As the Boeing Dreamliner Investigation In Investigation

Less than 40 seconds.

This is how long Air India 171 flight was in the air before it plunged into a densely populated neighborhood in Ahmedabad in one of the rarest aviation disasters in India in the last memory.

Investigators are now facing the gloomy task of sifting the fragments and deciphering voice and records of the Boeing 787 Dreamliner cabin to collect what went catastrophically in seconds after takeoff. According to international rules established by the UN aviation body IcaoThe previous investigation report should be published within 30 days and the final report is perfect for 12 months.

London planes related to Gatwick, piloted by Captain Subhal and Pilot Kondar, on Thursday at 13:39 local time (08:09 GMT), with 242 people and almost 100 tons per fuel. During the moments, the call from the master cracked from the cab. That would be the last short broadcast. Then there was a height loss and an emergency covered by flames.

Captain Kishor Pond, a former investigator of the Indian Aviation Investigation Bureau (AAIB), calls it the “rare” accidents – controlled by flight to the area only 30 seconds after takeoff. “As far as I know, nothing like this has never happened,” he said to the BBC.

Has both engines failed with bird birds or fuel contamination? Were the flaps incorrectly extended, reducing the rise on a heavily loaded jet in high heat? Was the Maintenance Error during the engine service? Did the unintentional effect of the crew cut the fuel for both engines?

Investigators will check all these opportunities – and much more. The plane crash studies are based on the triangulation and elimination – relevant material evidence from the debris with recorded aircraft performances to create a concerted picture of what went wrong.

Each burnt cable will be studied, the turbine blade, aircraft service magazine, as well as signals and sounds from the flights and voice records – the so -called “black box”. The BBC appealed to the crash experts to understand how the investigation would continue.

Critically, the first tips on the ground can come from the wreckage of two engines, at least three investigators said.

“You can say that with damage, or create power engines when exposed – a fracture of the turbines at high speed,” says Peter Goltz, former head of the Transport Security Council (NTSB). “This is the first hint of what went wrong.”

Turbines are a decisive rotating components that play a key role in energy retrieval.

“If the engines did not produce power, the investigators are seriously in their hands – and move sharply to the cabin.”

What happened in the cabin will be revealed by the extended Boeing 787 air records – or “black boxes” – which, according to investigators, will help tell the story. (Indian officials say the records were restored from the catastrophe.)

These devices record extensive flight data and audio cabin – from pilot radio cetures to environmental sounds. Vocal records come from individual pilot circuits, radio transmission and microphone of the area, which selects the background noise in the cabin.

Data record records With high precision position of gear and sash, thrust settings, engine performance, fuel flow and even activation of the handle of fire.

“If the flight data recorder shows that the engines are making full power, then the attention will be transferred to the sash and the rails. If they are expanded as needed, it becomes a very difficult investigation,” Gelz says.

The flaps and rails increase the lift with smaller speeds, helping the aircraft fly and land safely, allowing it to fly slower without delaying.

“If (the trail leads) to the problem in the flight control system, it causes serious problems – not only for Boeing, but for the entire aviation industry.”

Boeing 787 flight control system is a very automated suite that manages navigation, performance and guidance. It integrates data from a number of sensors to optimize the aircraft flight and fuel efficiency.

Of the more than 1,100 Boeing 787s worldwide, investigators need to determine whether the systemic issue may affect the world fleet – or a one -time failure, characteristic of this flight, experts say. “If this indicates a systemic problem, then the normative organs should make some rigid decisions very quickly,” Gelts says.

So far, there is no guilt from someone’s. On Tuesday, the Indian civil aviation ministry said the recent Air India Boeing 787 fleet inspection – 24 of 33 aircraft have so far been checked – “revealed any serious security problem”, adding that planes and maintenance systems met the existing standards.

Boeing President and CEO Kelly Ortberg said that on June 12, Boeing deposit to the Bureau of Investigation of India Aviation Crem (AAIB) for information about the Air India 171 flight according to the ICAO UN. “

Decipher data in AAIB Delhi laboratories will manage Indian investigators, and experts from Boeing, GE, Air India and Indian regulators. Investigators from NTSB and UK will also participate.

“From my experience, teams can usually determine what happened fairly quickly,” Goltz says. “But the understanding of why it happened can take much longer.”

The debris can give other clues. “Each part – wire, nut, bolt – will be carefully collected,” says Mr.

Usually the debris is moved to a nearby hangar or a safe object set out to identify the nose, tail and sources, and then connect together. In this case, depending on what the flight data and voice records are discovered, complete reconstruction may not be required, investigators say.

The importance of debris changing by accident, investigators say. During Flight MH17 Airlines Malaysia Airlines MH17In July 2014, the impact on Eastern Ukraine was very important – the reconstruction of the nose revealed obvious damage to the rocket missile.

In investigators, investigators also study fuel filters, lines, valves and residual fuel to check for pollution – which is easy to detect or exclude, the investigator, who preferred to remain unnamed. In addition, he believed that the equipment used before departure “was probably quarantine and already inspected.”

That’s not all. Investigators will collect recordings on maintenance and malfunction with the airline and Acars Boeing (aircraft address and reporting system), which transmits data via radio or Boeing and Air India, G -Chinta says.

They will consider all the flights run by planes and crew in recent months, as well as the technical magazine malfunction reported by the pilot and corrective actions taken before the aircraft.

Investigators also study pilot licenses, training records, simulator performance and instructors’ remarks – including how pilots processed scripts such as engine failures in advanced flight simulators. “I believe that Air India would have already provided these records of the investigation,” Mr.

Investigators will consider the history of all the components of the aircraft that were removed and replaced, studying the reported defects on any periodic issues – or signs of problems that could affect this flight.

“These investigations are unusually difficult. They require time, but there will be early indicators that it probably went wrong,” Gelz says.

The big reason is how far the technology has come. “In one of the first accidents I investigated in 1994, there was a flight recorder that tracks only four parameters,” he says.

“Today’s records record hundreds – if not thousands – every second. Only this has transformed the way to investigate accidents.”

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