This terminal vertical acceleration and high terminal vertical speed when combined with the positive attitude and low bank of the aircraft is strongly indicative of the aircraft having departed into a deep stall and possibly a subsequent flat spin.
Just to remember: The conditions (mech. damages) of the debris recovered floating seems consistent with a flat spin "heading to RH" (
CW as viewing from top)
Exception: Galley "good conditions".
Edited: Please donīt consider what is in blue:
Question 1): Supposing a flat spin til the end. Typically, how many degrees per second?
If tail cone separated in flight
, was at low height as showed by "concentration" in seabed.
Question 2): Itīs possible (spinning to RH) hit the water slightly banking left? And if the VS detached before impact? LH would drop further?