An unusual technical defect in the plane's commander's seat caused the tragic crash of Air India Flight AI-171, killing 247 people, most of them medical students who were in a residential building where the plane crashed.
According to the preliminary report by the Air Accidents Investigation Authority of India (AAIB), released on Tuesday, the plane's commander's seat suddenly slid backwards during takeoff, triggering a fatal chain of events that led to the loss of control and the crash of the Boeing 787 aircraft.
How the tragedy happened – The decisive seconds
From the black box data it results that:
During takeoff, the commander's seat became detached due to a failure of the safety mechanism.
His body pulled the power levers to the neutral position, causing an immediate reduction in the engines' power.
The copilot attempted to restore power, but was unable to do so due to the pilot's position blocking the levers.
Within 38 seconds of the malfunction, the plane crashed into the ground.
What did the technical investigations reveal?
The commander's seat had undergone maintenance just 11 days before the accident, but had not been tested after the repair.
Broken safety screws in the seat mechanism were found in the wreckage.
The power-thrust system on the Boeing 787 has no protection against accidental pullback, which made it easier to lose control.
Emergency measures for the airline industry
The FAA and EASA ordered an urgent inspection of pilot seats across the entire Boeing 787 fleet within 72 hours.
Air India grounded 12 aircraft with similar maintenance histories.
Boeing announced a redesign of the seat system and reinforcement of the control levers - implementation will begin in the third quarter of 2026.
"Even a small defect can lead to tragedy"
Aviation expert and Boeing 767 captain, Grigoris Konstantelos, commented:
“Aviation remains the safest way to travel. But when small elements fail, the result can be tragic. Every accident is a lesson to make flying even safer.”
The final report is expected on July 30, 2025, while an international flight safety summit is being held in August, where new standards for cabin safety are expected to be discussed.