Takata, attention !!!!!!!
Absolutely incorrect:
"L'avion est entré au contact de l'eau en ligne de vol avec une forte acceleration verticale"
Meaning:
en ligne de vol = horizontaly (not verticaly)
+ acceleration verticale = stalled
That's a very fast conclusion, to which, I for one do not subscribe.
Actually,
He said the plane "appears to have hit the surface of the water in flying position with a strong vertical acceleration".
(stress by me)
is a lot more correct.