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Last updated: 24 March 2019
Date:Saturday 20 September 2014
Type:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different
de Havilland Canada DHC-6 Twin Otter 300
Registration: P2-KSF
C/n / msn: 528
First flight: 1977-02-16 (37 years 8 months)
Total airframe hrs:34327
Engines: 2 Pratt & Whitney Canada PT6A-27
Crew:Fatalities: 2 / Occupants: 2
Passengers:Fatalities: 2 / Occupants: 7
Total:Fatalities: 4 / Occupants: 9
Aircraft damage: Destroyed
Aircraft fate: Written off (damaged beyond repair)
Location:12 km (7.5 mls) ENE of Port Moresby-Jacksons International Airport (POM) (   Papua New Guinea)
Crash site elevation: 488 m (1601 feet) amsl
Phase: En route (ENR)
Nature:Domestic Non Scheduled Passenger
Departure airport:Woitape Airport (WTP/AYWT), Papua New Guinea
Destination airport:Port Moresby-Jacksons International Airport (POM/AYPY), Papua New Guinea
A DHC-6 Twin Otter, registered P2-KSF, was destroyed when it impacted wooded terrain near the top of Mount Lawes, Papua New Guinea, in bad weather. Both pilots and two passengers sustained fatal injuries.
The aircraft was operated by Hevilift and conducted a charter flight from Woitape to Port Moresby, Papua New Guinea. It took off at 09:16 local time with the First Officer acting as Pilot Flying and the captain as Pilot Monitoring.
At 09:22, when approximately 67 km from Port Moresby at 8,000 ft, Flight Service cleared the aircraft to enter controlled airspace VFR and instructed the flight crew to contact Jacksons Radar at 56 km (30 DME).
At 09:25, the Pilot Monitoring called Jacksons Radar and reported that at 54 km (29 DME) from Port Moresby on the 177 radial at 8,000 ft. He stated that they were visual, and requested a clearance to descend. The radar controller cleared the flight to descend to 6,000 ft visual and to track to a left base position for runway 14 right. The Pilot in Command acknowledged this. The radar controller then instructed the crew to contact Jacksons Tower at 19 km (10 DME). At 09:37, the Pilot Monitoring called the tower controller and reported at 17.5 km (9.5 DME) from Jacksons Airport, descending below 4,000 ft AMSL, and stated: "we’re running into a bit of cloud, we might as well pick up the ILS if it’s OK". The tower controller replied immediately, but did not respond to the mention of the ILS; instead, she said "kilo sierra foxtrot roger, continue approach runway 14 right, report on [..] left base". The Pilot Monitoring responded by reading this back without further mention of the ILS. Shortly afterwards, the aircraft impacted terrain at approximately 1,600 ft AMSL on the northern side of Mount Lawes, just below the summit.
Initial review of the cockpit voice recording indicated that there were no aural warnings from the enhanced ground proximity warning system (EGPWS) and that the flight crew did not see the terrain until approximately one second before impact.

Probable Cause:

Causes [Contributing factors]:
a) The flight crew continued the descent in instrument meteorological conditions without confirming their position.
b) The flight crew’s assessment of their position was incorrect and they had lost situational awareness
c) The flight crew deprived themselves of the "Caution" and "Warning" alerts that would have sounded about 20 sec and about 10 sec respectively before the collision, by not deactivating the EGPWS Terrain Inhibit prior to departure from Woitape.

Accident investigation:
Investigating agency: AIC PNG
Status: Investigation completed
Duration: 11 months
Accident number: AIC 14-1005
Download report: Final report

Controlled Flight Into Terrain (CFIT) - Mountain

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photo of de Havilland Canada DHC-6 Twin Otter 300 P2-KSF
photo of de Havilland Canada DHC-6 Twin Otter 300 P2-KSF
photo of de Havilland Canada DHC-6 Twin Otter 300 P2-KSF
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Aircraft history
date registration operator remarks
16 February 1977 YV-31C de Havilland Canada first flight
28 May 1977 YV-31C LAV-Línea Aeropostal Venezolana delivered
January 1988 YV-531C Línea Turística Aereotuy bought
10 December 1993 N528SA Scott Aircraft Sales Inc. registered
11 February 1994 P2-HCF Hevilift registered
March 2005 P2-KSF Hevilift registered

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 Woitape Airport to Port Moresby-Jacksons International Airport as the crow flies is 98 km (61 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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