Hot fueling is another area of concern for fires, one spark generated by static from down wash of the rotors can and has started fires aboard several vessels one that I can remember was a Wessex Mk-31B of the RAN aboard HMAS Supply back in the early 80’s.

As for the video clip, I know the CH-46’s used to have problems with fires like this, apparently they would over heat the engines during take off- especially in the Gulf or Med. Given the ambient outside temp being high and the Pilot revving the engines over standard procedure- next you know boom there’s a fire. I saw it happen once and rather than try to put it out, the USN just pushed the helo into the drink, they said that the helo’s are too old anyway and needed replacing.