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Here is the TSB Canada incident report ...
Thanks for the document AirBubba.
I'm not being flippant, I am interested to know the purpose of the "unknown" fields in the document. Can the number of unkown injuries ever exceed zero? What exactly is this field used for?
It is true that the number of people on board aircraft is normally known. So, the Unknown field is for when an a/c collides with that famous school building or a large tower in the middle of a city. You can never know exactly how many people are in the school/offices/flats at impact as people might be visiting, be there illegally and so on.
Currently, in the UK, there are investigations of a terrible fire in a London block of flats that destroyed the building - the number of deaths will only ever be "At least nn" because no one knows who was there and some bodies will be far beyond recognition.