Whats the reason for that then?
Witnesses in general? They are usually too excited/shocked from the event to be reliable.
Witnesses that have some aviation competence? They tend to overate their competence and judgement of what happeded. However, this doesn't effect the reliability of technical experts (aircraft mechanics, avionic technicians, flight instructors, etc. who did NOT witness the event) later examining the evidence (wreckage, films, etc.)
I need to point out that I am not and have not been an aircraft accident investigator (I have been an auto accident investigator later as a cop but that philosophy is different; don't ask me why, I don't know) My experience has been as a maintenence/repair/ground ops technician (particularly in aviation metals early in my career) and, later in my career, as a supervisor for those activities as well as a recreational pilot. My main university degree (Bachelor of Professional Aeronautics with a minor in Aviation Safety) entailed coursework in accident investigations. My references to my attending crash sites were not as the "investigator" as such; rather as a lower team member (usually trying to salvage evidence) and in the one case I was working the flightline the night an F4 crashed on take-off (hence full fuel and munitions) Just want to be clear so I'm not over-claiming professional qualifications I don't have.
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