When I did some training in the US (helicopter), it was emphasised that 2/3 of fatal helicopter accidents involve one or more of:
- poor weather
- night
- flying below 500ft agl (outside take-off/landing)
Since avoidance of these are all within the pilot's control, the thrust of the safety briefing was that by simply avoiding these three aeas, you can keep yourself out of 2/3 of fatal accidents.
BW