Pushback
In addition to not being able to see behind you, if your using reverse thrust to pushback on one of these birds, you could possibly tip the tail if you apply the brakes too hard...
Regards,
noullet
I should have clarified my post and inserted \'Pushback\' on a Boeing 727 a/c...
Sorry if I unintentionally misled anyone here.
Regards again,
noullet