exchange between crew members, a co-pilot tells the others, "go ahead, you have controls," after they simultaneously move their sticks aside.
Pitot tubes remain the main suspect
Investigators did not provide new information on pitot tubes - speed of the aircraft sensors, previous probes have identified as the probable cause of the accident.
Ongoing research efforts, which were extracted flight recorder and some of the bodies of the victims, were able to retrieve pitot tubes.
A renewed focus on the actions of the members of the crew followed the publication of the report, according to Patrick Smith, an American pilot and an aviation expert. Perhaps they do not react exactly as they should have,"said Smith. "But bear in mind that they were dealing with failures of equipment, degraded flight controls, stormy conditions and darkness."
"It is important to note that the accident is always the result of a chain of events," explained Laffitte. "He is convinced that blocked the pitot tubes were originally problems of evil vol." pitot tubes should never have worked. After that, we are facing human decisions - humans who could not or did not know how to find the right solution to the problem, "he says.
While investigators have been under pressure from the media to reveal the original data of the flight recorder, a comprehensive report on the crash - with a more detailed transcript of conversation crew - should not before next year.
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