Family members of four aviators killed in an army helicopter crash during a training exercise have lodged a class action against the Commonwealth and helicopter manufacturer Airbus. Captain Lyon was piloting the helicopter while flying in a four-chopper formation, before rolling the aircraft to the right and diverting it from a potential collision with another aircraft, which had the call sign Bushman 82. Advertisement AdvertisementAdvertisement AdvertisementAn investigation by the Defence Flight Safety Bureau (DFSB) investigation ultimately concluded spatial disorientation was the primary cause of the crash by Captain Lyon and his co-pilot, Lieutenant Nugent. Caitland Lyon, the widow of Captain Lyon, is listed as the lead applicant. Caitland Lyon, the widow of Captain Lyon, is listed as the lead applicant.