.....the fitting may have backed
I just experienced this sort of thing a few months back. I was having a conversation with someone and standing at eye level with his rig. As I went aboard I noticed that he had "a lot more threads" visible than I thought was normal(StaLok) I did not know this guy well and hey, what do I know?
A few minutes later as he was speaking to me and in the middle of a sentence there was a loud bang as that same eye popped apart. It was at his eye level and it was only because he was looking at me when it popped that he did not lose his eye---he did get a nasty bump on his cheek.
We re-assembled the eye and it screwed all the way in with very little thread showing.
The eye was attached to a hydraulic tensioner and we noticed that every time he pumped that tensioner, the piston would rotate---this evidently --over time--caused that eye to gradually unscrew.
It does happen.
Regular inspections help.
Ed Zacko
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