Used to work on 747/100,200.400s, near disaster on one of them changing a component on outer engine on a turn round taking a while sudden;ly realised that I was standing up when I started was now bending over, to my horror bottom of engine was about 1 inch from resting on my engineering steps, pulled steps away and saw fuel bowser pumping fuel on opposite wing still shudder at the thought of [A] cutting bottom of steps off or[B] defuelling air craft and [C] standing on the lino in front of shift managers desk trying to explain ect