"George" wrote in message

My uncle was killed in aircraft accident in WWII, 1940 something.

I don't know if it is possible to get accident report that old. If it is
what
information do I need?

I think 1940 would be old Department of Commerce stuff. If such records
still exist, they'd likely be archived somewhere. I'd start by calling the
FAA, and be prepared for a long and winding road.