In the past, the marking rules on a flight test in essence were the following:
- "4" is good
- "3" - minor mistakes
- "2" - major mistakes, going outside tolerances, but correcting in a timely manner
- "1" - critical mistakes, going outside tolerances without correcting, exceeding twice the tolerances
- Outcome of the flight test: as long as you don't get any ones, it's a pass. More or less.