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ASN Wikibase Occurrence # 225069
Last updated: 21 September 2021
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Time:12:21 LT
Type:Silhouette image of generic DHC2 model; specific model in this crash may look slightly different
de Havilland Canada DHC-2 Beaver Mk I
Owner/operator:Mountain Air Service LLC
Registration: N952DB
MSN: 237
Fatalities:Fatalities: 5 / Occupants: 5
Other fatalities:1
Aircraft damage: Written off (damaged beyond repair)
Location:Coon Cove near George Inlet area, about 8nm from Ketchikan, AK -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Passenger - Non-Scheduled/charter/Air Taxi
Departure airport:Rudyerd Bay, AK
Destination airport:Ketchikan Harbor Seaplane Base, AK (WFB)
Investigating agency: NTSB
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:
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
Download report: Final report



Photo of N952DB courtesy

Ketchikan - Harbor Seaplane (WFB / 5KE)
13 May 2015; (c) John Olafson

(c) Dean Straw, 11 August 2013 at Misty Fjords

N952DB departing from Ketchikan Harbour. June 2018

Photo: NTSB

Revision history:

14-May-2019 00:24 Geno Added
14-May-2019 00:39 Captain Adam Updated [Narrative]
14-May-2019 00:41 RobertMB Updated [Aircraft type, Narrative]
14-May-2019 00:56 Captain Adam Updated [Narrative]
14-May-2019 04:04 RobertMB Updated [Total fatalities, Location, Phase, Nature, Source, Narrative]
14-May-2019 05:07 Iceman 29 Updated [Source, Embed code, Narrative]
14-May-2019 05:48 Iceman 29 Updated [Embed code]
14-May-2019 06:03 RobertMB Updated [Embed code, Narrative]
14-May-2019 06:15 Iceman 29 Updated [Photo]
14-May-2019 08:35 Iceman 29 Updated [Source, Damage, Narrative]
14-May-2019 10:03 Iceman 29 Updated [Source, Narrative]
14-May-2019 13:46 RobertMB Updated [Narrative]
14-May-2019 14:23 Geno Updated [Time, Registration, Cn, Operator, Source]
14-May-2019 14:40 RobertMB Updated [Aircraft type]
14-May-2019 14:54 RobertMB Updated [Source, Narrative]
14-May-2019 17:28 Geno Updated [Departure airport, Destination airport, Source]
15-May-2019 05:52 harro Updated [Time, Other fatalities, Phase, Narrative]
15-May-2019 06:05 harro Updated [Embed code, Photo]
15-May-2019 08:32 fulmar01 Updated [Photo]
15-May-2019 13:06 gerard57 Updated [Other fatalities]
15-May-2019 19:29 Iceman 29 Updated [Embed code]
16-May-2019 12:19 Iceman 29 Updated [Embed code, Photo]
16-May-2019 12:20 Iceman 29 Updated [Embed code, Photo]
16-May-2019 12:23 Iceman 29 Updated [Source, Embed code, Photo]
16-May-2019 12:52 Iceman 29 Updated [Source, Embed code]
21-May-2019 17:56 harro Updated [Source]
22-May-2019 18:59 harro Updated [Time, Departure airport, Destination airport, Source]
24-May-2019 11:57 martin1967 Updated [Source]
29-Aug-2019 18:56 Anon. Updated [Narrative]
17-Aug-2020 12:37 harro Updated [Embed code, Narrative, Photo]
21-Apr-2021 08:37 harro Updated [Embed code, Narrative]
13-May-2021 18:27 harro Updated [Accident report]

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