Le vendredi 24 mai 2013 02:00:05 UTC+2, son_of_flubber a écrit*:

Why would failure of a gap seal cause a spin?

It probably didn't really cause the spin on the DG-606, but the spin happened in a situation (speed, inclination, etc.) where it normally shouldn't have happened, and it probably hampered recovery. Airflow over the ailerons would be severely affected.