wrote:
Please name one accident of a glider with auto hookups that could have
been prevented by a positive control check. I sure don't know any. A
seized bearing will be detected by simply moving the stick. In all
gliders I know there is no scenario of control failure that would
necessitate a positive control check for detection.

FWIW, I've owned 8 different gliders from 4 different manufacturers with
one or more automatic hookups, and every single one had at least one
failure mode where you could jam things together without properly
engaging the corresponding hookup. It was usually hard to get things
wrong, and the control stick would usually (but not always) bind when
something wasn't properly engaged, but it could be done, and I always do
PCCs as a result...

Marc