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Accident
Last updated: 20 October 2017
Statuts:Enquête Officielle
Date:lundi 3 décembre 2012
Heure:10:50
Type/Sous-type:Silhouette image of generic C208 model; specific model in this crash may look slightly different
Cessna 208B Grand Caravan
Compagnie:Era Alaska
Immatriculation: N169LJ
Numéro de série: 208B-0599
Année de Fabrication: 1997
Heures de vol:11516
Moteurs: 1 Pratt & Whitney Canada PT6A-114A
Equipage:victimes: 0 / à bord: 2
Passagers:victimes: 0 / à bord: 7
Total:victimes: 0 / à bord: 9
Dégats de l'appareil: Substantiels
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:5 km (3.1 milles) NE of Mekoryuk-Ellis Field, AK (MYU) (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Mekoryuk-Ellis Field, AK (MYU/PAMY), Etats-Unis d'Amérique
Aéroport de destination:Bethel Airport, AK (BET/PABE), Etats-Unis d'Amérique
Numéro de vol: 140
Détails:
A Cessna 208B airplane, N169LJ, sustained substantial damage during a forced landing shortly after takeoff from the Mekoryuk Airport, Alaska. Of the nine people aboard, the two pilots and six passengers were not injured, and one passenger sustained minor injuries. The airplane was being operated as Era Alaska Flight 140 to Bethel, Alaska.
The pilot-in-command (PIC) stated that the second-in-command (SIC) was the flying pilot for the flight to Bethel. He said that the takeoff and initial climb were normal, but shortly after passing 1,000 feet, the engine "coughed," started vibrating, and lost power. An attempt to restart the engine was not successful. The PIC assumed control of the airplane, and landed on a frozen bay approximately 5 miles northeast of the Mekoryuk Airport. Witnesses at the airport observed the airplane descending, and responded with snow machines, and all-terrain vehicles to transport the airplane's occupants back to Mekoryuk.
During the forced landing the airplane sustained substantial damage to the fuselage and right wing.

A postaccident engine examination, performed at the facilities of Pratt & Whitney Canada, St. Hubert, Quebec, Canada, and under the direction of a senior NTSB powerplants investigator, revealed that a blade on the first stage compressor rotor failed as a result of a fatigue fracture. The fatigue crack initiated from the leading edge area and then propagated towards the trailing edge, and at mid-chord, the blade released by tensile overload. The initiation of the fracture could not be determined because of secondary damage to the fracture surface.

Probable Cause:

PROBABLE CAUSE: "The total loss of engine power as a result of a fractured first-stage compressor blade due to fatigue cracking. The source of the fatigue crack could not be determined due to secondary damage sustained to the fracture surface"

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 2 months
Accident number: ANC13LA012
Download report: Summary report

Sources:
» NTSB


Photos

photo of Cessna 208B Grand Caravan N169LJ
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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 Mekoryuk-Ellis Field, AK et Bethel Airport, AK est de 244 km (153 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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