ASN Aircraft accident Viking Air DHC-6 Twin Otter 400 N153QS Half Moon Bay Airport, CA (HAF)
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Status:Information is only available from news, social media or unofficial sources
Date:Saturday 20 May 2023
Time:c. 14:15
Type:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different
Viking Air DHC-6 Twin Otter 400
Operator:Seafly LLC
Registration: N153QS
MSN: 869
First flight: 2012
Crew:Fatalities: 2 / Occupants: 2
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 2 / Occupants: 2
Aircraft damage: Damaged beyond repair
Location:54 km (33.8 mls) W off Half Moon Bay Airport, CA (HAF) (   Pacific Ocean)
Phase: En route (ENR)
Departure airport:Santa Rosa-Sonoma County Airport, CA (STS/KSTS), United States of America
Destination airport:Honolulu-Daniel K. Inouye International Airport, HI (HNL/PHNL), United States of America
A DHC-6 Twin Otter 400, N153QS, crashed into the Pacific Ocean about 54 km west of the Half Moon Bay Airport (HAF), California.
The aircraft had departed Santa Rosa-Sonoma County Airport, California (STS) at 15:21 UTC (08:21 local time) on a flight to Honolulu International Airport, Hawaii (HNL).
ADS-B data suggests that the aircraft at some point turned back, heading for HAF, until it crashed at 14:15 local time.

Accident investigation:

Investigating agency: NTSB
Status: Investigation ongoing



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This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Santa Rosa-Sonoma County Airport, CA to Honolulu-Daniel K. Inouye International Airport, HI as the crow flies is 3827 km (2392 miles).
Accident location: Approximate; accuracy within a few kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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DHC-6 Twin Otter

  • 930+ built
  • 286th loss
  • 184th fatal accident
  • 137th worst accident
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 Pacific Ocean
  • 98th worst accident
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