well it s not properly blacksquare fault or other avionics like it has been suggested but in a variable of msfs not 100% reliable , this faulty variable is many time present in flight model as it s linked to the wind , it gave to the problem some random behaviors , and misleading in debugging procedure progress, anyway patch will come very soon (before the end of the week)!
to avoid duplicate post fix can be found on my dedicated topic for those who can’t wait for it 
caravan CTD [Fixed!]
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