On 16 August 2015, the ATR 42 turboprop operating the service crashed on approach in the Bintang highlands region of Oksibil, killing all 49 passengers and 5 crew members.

[7] The Indonesian National Transportation Safety Committee published its final report into the accident in December 2017.

[9] The aircraft involved, manufactured in 1988, was an ATR 42-300 registered as PK-YRN with serial number 102 and was powered by two Pratt & Whitney Canada PW120 engines.

Aircraft operated by Trigana Air were involved in fourteen accidents between 1992 and 2016, eleven of which resulted in hull loss.

[13] Three local government officials and two members of the Regional Representatives Council were also on board to attend celebrations in Oksibil for the 70th anniversary of Indonesia's independence.

[14][15] The Trigana Air flight took off from Sentani Airport in Jayapura at 14:22 WIT (UTC+9, 05:22 UTC) and was expected to land in Oksibil at about 15:04.

Data from the local Indonesian Agency for Meteorology, Climatology and Geophysics office showed that the weather at the time of the crash was sunny.

[27][28] The Ministry of Transportation acknowledged that Indonesia's air navigation system equipment was very old, dating back to the 1950s, especially in remote areas such as Papua.

[30][31][32] Local residents contacted police and reported that they saw the aircraft crash into the Tangok Mountain in the Okbape district of Pegunungan Bintang Regency.

[39] Photos taken from the crash site reveal that the aircraft had been heavily fragmented into smaller pieces by the force of the impact with no chance of survival.

[42] The Indonesian National Transportation Safety Committee (NTSC or KNKT) opened an investigation to the crash.

In line with international regulations, as the aircraft was built in France, its Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile (BEA) participated, sending three investigators.

[46] The flight data recorder (FDR) had a history of maintenance problems going back more than a year, and was inoperative at the time of the accident.

[failed verification] According to the NTSC, based on the CVR analysis, Flight 267 descended while in the clouds, while the mountains were covered in fog.

Due to their previous success on landing an aircraft prior to the accident (by flying below the minimum safe altitude), the crew may have believed that they would be able to conduct a similar maneuver without adverse consequences.

Investigators discovered that the circuit breaker responsible for the activation of the EGPWS had intentionally been pulled by Flight 267's crew.

Trigana Air's management stated that some pilots claimed the warnings sometimes sounded improperly, which led them to believe that the EGPWS had malfunctioned.

[8]: 45 As per the final report, the investigation concluded that the EGPWS power supply circuit breaker was pulled during the accident flight and the two previous flights, explaining the absence of the altitude call out during the two previous approaches and warning prior to the impact.

Further investigation revealed that Trigana Air's published approach chart which it provided the pilot had incorrect information.

Minister of Transportation Ignasius Jonan commented that Trigana Air "must treat the affected families as well as possible".

Shortly after the crash, flowers and condolence banners were displayed in front of Trigana Air's head office.

Arnold Barnet, a statistician focusing on aviation safety at the Massachusetts Institute of Technology, told the New York Times in December 2014 that the death rate in Indonesian airline crashes over the previous ten years was one in every million passenger-boardings, compared to one death for every 25 million passengers for airlines in the United States.

According to CNN, International Air Transport Association (IATA) CEO Tony Tyler said in March 2015 that Indonesia had seen at least one major crash resulting in the loss of an aircraft every year since 2010; and that Indonesia was rated "below the global average" by the Universal Safety Oversight Audit Program (USOAP) of the International Civil Aviation Organization (ICAO).