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Accident
Last updated: 14 December 2017
Statuts:Enquête Officielle
Date:mardi 15 septembre 2009
Heure:14:35
Type/Sous-type:Silhouette image of generic C208 model; specific model in this crash may look slightly different
Cessna 208 Caravan I
Compagnie:North American Flight Services
Immatriculation: N336DN
Numéro de série: 208-00001
Année de Fabrication: 1985
Heures de vol:10182
Moteurs: 1 Pratt & Whitney Canada PT6A-114A
Equipage:victimes: 0 / à bord: 1
Passagers:victimes: 0 / à bord: 5
Total:victimes: 0 / à bord: 6
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Sheffield, MA (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Charter National
Aéroport de départ:Farmingdale-Republic Field, NY (FRG/KFRG), Etats-Unis d'Amérique
Aéroport de destination:Saratoga Springs-Saratoga County Airport, NY, Etats-Unis d'Amérique
Détails:
A Cessna 208, N336DN, operated by North American Flight Services Inc., experienced a loss of engine power while climbing and performed a forced landing in Sheffield, MA. The airplane was destroyed by a post crash fire and the commercial-rated pilot and 5 passengers were not injured. Visual meteorological conditions prevailed and an instrument flight rules flight plan was filed for the flight that departed Farmingdale-Republic Field, NY (FRG), destined for the Saratoga Springs-Saratoga County Airport, NY. The five passengers were employees of an industrial services company. The flight transported blasting caps and ammonium nitrate used for blasting operations, which were stored in a metal box inside the airplane.
The pilot reported that the airplane departed FRG at 1405, and he initiated a climb to 9,000 feet without any abnormalities. As the airplane was climbing, and at an altitude of about 8,500 feet, the pilot heard two "whooshing" sounds, about 5 seconds apart. The engine then began to experience torque fluctuations. Shortly thereafter, the engine torque dropped to idle, and the pilot heard a "loud bang" and felt a "burst vibration."
The pilot declared an emergency to air traffic control and was told that the closest airport was located about 10 miles north, in Great Barrington, Massachusetts. The pilot informed air traffic control that the airplane would not be able to reach Great Barrington, and he subsequently performed a forced landing to a field.
During the landing, the airplane's right wing struck a tree and separated. All occupants exited the airplane without injury; however, the airplane became fully engulfed in fire, which consumed the majority of the airplane.
This Cessna 208 was the first production Caravan.

Probable Cause:

PROBABLE CAUSE: "A total loss of engine power due to a failure of the 1st stage sun gear output splines for unknown reasons, which resulted in a power turbine overspeed condition, with subsequent blade distress/release."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 4 months
Accident number: ERA09LA523
Download report: Summary report

Sources:
» Saratoga-bound plane crashed in Berkshires (15-9-2009, The Saratogian)
» NTSB Identification: ERA09LA523


Photos

photo of Cessna 208 Caravan I N336DN
photo of Cessna 208 Caravan I N336DN
photo of Cessna 208 Caravan I N336DN
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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 Farmingdale-Republic Field, NY et Saratoga Springs-Saratoga County Airport, NY est de 259 km (162 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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