1. Place man, empty AH-99, empty UH-80 or other helicopter on map
2. Enter AH-99 as driver
3. Fly straight up
4. Tilt helicopter down to move forward (by moving mouse down or pressing W)
5. Observe the artificial horizon line --W-- move UP (see screenshot, top part)
6. Land and enter UH-80 as driver
7. Fly straight up
8. Tilt helicopter down to move forward (by moving mouse down or pressing W)
9. Observe the artificial horizon line --W-- move DOWN (see screenshot, bottom part)