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Last updated: 23 March 2019
Status:Preliminary - official
Date:Tuesday 13 September 2016
Type:Silhouette image of generic B733 model; specific model in this crash may look slightly different
Boeing 737-347 (SF)
Operator:Trigana Air Service
Registration: PK-YSY
C/n / msn: 23597/1287
First flight: 1986-09-24 (30 years)
Total airframe hrs:59420
Engines: 2 CFMI CFM56-3B1
Crew:Fatalities: 0 / Occupants: 2
Passengers:Fatalities: 0 / Occupants: 1
Total:Fatalities: 0 / Occupants: 3
Aircraft damage: Substantial
Aircraft fate: Written off (damaged beyond repair)
Location:Wamena Airport (WMX) (   Indonesia)
Phase: Landing (LDG)
Departure airport:Jayapura-Sentani Airport (DJJ/WAJJ), Indonesia
Destination airport:Wamena Airport (WMX/WAJW), Indonesia
A Boeing 737-300 cargo plane operated by Trigana Air Service as flight TGN7321 sustained substantial damage in a landing accident on runway 15 at Wamena, Papua, Indonesia.
TGN7321 was a scheduled cargo flight from Jayapura-Sentani Airport to Wamena Airport. On board the aircraft were two pilots and one Flight Operation Officer (FOO) as a loadmaster. The aircraft carried 14,913 kg of cargo.
The aircraft cruised at an altitude of 18,000 feet and prior to descent, the pilot observed that the Visual Meteorological Conditions (VMC) existed. The pilots able to identify the other Trigana flight from Sentani to Wamena in front of them.
The aircraft made an orbit at X-POINT which located at 8 NM from runway 15 in order to allow a preceding flight to land.
At approximately 7,000 feet altitude, the pilot received landing clearance from the Wamena Tower controller. At this position, the pilot could not identify his visual checkpoints and decided to reduce the rate of descent and continued the approach.
At approximately 5,700 feet altitude at about 2 NM from the runway threshold, the pilot was able to see the runway and increased the rate of descent. Just prior to touchdown the aircraft rolled left 28° and pitched down 11°, before returning to approximately wings level and +7° pitch. The aircraft then touched down with a vertical acceleration of 3.25 g.
Both main landings gear subsequently collapsed and the left main landing gear completely detached during landing. The aircraft stopped at approximately 1,890 meters from the beginning of runway 15.

This was the second Boeing 737-300F landing accident at Wamena in just over a year. On August 28, 2015, a Cardig Air aircraft touched down about 35 meters before the beginning of runway 15, causing the left hand main gear to collapse.

Accident investigation:
Investigating agency: NTSC Indonesia
Status: Investigation ongoing
Duration: 86 days (3 months)
Accident number: KNKT.
Download report: Preliminary report


» Cardig Air flight 8F189 accident at Wamena, August 2015


photo of Boeing 737-347 (SF) PK-YSY
photo of Boeing 737-347 (SF) PK-YSY
photo of Boeing 737-347 (SF) PK-YSY
photo of Boeing 737-347 (SF) PK-YSY
photo of Boeing 737-347 (SF) PK-YSY
photo of Boeing 737-347 (SF) PK-YSY
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photo of Boeing 737-347 (SF) PK-YSY
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Aircraft history
date registration operator remarks
24 Sep. 1986 N311WA Boeing first flight
16 Oct. 1986 N311WA Western Airlines delivered
1 April 1987 N311WA Delta Air Lines Western merged with Delta
4 Jan. 1998 N311WA Delta Air Lines bird strike near Salt Lake City Airport No.1 engine damaged, 10 fan blades replaced
24 Feb. 2004 N311WA Delta Air Lines left nose wheel axle broke off during taxi at Salt Lake City Airport due to pre-existing crack
10 Jun. 2005 N311WA Delta Air Lines multiple bird strike to nose and no. 2 engine near Salt Lake City Airport at 8000 ft
2008 PK-BBA converted to Special Freighter (SF)
8 Oct. 2008 PK-BBA Cardig Air delivered
26 Sep. 2011 PK-YSY Trigana Air Service

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 Wamena Airport as the crow flies is 241 km (151 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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Boeing 737-300

  • 1113 built
  • 32nd loss
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