In particular, the investigation will seek to determine:
Why a situation arose that led to both the helicopter’s engines flaming out when 76 kg of fuel remained in the fuel tank group,
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.
I'm surprised they'd expect an emergency transmission; I'd imagine the pilot was far too busy to waste time on pointless radio transmissions.
I wish them luck progressing the other two mysterious points, though. I think they'll need it.