The current in-game MH-6/AH-6 is able to demonstrate a high degree of indestructibility around the Tail, Rotor and AT-Rotor. The Helicopter is able to survive impacts against soft collapsible objects, low speed impacts against non-collapsible objects and tail stands.
I have created a video that demonstrates the survivability. (Please excuse the dodgy third person flying, I normally stay with first-person.)