Seldom
Can you tell us if the aircraft was fully serviceable at the time of the crash, as in the final moments prior to the impact?
No - and the opposite is also true.
Very little in life can be proved irrefutably and this sad business is just the same.
At the end of the day, this aircraft flew into a rock for reasons unknown, and in precise circumstances unknown, with two pilots in it - indisputably.
Yes, well, you can go on looking for fragments of proof or lack of it all day but we can surmise what happened on the balance of probabilities. This is an everyday occurence in courts of law and BOI.
Are you saying, Vertico, that the pilots were just passengers, or do you think that they might have had some input - like accepting an aircraft that they were unhappy with for an important flight, and so on down the line?