Marc Ramsey wrote:
Jim Vincent wrote:
Kevin, do you have any known examples of this happening? Flying off
the winch is very similar to a glider high scenario, yet I've never
had a problem releasing even under tension.

There have been a number of accidents apparently caused by Schweizer
hooks jamming on the tow plane when the glider gets too high. However,
most everyone has applied an approved fix from years ago, turn the
release assembly upside down and the jamming problem goes away...

Here's a 337 for a Pawnee:

http://home.att.net/~jdburch/Form337.htm

Marc