Complacency, disconnected EGPWS led to Trigana ATR crash

The final report into the fatal crash of a Trigana Air ATR 42-300 in 2015 has highlighted crew, equipment, and organisational issues. The disaster occurred when the aircraft (PT-YRN) flew into Tanggo Mountain at an elevation of 8,300ft on 16 August 2015, killing all 49 passengers and five crew on board. The aircraft was operating a Sentani-Oksibil service in the Indonesian province of Papua, and Oksibil was experiencing cloudy conditions the day of the crash. In its final report, Indonesia's National Transportation Safety Committee (NTSC) highlighted two direct contributory factors: deviation from visual approach guidance and visual flight rules without regard to the weather and terrain; and the absence of enhanced ground proximity warning system alerts. A factor underlining both immediate causes was the safety culture at the airline. The report's findings were based purely on the cockpit voice recorder (CVR) as the flight data recorder was damaged in the crash and had a long and problematic maintenance history. Neither Indonesian nor French officials were able to glean useful data from the device. Complacency may have played a role in the crash. The crew had already conducted a service on the same route that day when they had flown directly to a base leg to runway 11. The CVR indicated that a similar approach was planned before the crash, although weather conditions had apparently deteriorated between the two flights.<br/>