After I hit a tree with my rotor blades, they broke off. However, I was still able to gain a bit of altitude, and autorotate succesfully to the ground.
While this is not really a high priority bug/inconsistency, it does look a bit stupid. So if you have any time and energy left after fixing all the other bugs, please take a look at this inconsistency.
Furthermore: this is the only bug I have found so for, and that means this Alpha is less buggy for me than BF3 almost one and half years after release. ARMA 3 is an amazing game!