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Last updated: 20 October 2021
Statuts:Enquête Officielle
Date:lundi 13 mai 2019
Type/Sous-type:Silhouette image of generic DH3T model; specific model in this crash may look slightly different
de Havilland Canada DHC-3T Vazar Turbine Otter
Compagnie:Taquan Air
Immatriculation: N959PA
Numéro de série: 159
Année de Fabrication: 1956
Moteurs: 1 Pratt & Whitney Canada PT6A-34
Equipage:victimes: 0 / à bord: 1
Passagers:victimes: 1 / à bord: 10
Total:victimes: 1 / à bord: 11
Victime de la collision:victimes: 5
Dégats de l'appareil: Substantiels
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:15 km (9.4 milles) NE of Ketchikan, AK (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Charter National
Aéroport de départ:Rudyerd Bay, AK, Etats-Unis d'Amérique
Aéroport de destination:Ketchikan Harbor Seaplane Base, AK (WFB), Etats-Unis d'Amérique
A float-equipped DHC-3 Turbine Otter (N959PA of Taquan Air) and a float-equipped DHC-2 Beaver (N952DB of Mountain Air Service) collided in midair, about 7 miles northeast of Ketchikan, Alaska, USA. The five occupants of the DHC-2 sustained fatal injuries. The DHC-3 pilot sustained minor injuries, nine passengers sustained serious injuries, and one passenger sustained fatal injuries.
The purpose of both flights was to transport passengers to Ketchikan from the Misty Fjords National Monument area in Alaska, USA. Both flights were converging on a scenic waterfall before returning to the Ketchikan Harbor Seaplane Base.
At 12:17:15, the DHC-3 was about level at 4,000 ft mean sea level (msl) on a track of 225°, and the DHC-2 was 4.2 nautical miles south of the DHC-3, climbing through 2,800 ft msl, on a track of 255°. About 12:19, the DHC-3 started a descent from 4,000 ft msl, and the DHC-2 was at 3,175 ft msl and climbing. During the next 1 minute 21 seconds, the DHC-3 continued to descend on a track between 224° and 237°, and the DHC-2 leveled out at 3,350 ft msl on a track of about 255°. The airplanes collided at 12:21:14 at an altitude of 3,350 ft msl, 7.4 nm northeast of Ketchikan Harbor.

The DHC-3 pilot stated to the NTSB that the flight from the Misty Fjords area had proceeded normally, and he had descended and was maneuvering the airplane to show passengers a waterfall near Mahoney Lake when the collision occurred. Just prior to the collision, he saw a flash from his left side, and experienced a large, loud impact. According to the pilot, the DHC-3 airplane then rolled right and pitched about 40 degrees nose down toward the water in George Inlet. The pilot stated that he was able to maintain some control and flare the airplane prior to impact. The pilot, some passengers, and some bystanders helped the passengers of the DHC-3 evacuate the airplane and move to the shore. The DHC-3 main wreckage came to rest about 80 ft underwater about 400 ft off the east shore of George Inlet.
The DHC-2 airplane broke up in-flight after the collision, and the wreckage was scattered over water and mountainous tree-covered terrain northeast of Mahoney Lake on the west shore of George Inlet.

Both aircraft were ADS-B-equipped and both pilots were presented with visual traffic information through the iPad with ForeFlight app (DHC-2) and Chelton display (DHC-3). However, the Garmin GSL 71 on the DHC-3 had been turned off, causing pressure altitude of the airplane not to be transmitted with the ADS-B data. Thus, both systems were not able to generate warnings of potential conflicts.
Additionally, the DHC-2 was obscured from the Otter pilot's vision by the window frame until the very last moment. The Beaver pilot likely was unable to see the Otter approaching from behind due to the aircraft structure and the passenger seated on his right.

Probable Cause:

Probable Cause:
The National Transportation Safety Board determines that the probable cause of this accident was the inherent limitations of the see-and-avoid concept, which prevented the two pilots from seeing the other airplane before the collision, and the absence of visual and aural alerts from both airplanes’ traffic display systems, while operating in a geographic area with a high concentration of air tour activity. Contributing to the accident were (1) the Federal Aviation Administration’s provision of new transceivers that lacked alerting capability to Capstone Program operators without adequately mitigating the increased risk associated with the consequent loss of the previously available alerting capability and (2) the absence of a requirement for airborne traffic advisory systems with aural alerting among operators who carry passengers for hire.

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years
Accident number: AAR-21-04
Download report: Final report

» Coast Guard statement

Opérations de secours

NTSB issued 10 Safety Recommendations

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photo of DHC-3T-Vazar-Turbine-Otter-N959PA
Preliminary ADS-B track data
photo of DHC-3T-Vazar-Turbine-Otter-N959PA
accident date: 13-05-2019
type: de Havilland Canada DHC-3T Vazar Turbine Otter
registration: N959PA

Video, social media

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 Rudyerd Bay, AK et Ketchikan Harbor Seaplane Base, AK est de 66 km (41 miles).
Accident location: Exact; deduced from 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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