What happened
On 19 February 2015, a Robinson R44 helicopter, registration ZK-IPY, was performing a training flight near the Lochy River when it experienced a mid-air breakup. The aircraft was returning to Queenstown at the time of the incident. The crash, which occurred in dense bush, resulted in two fatalities, involving both the instructor and the student on board.
The investigation
The Transport Accident Investigation Commission (TAIC) initially investigated the accident, noting that the aircraft had suffered a mast bump—an event where the rotor hub or blade contacts the main rotor shaft. While the investigation established that the weather was suitable and no mechanical defects were present, the specific cause of the mast bump remained undetermined.
Following new information provided by the Coroner in 2016 regarding the instructor's mental health history, the Commission resumed its inquiry. Investigators reviewed medical records and consulted psychiatric experts to determine if any health factors contributed to the flight's outcome. The review focused on the instructor's treatment for depression and anxiety in 2014.
Findings
After a thorough review of the medical evidence, the Commission concluded that it was highly unlikely that any medical factor contributed to the accident. Expert analysis suggested the instructor's condition had likely remitted and that he was medically fit to fly at the time of the crash. The investigation found that the student pilot was likely the one operating the controls when the mast bump occurred.
Safety action
Despite finding no medical cause for this specific crash, the investigation identified significant systemic safety issues regarding the aviation medical certification process. The Commission noted that the current system allows for the potential circumvention of medical standards and that many medical practitioners are unaware of their legal duty to report health changes in pilots to the Civil Aviation Authority.
To address these risks, the Commission recommended that the Director of Civil Aviation review the medical application process to make it more robust. Additionally, recommendations were made to the Ministry of Health to consider integrating occupational data into the national electronic health record database to better monitor health risks in safety-critical roles.