Factual Information
The accident involved a Bell 429 helicopter, registration PK-WSX, operated by PT Whitesky Aviation. The event occurred on 20 April 2018 in Morowali, Sulawesi Tengah, Indonesia. The investigation collected data from flight data recorder (FDR), cockpit voice recorder (CVR), health and usage monitoring systems (HUMS), and aircraft data memory module (ADMM). The wreckage examination focused on components such as the engine switch, throttle position, main rotor, tail rotor, and tail rotor drive shaft. The cockpit glareshield panel and display unit (DU) were also examined. Personnel and aircraft information were reviewed, along with meteorological conditions, communications, and helipad information.
Analysis
The analysis identified a failure of the Electronic Engine Control (EEC) on engine 1 as a key element. The tests and research were conducted by Bell and Pratt & Whitney on the wreckage, as well as on the data collection unit (DCU). The examination included the fuel control system and transmission assembly.
Conclusions
The conclusions section lists findings and contributing factors. The contributing factors are explicitly stated in the report and relate to the engine control system.
Safety Actions and Recommendations
The report includes safety actions taken by PT Whitesky Aviation and recommendations issued by the KNKT.