First post in the Tech Ops. Kind of like a non-swimmer in the deep end, so please be easy on me.
I worked a TW flight a few years ago at COU east of STL. I remember it was really late and we were called by TW to see if we would stay around to fuel the plane when it came in. It missed approach the first run, and when it did finally make it in, they taxied to a remote stand and shut down.
Long story short, we didn't have a GPU powerful enough for startup. The crew told me that low fuel procedure was to dump the fuselage tank into the wings, basically exhausting the only tank usable for the APU. So, when the plane shut down, and we didn't have a GPU, they couldn't start up.
The fix was to gravity feed fuel (2 hours later after lots of calls to STL MX). I turned a valve under the #2 leading edge slot which allowed fuel to drain into the center fuselage tank. After enough fuel was in they were able to start the APU off the battery.
I guess what I'm asking is, did this happen a lot? And if so, wouldn't this happen frequently?
As a side note, I was a junior in College, and the plane had just flown the U of Illinois football team to play U of Iowa. It was full of catering. The FA's were so happy to get back to STL they gave me and the crew I was over all the beer, banana's, and subs on the plane. My roommates thought I was a hero for a week.