Now Reading: AI plane crash probe: What happened before the Mayday name? Timeline of final moments | India News
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AI plane crash probe: What happened before the Mayday name? Timeline of final moments | India News
AI plane crash probe: What happened before the Mayday name? Timeline of final moments | India News
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NEW DELHI: Aircraft Accident Investigation Bureau (AAIB) launched its preliminary report into the Air India plane crash that claimed 260 lives in Ahmedabad.The report revealed that the lethal crash occurred after each engines’ gas management switches turned from RUN to CUTOFF, resulting in sudden loss of thrust.
Here is sequence of occasions as detailed in the report
- 11.17am: Air India Dreamliner VT-ANB landed in Ahmedabad from New Delhi as AI423.
- 1.18.38pm: The plane was noticed departing from Bay 34 at the airport.
- 1.25.15pm: The plane requested taxi clearance, which was granted by air site visitors management; a minute later the plane taxied from the bay to Runway 23 through Taxiway R4, backtracked and lined up for take-off.
- 1.32.03pm: The plane was transferred from floor to tower management.
- 01.37.33pm: Take-off clearance issued.
- 01.37.37pm: The plane began rolling.
- 01.38.39pm: Aircraft lifted off. “The aircraft air/ground sensors transitioned to air mode, consistent with liftoff,” the report stated.
- 01.38.42pm: Aircraft reached max airspeed of 180 knots. “Immediately thereafter, the Engine 1 and Engine 2 fuel cutoff switches transitioned from RUN to CUTOFF position one after another with a time gap of 01 sec. The Engine N1 and N2 began to decrease from their take-off values as the fuel supply to the engines was cut off. In the cockpit voice recording, one of the pilots is heard asking the other why did he cutoff. The other pilot responded that he did not do so. The CCTV footage obtained from the airport showed Ram Air Turbine (RAT) getting deployed during the initial climb immediately after lift-off. The aircraft started to lose altitude before crossing the airport perimeter wall.
- 01.38.47pm: both engines’ values “handed beneath minimal idle pace”, and the RAT hydraulic pump began supplying hydraulic power.
- 01.38.52pm: Engine 1 fuel cutoff switch transitioned from CUTOFF to RUN.
- 01.38.56pm: Engine 2 fuel cutoff switch also transitions from CUTOFF to RUN. “When gas management switches are moved from CUTOFF to RUN whereas the plane is inflight, every engines full authority twin engine management (FADEC) robotically manages a relight and thrust restoration sequence of ignition and gas introduction. Engine 1’s core deceleration stopped, reversed and began to progress to restoration. Engine 2 was capable of relight however couldn’t arrest core pace deceleration and re-introduced gas repeatedly to extend core pace acceleration and restoration.”
- 01.39.05pm: “At about 08:09:05 UTC, one of the pilots transmitted ‘MAYDAY MAYDAY MAYDAY’.
- 01.39.11pm: Data recording stopped. “The EAFR recording stopped at 08.09.11 UTC,” the report said
- 01.44.44pm: Crash fire tender left the airport premises for rescue and firefighting.
After the report was released, Air India said that it continues to ‘fully cooperate’ with the agency as it carries out its probe.In a post on X, Air India in the early hours of Saturday said it was ‘committed’ to help the families of the victims.“Air India stands in solidarity with the families and those affected by the AI171 accident. We continue to mourn the loss and are fully committed to providing support during this difficult time,” it said.Air India acknowledged the “receipt of the preliminary report released by the Aircraft Accident Investigation Bureau (AAIB) today, 12 July 2025,” it stated.
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