Does anyone actually know of any double engine failures - within say 30 seconds of each other - in twin engined helicopters? Perhaps in early C30 S76 days, pre-containment mods? And if so, was autorotation established successfully? Just wondering how likely it was for an experienced pilot like Dave not to dump the lever - should this have occurred. Another point; on modern IFR twins, with so many warning and cautions, visual and audio, could a delay identifying exactly what the alarms meant have cost critical time before lack of power to the rotors was identified and the lever dumped? Don't fly EC135s, but is the NR displayed digitally or graphically? Have to say a needle on a dial is much easier to read crudely than a digital number display.