I can confirm that a person with at least 2.1 Mechanic skill was able to install engine to 9% (he was able to see repair percentage) and the heli was able to start... so yes, it was a skill problem.

I had flying BH with red ENG (but flying). Recently I've hit some tree, the engine immediatelly stopped but I was able to safely land. However even when I have replaced every part in the heli, the engine just won't start when pressing Q. Anyone have any idea? With just a basic skill I am able to rep...