99% of the A&P/ IA mechanics will NOT fly in a plane they just worked on....
Just another reason I sold all my certified planes and built an experimental...
Also.. circling above the airport is not a bad idea either... I spent 80 or so hours orbiting above the Jackson Hole airport... 3000agl got me above the Delta airspace and unless they started launching rockets... I was not in any ones way... Tower was more then happy to help me out..
Another reason was if I had a major failure, the wreckage would fall inside the airport fence line... My usual joke to the local fire/rescue guys here was. " if you have to cut me out of the wreckage with the jaws of life, make damn sure you don't scratch the paint job"..
.....
....
.
Geico had a great point too... Always do a 180 /360 when at the run up area and look for liquids..