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Accident
Last updated: 11 December 2017
Statuts:Enquête Officielle
Date:dimanche 7 octobre 2007
Heure:19:59
Type/Sous-type:Silhouette image of generic C208 model; specific model in this crash may look slightly different
Cessna 208B Grand Caravan
Compagnie:Kapowsin Air Sports
Immatriculation: N430A
Numéro de série: 208B-0415
Année de Fabrication: 1994
Heures de vol:9604
Moteurs: 1 Pratt & Whitney Canada PT6A-114A
Equipage:victimes: 1 / à bord: 1
Passagers:victimes: 9 / à bord: 9
Total:victimes: 10 / à bord: 10
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:ca 55 km WSW of Naches, WA (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Parachutage
Aéroport de départ:Star-Snake River Skydiving Airport, ID, Etats-Unis d'Amérique
Aéroport de destination:Shelton-Sanderson Field, WA (SHN/KSHN), Etats-Unis d'Amérique
Détails:
A Cessna 208B, N430A, was destroyed when it collided with terrain near Naches, Washington. The commercial pilot and nine passengers were killed.
The pilot was returning a group of skydivers to their home base after a weekend of skydiving. He flew several jump flights, and then stopped early in the afternoon to prepare the airplane for the flight home. The flight was planned into an area of clouds, turbulence, and icing, which the pilot had researched. He delayed the departure until he decided that he could complete the planned flight under visual flight rules (VFR). The flight departed Star (ID92), Idaho, about 1750 PDT, en route to Shelton (SHN), Washington. The accident occurred at night with little illumination of the moon, and the airplane was in an area of layered clouds. A detailed analysis of the weather conditions revealed that the flight probably encountered broken to overcast layers both below and above its flight altitude. The satellite and sounding images suggested that it was possibly in an area of mountain wave conditions, which can enhance icing. The recorded radar data indicated that the pilot was likely maneuvering to go around, above, or below rain showers or clouds while attempting to maintain VFR. The airplane likely entered clouds during the last 3 minutes of flight, and possibly icing and turbulence. It was turning when it departed from controlled flight, with the angle-of-attack increasing rapidly. The unpressurized airplane was flying at over 14,000 feet mean sea level for more than 1 hour during the flight. It reached 15,000 feet just prior to the accident in sequential 360-degree turns while climbing and descending. Supplemental oxygen was not being used. At these altitudes, the pilot would be substantially impaired by hypoxia, but would have virtually no subjective symptoms, and would likely be unaware of his impairment. The pilot had logged over 2,000 hours of total flight time, with nearly 300 hours in this make and model of airplane. He was instrument-rated, but had only logged a total of 2 hours of actual instrument flight time. Company policy was to fly under visual flight rules only, and they had not flight-checked the pilot for instrument flight.

Probable Cause:

PROBABLE CAUSE: "The pilot's failure to maintain an adequate airspeed to avoid an aerodynamic stall while maneuvering. Contributing to the accident were the pilot's impaired physiological state due to hypoxia, the pilot's inadequate preflight weather evaluation, and his attempted flight into areas of known adverse weather. Also contributing were the pilot's inadvertent flight into instrument meteorological conditions that included clouds, turbulence, and dark night conditions."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 9 months
Accident number: LAX08MA007
Download report: Summary report

Sources:
» Missing plane was carrying skydive group (KATU, 8-10-2007)
» FAA
» Wreckage of Missing Plane Found (Washington State DoT, 9-10-2007)
» NTSB


Photos

photo of Cessna 208B Grand Caravan N430A
photo of Cessna 208B Grand Caravan N430A
photo of Cessna 208B Grand Caravan N430A
Composite radar ground trackt of Cessna 208 N430A
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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 Star-Snake River Skydiving Airport, ID et Shelton-Sanderson Field, WA est de 642 km (401 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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