The errors of two Indian pilots before the fatal crash will be the focus of the investigation into the tragedy, according to reports.
All except one of 242 board 787 Dreamliner, all died last month in a medical student hotel in a piled suburb, less than a minute from Ahmedabad Airport.
Including local people, a total of 270 people were killed.
According to the Wall Street Journal, preliminary findings by U.S. officials show that fuel flow from the two engines that control the jet are shut down, causing the loss of thrust during takeoff.
These findings can explain why the jet-piece emergency generator (called RAM gas turbine) seems to have been activated before it is activated.
Early assessments by U.S. officials so far have not indicated problems with the aircraft or its engine, people familiar with the investigation told the newspaper.
“There is nothing to say about the cause of the crash as the investigation is underway,” Indian civil aviation official Murlidhar Mohol told NDTV News at the time.
“It’s a very rare event – both engines stopped together and never happened.”
There are more than 9,000 hours of flight time between Captain Sumeet Sabharwal and co-pilot Clive Kundar.
A preliminary report on the doomed flight has been submitted to Indian authorities but has not been made public.
The Civil Aviation Authority of India has no obligation to disclose the report.
Debris from Indian Air Boeing 787-8 Dreamliner aircraft – Adnan Abidi
Before the disaster, Sabharwal sent a Mayday call. However, all contact was lost after the plane reached a maximum altitude of only 400 feet above the runway.
Video footage shows the jet suffering catastrophic lift when the pilot said he was losing power.
The plane then slid to the ground, and after disappearing after a group of trees it crashed hundreds of yards from the end of the runway, amid the fire explosion.
The crash was Boeing's first fatal accident. However, after a series of safety and quality issues, the passenger plane has suffered reputational losses.
Dreamliner entered service in 2011 and is popular among commercial airlines and is often used for international long-haul routes.
The delay in investigations led by Indian authorities and the delay in refusing to release information to the public has inspired frustration among some U.S. government officials.
The Indian government said data extracted from the aircraft's black box, which was started on June 24 by a team of Indian and U.S. experts, including the U.S. National Transportation Safety Commission.
What they are talking about is the slow pace of downloading, analyzing and sharing black box content, frustrating U.S. officials, the insider added.
The investigation will also examine the aircraft's engine thrust capability, its flap setting – which affects the altitude the aircraft can gain, and why the aircraft's landing gear remains extended.
Vishwash Kumar Ramesh is the only survivor of the accident
Maintenance records and crew actions are also under review, with bird strikes reportedly being excluded.
Vishwash Kumar Ramesh, 40, is the only survivor of the crash.
The businessman from Leicester sat in a seat 11A, which was close to the front of the plane and cut off from the rest of the fuselage during the crash.
Mr Ramesh suffered multiple injuries, including contusions to his chest and deep tear on both feet, but managed to leave the crash. His brother was killed in the accident.
Together with 169 Indian nationals, Canadians, and seven Portuguese nationals, they killed 53 British nationals.
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