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Accident
Last updated: 12 December 2017
Statuts:Enquête Officielle
Date:vendredi 2 septembre 2011
Heure:13:35
Type/Sous-type:Silhouette image of generic C208 model; specific model in this crash may look slightly different
Cessna 208B Grand Caravan
Compagnie:Grant Aviation
Immatriculation: N207DR
Numéro de série: 208B-0859
Année de Fabrication: 2000
Heures de vol:8483
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:14 km (8.8 milles) N of Nightmute, AK (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Cargo
Aéroport de départ:Toksook Bay Airport, AK (OOK/PAOO), Etats-Unis d'Amérique
Aéroport de destination:Bethel Airport, AK (BET/PABE), Etats-Unis d'Amérique
Détails:
A Cessna 208B Grand Caravan airplane, N207DR, and a Cessna T207A Turbo Stationair 7 airplane, N73789, collided in midair, approximately 14 km north of Nightmute, Alaska. Both airplanes were being operated as visual flight rules (VFR) charter flights in visual meteorological conditions when the accident occurred. The Cessna 208B was operated by Grant Aviation and the Cessna 207 was operated by Ryan Air. The sole occupant of the Cessna 208B sustained fatal injuries. The sole occupant of the Cessna 207 was uninjured. Both airplanes sustained substantial damage during the midair collision. After the collision, the Cessna 208B descended, uncontrolled, and impacted tundra-covered terrain. A postcrash fire consumed most of the wreckage. The Cessna 207 was further damaged during a forced landing on tundra-covered terrain. Both airplanes were based at the Bethel Airport, Alaska. The Cessna 208B departed from the Toksook Bay Airport (OOK) about 13:25, and VFR company flight following procedures were in effect for the flight to Bethel. The Cessna 207 departed from the Tununak Airport, Alaska, about 13:15, and VFR company flight following procedures were in effect for the return flight to Bethel.

Both pilots had a close personal relationship. After takeoff from Tununak, the pilot of the Cessna 207 talked with the pilot of the Cessna 208B on a prearranged, discreet radio frequency, and the two agreed to rendezvous for the flight back to Bethel. She said that while in cruise level flight at 1,200 feet msl, en route to Bethel, the pilot of the Cessna 208B flew his airplane along the left side of her airplane, and they continued to talk via radio. She said that the pilot of the Cessna 208B then unexpectedly and unannounced climbed his airplane above, and overtop of her airplane. She immediately told the pilot of the 208B that she could not see him, and she was concerned about where he was. She said the 208B pilot then said, in part: "Whatever you do, don't pull up." Moments later, the next thing she recalls was the 208B's impact with her airplane's right wing.
The 207 pilot reported that after the impact, she saw the 208B pass underneath her airplane, and it began a gradual descent, which steepened as the airplane continued to the left and away from her airplane. She said that she told the pilot of the 208B that she thought she was going to crash. The pilot of the 208B stated that he also thought he was going to crash. She said that she watched as the 208B continued to descend, then it entered a steep, vertical, nose down descent, before it collided with the ground. She said a postcrash fire started instantaneously upon impact.
The 207 pilot said that while struggling to maintain control of her airplane, she was unable to maintain altitude, and she selected an area of rolling, tundra-covered terrain as a forced landing site. She said that during the emergency descent, she had limited roll control, and the airplane's stall horn was on during the entire emergency approach. The airplane touched down on the soft terrain, and the nose landing gear collapsed.
The Cessna 208B's severed vertical stabilizer and rudder assemblies were found about one-half mile west of the main wreckage site, and along the two airplanes' reported flight route. A large portion of the Cessna 207's right aileron was found near the 208's rudder and stabilizer.

Probable Cause:

PROBABLE CAUSE: "The pilot's failure to maintain adequate clearance while performing an unexpected and unannounced abrupt maneuver, resulting in a midair collision between the two airplanes."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 5 months
Accident number: ANC11FA091A
Download report: Summary report

Sources:
» One pilot feared dead after planes collide (ADN, 3-9-2011)
» Updated: Troopers Investigate Midair Collision in Southwest Alaska (KTUU, 3-9-2011)


Photos

photo of Cessna 208B Grand Caravan N207DR
photo of Cessna 208B Grand Caravan N207DR
Rudder found about 1000 ft west of main wreckage
photo of Cessna 208B Grand Caravan N207DR
Add your photo of this accident or aircraft
 

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 Toksook Bay Airport, AK et Bethel Airport, AK est de 178 km (111 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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