Ground lock pins?? As a tug driver ( limited knowledge! ) I will only tow empty 777 / 747 ( my main a/c ) with them in.
Perhaps it's the fact that the nose overhangs my cab???
Different airlines display different rules, but I can insist on them being IN if I'm responsible for the tow!!
Never a puchback though..... Onlt STEERING bypass......
I had a ' thing ' with a pilot who refused to put his beacon on before pushback, I said to him, ' then why is ground lock pins part of your before starts then?? ' He replied by saying that they were before engine start, not pushback... So he'd be happy to find ground lock pins missing during the push.. I think not.. And the catering truck imbeded in his tail??? MAD boy he was!!!!