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Accident description
Last updated: 21 August 2017
Status:Preliminary - official
Date:Sunday 16 August 2015
Time:14:55
Type:Silhouette image of generic AT43 model; specific model in this crash may look slightly different
ATR 42-300
Operator:Trigana Air Service
Registration: PK-YRN
C/n / msn: 102
First flight: 1988-05-28 (27 years 3 months)
Total airframe hrs:50133
Cycles:55663
Engines: 2 Pratt & Whitney Canada PW120
Crew:Fatalities: 5 / Occupants: 5
Passengers:Fatalities: 49 / Occupants: 49
Total:Fatalities: 54 / Occupants: 54
Airplane damage: Destroyed
Airplane fate: Written off (damaged beyond repair)
Location:16,7 km (10.4 mls) NW of Oksibil Airport (OKL) (   Indonesia)
Crash site elevation: 2530 m (8301 feet) amsl
Phase: En route (ENR)
Nature:Domestic Scheduled Passenger
Departure airport:Jayapura-Sentani Airport (DJJ/WAJJ), Indonesia
Destination airport:Oksibil Airport (OKL/WAJO), Indonesia
Flightnumber:IL257
Narrative:
The ATR-42 departed Jayapura at 14:22 LT (05:22 UTC) and was expected to arrive at Oksibil at 15:04 LT (06:04 UTC).
At 14:55 the pilot made first contact with Oksibil Aerodrome Flight Information Services (AFIS), reporting cruising at 11500 feet over position Ambisibil. The AFIS controller acknowledged the message and instructed the pilot to report when overhead the airport. The pilot reported that they intended to fly a direct left base leg for runway 11. The Oksibil AFIS officer then told the pilot to continue approach and to call when position on final for runway 11.
There was no further contact with the flight.
The aircraft wreckage was found the next day on a ridge of Tanggo Mountain at approximately 8,300 feet AMSL, about 17 km from the airport.

Accident investigation:
cover
Investigating agency: NTSC Indonesia
Status: Investigation ongoing
Duration: 48 days (2 months)
Accident number: KNKT.15.08.17.04
Download report: Preliminary report

Classification:
Controlled Flight Into Terrain (CFIT) - Mountain

Sources:
» BASARNAS


Follow-up / safety actions

NTSC issued 3 Safety Recommendations

Show all AD's and Safety Recommendations

Photos

photo of ATR 42-300 PK-YRN
photo of ATR 42-300 PK-YRN
photo of ATR 42-300 PK-YRN
final flight path
photo of ATR 42-300 PK-YRN
Trigana's circling approach procedure for runway 11
photo of ATR 42-300 PK-YRN
photo of ATR 42-300 PK-YRN
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Aircraft history
date registration operator remarks
28 May 1988 F-WWEZ ATR first flight
22 August 1988 F-GFTO ATR new registration
29 September 1988 N421TE Resort Air bought
1 October 1989 N421TE Trans States Airlines transferred
13 December 1990 N421TE Trans States Airlines Incident: Blew 2 tyres after swerving on landing Madison, WI. Cause: Steering differential valve defective.
16 Jun 1997 N421TE Trans States Airlines Incident: Evacuated following left engine fire warning during taxi At St. Louis, MO. Warning was false. Cause: Bleedair duct leak.
8 August 1999 N421TE Trans States Airlines Incident: Diverted to Springfield, IL after left engine was shut down due to "low oil pressure" warning.
23 July 2000 N421TE Trans States Airlines Incident: Emergency landing due to flight control difficulty while in cruise flight. Cause: Failure of aileron trim switch due to foreign material contamination.
5 February 2003 N421TE Trans States Airlines Incident: Emergency diversion to Bloomington, IL after crew saw and smelled smoke.
23 February 2003 N421TE Trans States Airlines Incident: Nose gear axle broke; right wheel separated during taxi at St. Louis, MO.
21 January 2005 PK-YRN Trigana Air Service bought

Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Jayapura-Sentani Airport to Oksibil Airport as the crow flies is 258 km (161 miles).
Accident location: Exact; as reported in the official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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ATR-42

  • 422+ built
  • 31st loss
  • 9th fatal accident
  • The worst accident
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 Indonesia
  • 14th worst accident
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