KRviator listed extracts from the ATSB preliminary report but not this sentence: "The carcass and samples taken from the helicopter’s main transmission cowling were identified as Aquila audax (commonly known as a wedge-tailed eagle)". I wonder if this is any indication that the eagle struck near the rotorhead? Not sure how blades cope with birdstrikes, but you would certainly have to wonder how a pitch control linkage would cope with such an impact. If it was bent, blade would experience sudden pitch increase.