I assume you don't know of any, nor the PPRuNe community by the look of it. Certainly Google doesn't.
There have been a few examples in replies in this thread: check replies #4, #5, #23 and #29.
A brief Google search found this:
https://www.ntsb.gov/about/employmen...06LA191&akey=1
http://www.aaiu.ie/sites/default/fil...2002_015-0.PDF
So it would appear the risk is relatively low, as long as people stick to standard calls and sop.
Well, perhaps the risk is relatively low and no life was lost... until now. I think the risk can be further reduced by what I'm suggesting, so WHY NOT implement it? (as used to be the case at my previous employer.)
Perhaps the towbar is designed to give before the gear assembly.
Perhaps... Perhaps not... In case of a pull it seems more obvious that shear pins might add protection, but when performing a pushback?
Perhaps you worrying too much about it.
Perhaps... future will learn... But in the mean time, I will still be worried when in my new company, my F/O, on his stretch, will tell the ground crew we received a pushback clearance before or without talking about the parking brake status.
