Introduction
The Komite Nasional Keselamatan Transportasi (KNKT) published the final accident investigation report (KNKT.15.03.08.04) for the helicopter accident involving Sikorsky S-76C+ registration PK-FUP. The accident occurred on 21 March 2015 at Delta Mahakam River, East Kalimantan, Indonesia. The operator was PT. Hevilift Aviation Indonesia.
Factual Information
The report's factual information includes the history of the flight, injuries to persons, damage to the helicopter, personnel information (pilot in command and second in command), helicopter information (general, engines including Turbomeca Arriel 2S1, main rotor blade, tail rotor, flight control system), meteorological information, aids to navigation, communications, aerodrome information, flight recorders (FDR and CVR), wreckage and impact information, medical and pathological information, fire, survival aspects, tests and research (push rod examination, servo actuator examination, video recording), organizational and management information, additional information (similar accident in Nigeria, Sikorsky Alert Service Bulletin 76-67-57, Airworthiness Directive, and maintenance manual revision), and useful investigation techniques.
Analysis and Conclusions
The analysis section is followed by conclusions which include findings and contributing factors. The report also documents safety actions taken by Hevilift and Sikorsky, and issues safety recommendations.
Additional References
The investigation referenced a similar accident in Nigeria and considered Sikorsky Alert Service Bulletin (ASB) 76-67-57, related Airworthiness Directives, and revisions to the Sikorsky Aircraft Maintenance Manual.