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Statuts:Enquête Officielle
Date:dimanche 9 novembre 1997
Type/Sous-type:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different
de Havilland Canada DHC-6 Twin Otter 300
Compagnie:Royal Australian Army
Immatriculation: VH-HPY
Numéro de série: 706
Année de Fabrication: 1980
Heures de vol:18208
Moteurs: 2 Pratt & Whitney Canada PT6A-27
Equipage:victimes: 0 / à bord: 4
Passagers:victimes: 0 / à bord: 0
Total:victimes: 0 / à bord: 4
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:9 km (5.6 milles) SW of Simbai (   Papouasie Nouvelle-Guinée)
Phase de vol: En vol (ENR)
Nature:Militaire
Aéroport de départ:Koinambe Airport (KMB), Papouasie Nouvelle-Guinée
Aéroport de destination:Simbai Airport, Papouasie Nouvelle-Guinée
Détails:
On the third day of flying operations in Papua New Guinea, the crew of the Darwin-based Twin Otter were conducting a flight from Madang and return via a number of airstrips in the central highlands. When haze and cloud prevented them flying the flight-planned direct track between the Koinambe and Simbai airstrips, they decided to fly north-west via the Jimi River valley and one of its tributaries. Two of the trainees were occupying the cockpit seats, one as flying pilot and the other as navigating pilot using a 1:1,000,000-scale chart. When the crew turned the aircraft to follow a tributary off the Jimi River, the training pilot was in the aircraft cabin. A few minutes later, their discussion regarding the progress of the flight attracted the attention of the training pilot. By this time, however, the position of the aircraft in the valley, and its available performance, were such that an escape from the valley was not possible. The aircraft collided with trees before impacting steeply sloping ground.

Probable Cause:

SIGNIFICANT FACTORS:
1. There had been a significant loss of corporate knowledge, experience and risk appreciation within the Army concerning the operation of Twin Otter type aircraft in tropical mountainous areas.
2. No training needs analysis for the exercise had been conducted.
3. The tasking and briefing of the training pilot were incomplete.
4. The training pilot did not adequately assess the skill development needs of the trainees.
5. The supervision of the flight by the training pilot was inadequate.
6. The scale of chart used by the crew was not appropriate for the route they intended to fly.

Accident investigation:
cover
Investigating agency: BASI
Status: Investigation completed
Duration: 1 year and 9 months
Accident number: BASI report 9703719
Download report: Final report
Language: English


Opérations de secours

ATSB issued 5 Safety Recommendations

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Plan
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 Koinambe Airport et Simbai Airport est de 24 km (15 miles).

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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