Détails:
A de Havilland DHC-3T Turbine Otter airplane, experienced an anomalous in-flight vibration and uncommanded nose-down pitch during cruise flight in the vicinity of Homer, Alaska. The airplane sustained substantial damage to the right elevator. The flight departed Seldovia, Alaska, about 0900, en route to Anchorage, Alaska.
According to the pilot, during cruise flight, the airplane vibrated and subsequently pitched nose-down. The pilot applied corrections and continued the flight to the destination. After landing, the pilot and a mechanic examined the airplane and found that the skin on the right elevator servo tab was separated from the hinge, and spar structures inside the right elevator were cracked.
This same aircraft, N3125N, was involved in an accident on 4 June 2015, when during cruise flight, while applying back pressure to the control yoke, a vibration was felt. The pilot immediately reduced power and executed a precautionary landing. After landing it was found that the skin on the right elevator servo tab was fractured and separated from the hinge, and spar structures inside the right elevator were cracked.
PROBABLE CAUSE: "The flutter failure of the right elevator servo tab due to the improper fabrication of the servo tab and maintenance personnels subsequent failure to detect anomalies with the servo tab."
| Statuts: | Accident investigation report completed and information captured |
| Date: | vendredi 30 mai 2014 |
| Heure: | 09:30 |
| Type/Sous-type: |  de Havilland Canada DHC-3T Texas Turbine Otter |
| Compagnie: | Alaska Air Taxi |
| Immatriculation: | N3125N |
| Numéro de série: | 394 |
| Année de Fabrication: | 1960 |
| Moteurs: | 1 Garrett TPE331 |
| Equipage: | victimes: 0 / à bord: 1 |
| Passagers: | victimes: 0 / à bord: 2 |
| Total: | victimes: 0 / à bord: 3 |
| Dégats de l'appareil: | Mineurs |
| Conséquences: | Repaired |
| Lieu de l'accident: | près de Homer, AK ( Etats-Unis d'Amérique)
|
| Phase de vol: | En vol (ENR) |
| Nature: | Privé |
| Aéroport de départ: | Sedona Airport, AZ (SDX/KSEZ), Etats-Unis d'Amérique |
| Anchorage-Ted Stevens International Airport, AK (ANC/PANC), Etats-Unis d'Amérique |
A de Havilland DHC-3T Turbine Otter airplane, experienced an anomalous in-flight vibration and uncommanded nose-down pitch during cruise flight in the vicinity of Homer, Alaska. The airplane sustained substantial damage to the right elevator. The flight departed Seldovia, Alaska, about 0900, en route to Anchorage, Alaska.
According to the pilot, during cruise flight, the airplane vibrated and subsequently pitched nose-down. The pilot applied corrections and continued the flight to the destination. After landing, the pilot and a mechanic examined the airplane and found that the skin on the right elevator servo tab was separated from the hinge, and spar structures inside the right elevator were cracked.
This same aircraft, N3125N, was involved in an accident on 4 June 2015, when during cruise flight, while applying back pressure to the control yoke, a vibration was felt. The pilot immediately reduced power and executed a precautionary landing. After landing it was found that the skin on the right elevator servo tab was fractured and separated from the hinge, and spar structures inside the right elevator were cracked.
Probable Cause:
PROBABLE CAUSE: "The flutter failure of the right elevator servo tab due to the improper fabrication of the servo tab and maintenance personnels subsequent failure to detect anomalies with the servo tab."
Accident investigation:
 |
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Sources:
» NTSBPhotos
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 Sedona Airport, AZ et Anchorage-Ted Stevens International Airport, AK est de 3950 km (2468 miles).
La distance entre Sedona Airport, AZ et Anchorage-Ted Stevens International Airport, AK est de 3950 km (2468 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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