The description should be enough, but should you find yourself to destroy either the tail or main rotor of a helicopter and later have the helicopter blow up, the tail or main rotor will still be in the destroyed model of the helicopter.
- Legacy ID
- Advanced Flight Model
1: Damage a helicopter's rotor to the point where it's gone
2: Blow the helicopter up
You are surely talking about every helicopter except for the MH-9/AH-9 and the Mohawk.
The most obvious ones with this case are the Ghosthawk and the Blackfoot. (Which really need reworking)