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Last updated: 1 August 2021
Statuts:Enquête Officielle
Date:samedi 23 décembre 2017
Type/Sous-type:Silhouette image of generic BN2P model; specific model in this crash may look slightly different
Britten-Norman BN-2A Islander
Compagnie:North Coast Aviation
Immatriculation: P2-ISM
Numéro de série: 227
Année de Fabrication: 1970-11-13 (47 years 2 months)
Heures de vol:32232
Moteurs: 2 Lycoming IO-540-K1B5
Equipage:victimes: 1 / à bord: 1
Passagers:victimes: 0 / à bord: 0
Total:victimes: 1 / à bord: 1
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:11,3 km (7.1 milles) S of Dinangat Village (   Papouasie Nouvelle-Guinée)
Élévation des lieux de l'accident: 2900 m (9514 feet) amsl
Phase de vol: En vol (ENR)
Aéroport de départ:Derim Airport (DER/AYDE), Papouasie Nouvelle-Guinée
Aéroport de destination:Lae-Nadzab Airport (LAE/AYNZ), Papouasie Nouvelle-Guinée
A BN-2A Islander aircraft, registered P2-ISM, owned and operated by North Coast Aviation, impacted a ridge, at about 9,500 ft, that runs down towards the Sapmanga Valley from the Sarawaget Ranges, Morobe Province in Papua New Guinea. The pilot elected to track across the Sarawaget ranges, from Derim to Nadzab Airport, not above 10,000 ft. GPS recorded track data immediately prior to the last GPS fix showed that the aircraft was on a shallow descent towards the ridge at that time. The aircraft impacted the ridge about 150 metres beyond the last fix.
During the search for the aircraft, what appeared to be the right aileron was found hanging from a tree near the top of the heavily-timbered, densely-vegetated ridge. The remainder of the wreckage was found about 150 m from the aileron along the projected track. The aircraft impacted the ground in a steep nose-down, right wing-low attitude. The majority of the aircraft wreckage was contained at the ground impact point. The aircraft was destroyed by impact forces. The pilot, the sole occupant, initially survived. The pilot had made contact with one of the operator’s pilots at 16:15 on 23 December.
Bad weather in the area prevented a recovery until December 26. By that time the pilot had died of his injuries.

Probable Cause:

Causes [Contributing factors]:
Cloud build up along the pilot's chosen route may have forced him to manoeuvre closer than normal to the ridge, in order to avoid flying into the cloud.
The aircraft's right wing struck a tree protruding from the forest canopy during controlled flight into terrain. It is likely that the right aileron mass balance became snagged on the tree and rapidly dislodged the aileron from the wing. The loss of roll control, and the aerodynamic differential, forced the aircraft to descend steeply through the forest and impacted terrain.

Other factor
While not contributing to this accident, the lack of appropriate and effective Search and Rescue capability, and the lack of a Rescue Coordination Centre established, maintained and operated in accordance with ICAO Annex 12 Standards, likely contributed to the delayed rescue.

Accident investigation:
Investigating agency: AIC PNG
Status: Investigation completed
Duration: 219 days (7 months)
Accident number: AIC 17-1004
Download report: Final report


Opérations de secours

PNG AIC issued 1 Safety Recommendation

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photo of BN-2A-Islander-P2-ISM
accident date: 23-12-2017
type: Britten-Norman BN-2A Islander
registration: P2-ISM
photo of BN-2A-Islander-P2-ISM
Aircraft track and wreckage location

Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Derim Airport et Lae-Nadzab Airport est de 63 km (39 miles).
Accident location: Exact; as reported in the official accident report.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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