Both engines failed on the helicopter which crashed into a Glasgow pub resulting in 10 deaths, an interim air accident report said today.
In the latter stages of the flight on the night of November 29, the right engine "flamed out and shortly after the left engine flamed out", said the report from the Air Accidents Investigation Branch (AAIB).
But the report also said that 76kg (168lb) of fuel was left in the main fuel tank and the continuing investigation into the crash "will seek to determine why a situation arose that led to both the helicopter's engines flaming out when 76kg remained in the fuel tank group".
The AAIB said the continuing investigation would also want to find out "why no emergency radio transmission was received from the pilot, and why, following the double engine failure, an autorotative descent and flare recovery was not achieved".
This was the second interim report into the crash into the Clutha bar in Glasgow of the Eurocopter EC135 helicopter, which was assisting police at the time.
Civilian pilot David Traill and his two passengers, Pc Kirsty Nelis and Pc Tony Collins, were killed, as well as seven people inside the pub.