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Last updated: 19 September 2019
Statuts:Enquête Officielle
Date:mercredi 12 avril 2017
Heure:ca 12:40
Type/Sous-type:Silhouette image of generic C208 model; specific model in this crash may look slightly different
Cessna 208 Caravan I
Compagnie:Spirit Avia Sentosa
Immatriculation: PK-FSO
Numéro de série: 20800313
Année de Fabrication: 1991
Heures de vol:6226
Cycles:8668
Moteurs: 1 Pratt & Whitney Canada PT6A-114A
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:13 km (8.1 milles) N of Oksibil Airport (OKL) (   Indonésie)
Élévation des lieux de l'accident: 2160 m (7087 feet) amsl
Phase de vol: En vol (ENR)
Nature:Cargo
Aéroport de départ:Tanahmerah Airport (TMH/WAKT), Indonésie
Aéroport de destination:Oksibil Airport (OKL/WAJO), Indonésie
Détails:
The Cessna 208 aircraft registered PK-FSO, was being operated on an unscheduled cargo flight from Tanahmerah Airport to Oksibil Airport in Papua, Indonesia. On board the aircraft was one pilot, 1,225 kg of general cargo and 800 lbs of fuel.
At 11:44 hours local time, in daylight conditions, the aircraft departed Tanahmerah and cruised at altitude of 7,000 feet. Estimate time arrival at Oksibil would be 12:24.
At 12:12, when the aircraft position was about 45 NM north of Tanahmerah, the aircraft passed another Cessna 208B aircraft from the opposite direction from Oksibil to Tanahmerah. The Cessna 208B pilot advised to the pilot via radio that the PK-FSO aircraft was in sight. The pilot responded that the aircraft was maintaining 7,000 feet on direct route to Oksibil.
The pilot failed to contact the Oksibil air traffic controller and failed to arrive at the destination. The airline's flight following officer received an emergency signal with a last recorded position of 6 NM north of Oksibil.
The next day the aircraft was found on a ridge of Anem Mountain at a height of 7100 feet. The aircraft was destroyed by impact forces and the pilot was fatally injured.

The investigation learned that two days prior the occurrence, the pilot travelled on a night commercial flight. This might have resulted in a sleep disturbance during the window of circadian low and an increase of the potential of fatigue. There are indications that the pilot did not have the required adequate restorative sleep before he started flying on the accident day. Prior to the occurrence flight, the pilot had flown for 3 flight sectors, with total flight hour of 2 hours 55 minutes. The multiple take-offs and landings that day increased fatigue.
Based on the final flight track, the absence of voice communication, the weather condition permitting the pilot to identify the airport location and the aircraft wreckage, consistently indicated that there were no pilot activities to fly the aircraft after the last known pilot activities at about 29 Nm from Oksibil until impact.
Colleagues of the pilot reported that he often smoked in the cockpit during the flight, looked sleepy and engaged the Terrain Inhibit switch which disabled the GA-EGPWS function while flying. This prevented any prior warning when the aircraft neared Anem Mountain.
This known behavior was not reported to the Operation and Safety department, so no action could be taken.

Probable Cause:

Contributing Factors: "The possibility of the pilot being fatigue, physical and environment condition increased pilot sleepiness which might have made the pilot inadvertently falling asleep indicated by no pilot activity. The absence of GA-EGPWS aural alert and warning was unable to wake up the pilot."

Accident investigation:
cover
Investigating agency: NTSC Indonesia
Status: Investigation completed
Duration: 2 years and 5 months
Accident number: KNKT.17.04.10.04
Download report: Final report


Opérations de secours

NTSC issued 6 Safety Recommendations

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Photos

photo of Cessna-208-Caravan-I-PK-FSO
accident date: 12-04-2017
type: Cessna 208 Caravan I
registration: PK-FSO
photo of Cessna-208-Caravan-I-PK-FSO
 

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 Tanahmerah Airport et Oksibil Airport est de 136 km (85 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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