India, July 19 -- The Aircraft Accident Investigation Bureau (AAIB) in its preliminary report on the chopper crash in Uttarkashi district on May 8 said that the chopper struck an overhead fibre cable with its main rotor while attempting an emergency landing.

The Bell 407 helicopter belonging to Aerotrans Services Pvt Ltd was en route from Kharsali helipad (Yamunotri) to Jhala helipad (Gangotri) when it went down near the Gangnani area of Uttarkashi district at 8.35 am, killing six people onboard.

According to the AAIB report, the helicopter had been airborne for approximately 20 minutes before it began descending from its assigned altitude.

The 59-year-old pilot, who had 6160 hours of flying experience, attempted to make an emergency l...