2016-09-13 Trigana Boeing 737F gear collapse on landing at Wamena
On landing at Wamena Airport, the 737 suffered a main gear collapse after an extremely hard landing. Both crewmembers remained unhurt. The 737 is a hull loss.
Indonesian NTSC published a Preliminary Report -> [LINK](pdf)
According to factual information gathered during the investigation, the findings were listed as follows:
- The aircraft was airworthy prior to the occurrence and was operated within the weight and balance envelope. There was no report or record of the aircraft system abnormality during the flight from take-off until the time of the occurrence.
- All crew had valid licenses and medical certificates.
- Fifteen minutes before departure, the pilot received weather information of Wamena which was stated that on the right base runway 15, low cloud was observed with the cloud base was increasing from 200 to 1000 feet and the visibility was 3 km.
- The visibility of Wamena airport reported by BMKG at the time of the occurrence was 3 km.
- At altitude approximately 7,000 feet, the pilot received landing clearance from the Wamena tower controller, at this position, the pilot could not identify visual checkpoint. The PF reduced the rate of descend and continued the approach. The PM advised to go around.
- At altitude approximately 5,700 feet at about 2 Nm from runway threshold the PF was able to see the runway and increased the rate of descend. The Enhanced Ground Proximity Warning System (EGPWS) aural warning “SINK RATE” active and the PF reduced the rate of descent.
- While the aircraft passing threshold, the aircraft sunk and touched down at approximately 125 meter from the beginning runway 15. The FDR recorded the vertical acceleration was 3.25 g on touchdown.
- Both of main landings gear collapsed. The left main landing gear detached and found on runway. The engine and lower fuselage contacted to the runway surface. The aircraft veer to the right and stopped at approximately 1,890 meters from the beginning of the runway 15.
Trigana Air cargo flight 7341 from Jayapura was on short final approaching runway 15 in obscured skies and low clouds, when the pilots apparently realized they were not aligned with the runway centreline. In an attempt to achieve a successful landing, aircraft banked to the right. Simultaneously the nose was pushed down in an attempt a landing within the first 3rd of the runway.
At this time the aircraft delevoped an increased rate-of-descend. Despite pulling up the nose again, the maingears touched down very hard on the runway causing the left maingear to separate and it struck the fuselage causing substantial damage. Subsequently the right maingear collapsed resulting in a belly landing. The 737 skidded on its aft fuselage, both engines and its (undamaged) nosegear down the runway until about 1,500 meters when it drifted slightly off the right side coming to rest halfway on the grass.
Both pilots and one technician were on board. All remained uninjured.
Considering the aircraft age (30 y) and the extent of damage it is highly likely that the 737 will not be repaired again. The airport was closed for all traffic.
The cargo consisted of about 15 tons of diesel fuel, rice and sugar. Wamena is situated in very remote region. Many supplies to maintain an everyday life had to be brought in via air.
Wamena Airport is not equipped with an intrument approach. The pilots must get visual contact in time, to make a safe landing if this is not the case the approach must be discontinued.
According to an eye-witness the aircraft braked out of cloud vary late, at around 150 – 200 feet above ground, at this altitude there is hardly any time for pilots to make heading or altitude corrections.
Minutes before another Trigana Boeing 737 sucessfully landed at Wamena.
There are no weather information available from Wamena Airport. The only available runway at Wamena (15 / 33) is 1829 meters in lengh.
Touchdown skidmarks of PK-YSY
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Aerial Map (provided by GoogleEarth)
Type: Boeing 737-300F
Age a/c: 30,0 years
Constr. No.: 23597
Previous Owners: Western Airlines 1986, Delta Air Lines 1987, Cargig Air Cargo 2008, Trigana Air 2011
Occupants & Casualties
Date: 2016-09-13 Time: 07:33
Location: WAJW WMX Wamena
Flight phase: LDG – Flare, Landing Roll, Aborted Landing after Touchdown
Damage to a/c: damaged beyond repair
Flight no.: IL 7341
From: WAJJ/DJJ: Jayapura Sentani Intl Airport To: WAJW/WMX: Wamena
Operator: Trigana Air Service
JACDEC 25-year Statistics :
- 20th safety occurence for the operator
- 230th safety occurence of type (B737-300)
- 15th safety occurence at Wamena Airport
- 1st safety occurence for aircraft in question
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