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Air India's Boeing Dreamliner crash: Inside the cockpit

Sources briefed by U.S. officials on their early assessment of the evidence said that a cockpit recording of the dialogue between the two Air India pilots that led to the crash last month confirms that the captain stopped the fuel flow to the plane's engine.

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

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

07:48 GMT - An aircraft was observed leaving Bay 34 of the airport.

07:55 GMT - Air traffic control granted the taxi clearance to the aircraft. A minute later, the aircraft taxiied from the bay via TaxiwayR4 and backtracked before lining up for takeoff.

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

Take-off clearance has been issued at 08:07 GMT.

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 reaches maximum airspeed of 180 knots at 08:08 GMT. "Immediately after, the Engine 1 fuel cutoff switch and Engine 2 fuel shutoff switch transitioned one by one from RUN 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, one 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 (RATs) 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 halted, reversed, and began 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.

08:09 GMT - Data recording has stopped.

(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)