On Wednesday, January 29, 2014 6:17:11 PM UTC-7, Bob Kuykendall wrote:
On Wednesday, January 29, 2014 3:36:56 PM UTC-8, Dan Marotta wrote:



So, what's the real test, Bob? Would simply giving it a good tug after

hookup disclose a failure? Or would it simply not close over the ring, once

installed by the wing runner? I have only a CG hook - wouldn't it suffer

the same failure mode?



I'm sorry, I don't know the answer to that one.



The one failure I was directly involved with was where one side of the spring had broken, but the other side was intact. The result was that the hook appeared to function correctly, but it sprung open as soon as the towplane powered up. JJ can probably tell you more about this.



Bob K.

Same thing on CG hook, at least with two up. Pull on rope was not enough for the release to open. On another CG hook, release failure, but this was attributed to wear on one of the shafts. CG hooks get a lot of dirt, water (in come regions), and probably an annual cleaning.

Frank W.