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Air India's Boeing Dreamliner crash: Inside the cockpit

The Wall Street Journal reported that a cockpit recording of the dialogue between two pilots on the Air India flight which crashed last month shows the captain cut off the fuel flow to the Boeing 787's jet engines.

The sequence of events on June 12 is detailed in the preliminary investigation report by Indian investigators, released on Saturday.

Air India Dreamliner VTANB landed at Ahmedabad as AI423 at 05:47 GMT.

07:48 GMT - An aircraft was spotted departing Bay 34 of the airport.

07:55 GMT - Air traffic control granted the taxi clearance to the aircraft. A minute later, the aircraft taxied backwards and lined up in preparation for takeoff.

08:02 GMT - The aircraft has been transferred from tower to ground control.

08:07 GMT - Take off clearance issued

The aircraft began rolling at 08:07 GMT.

Aircraft lifted off at 08:08 GMT. The report stated that "the aircraft air/ground sensor switched to air mode in accordance with liftoff."

Aircraft reached maximum airspeed of 180 kts at 08:08 GMT. "Immediately after, the Engine 1 fuel cutoff switch and Engine 2 fuel shut off switch transitioned one by one from RUN position to CUTOFF with a gap of 1 sec."

The Engine N1 and N2 started to degrade from their takeoff values when the fuel supply was cut off.

In the cockpit recording, a pilot is heard asking another why he cut off.

"The other pilot replied that he didn't do it."

The airport's CCTV footage shows that Ram Air Turbines (RAT) are deployed immediately after take-off during the initial climb.

The aircraft began to lose height before crossing the perimeter wall of the airport.

The RAT hydraulic pump started supplying power at 08:08 GMT.

The fuel cutoff switch for Engine 1 has been changed from CUTOFF (stop) to RUN (run).

The fuel cutoff switch for Engine 2 also changes from CUTOFF (stop) to RUN at 08:08 PM GMT.

When fuel control switches from CUTOFF are changed to RUN during flight, the full authority dual engine controls (FADECs) of each engine automatically manage a relighting and thrust recovery sequence.

Engine 1's core speed deceleration stopped and reversed. It then started to recover. Engine 2 could relight, but it was unable to stop core speed deceleration. Fuel was repeatedly added to the engine to increase core acceleration and recovery.

The pilot who sent "MAYDAY Mayday Mayday" at 08:09 GMT.

Data recording has stopped at 08:09 GMT.

(Reporting by Aditya Kalra; Editing by Jamie Freed) 08:14.44 GMT - Crash Fire tender leaves the airport premises to rescue and fight fires. (Reporting and editing by Jamie Freed; Aditya Klra)

(source: Reuters)