I read on a different thread that you should not apply brakes on an airplane while it's moving aft.
I remember when i was a f/o at a md-80 operated airline some commanders put on the electric hydraulic pump (not engine driven) during push back and start up. This, they explained, was a back up incase the towbar broke during the push.
Now i'm in the left seat on the same type and our sop's don't include having the pump on during pushback but i still imagine that braking is the only thing one can do if the towbar collapses......
Can someone explain why you shouldn't apply the brakes in such a situation?
