I learned to fuel them as line boy, and then when I had enough ratings, I was hired in by the company that was flying them. I always waited on the Chief Pilot at that time hand and foot. It paid off for me, verse the Flight Instructors at the field, including my own that were still teaching a year or more later. They did nothing but bad mouth the company. While flying the Mu-2, I did have a couple line boys that I asked prior to going into the FBO if they knew how to fuel them. They didn't, and I would catch them prior to the tip tank being full and on the ground. Always had to watch like a hawk. It was a hassle with a single point hose and having to go back and forth between the two tanks. You could fill them half full, then go to the other side to top it off. Plus they were pressurized, so if I or the line boy didn't relieve the pressure, he usually got a face full of jet fuel spray. The PT6 guys(King Air guys) couldn't fly them and didn't want to fly them. Most were afraid of the plane. I had a heck of a lot of respect for it. It could kill you quicker then *****. I later flew the King Airs and Cheyennes with the PT-6's. I was glad that I had the Mu-2 experience prior, since the PT-6 planes were extremely easy to fly.

But!! To build a successfully flying Mu-2 model is an accomplishment! Never thought I would see a flying model of it.