MD600 Driver,
Re: Nitesun. As Shy correctly pointed out, the Nitesun power comes from the mission bus which is only available with both generators on line. One of the first signs that an engine has quit will be all the police role equipment failing. Also, with only battery power available, it is only the fixed lamp on the nose which is available unless, with sufficient time and height, the Shed Bus Switch in the roof panel can be made which will allow the steerable landing lamp under the fuselage to be used.
Another thought that occured to me was that, in relation to a witness describing the aircraft falling end over end - once the aircraft was inverted, the weight of the main gearbox and engines would have kept it that way wouldn't it??