# NTSB ANC22LA050: Dehavilland Beaver U-6A, N600NL, Kokhanok, AK, June 26, 2022 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: June 25, 2022, 18:00 local (Jun 26, 2022, 02:00 UTC) - Place: Kokhanok, AK - Coordinates: 59.439361, -154.7681 - Nearby events: https://openairdocs.org/map.md?lat=59.4394&lon=-154.7681&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Defining event: [Takeoff: Loss of control in flight](https://openairdocs.org/ntsb-events/240) - Highest injury: No injuries - Injuries: 7 uninjured - Status: Completed - Report: Approved by Office Director - Investigation class: Class 4 - Basic report with no Prelim publish - NTSB office: Alaska Regional Office - Parties: Federal Aviation Administration - NTSB case key (mKey): 105392 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC22LA050 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/105392/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=105392 - Page: https://openairdocs.org/ntsb/ANC22LA050 ## Probable cause The pilot’s failure to maintain directional control during takeoff in gusting wind conditions which resulted in a loss of control and impact with the water. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Wind: gusts](https://openairdocs.org/ntsb-findings/03034045): Environmental issues › Conditions/weather/phenomena · Effect on operation (probable cause); cases with it: [Dehavilland BEAVER U-6A, 1 case](https://openairdocs.org/ntsb-findings/03034045/cases.md?model=2800105), [All aircraft, 1,199 cases](https://openairdocs.org/ntsb-findings/03034045/cases.md) - [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Dehavilland BEAVER U-6A, 3 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=2800105), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md) - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Dehavilland BEAVER U-6A, 3 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=2800105), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Takeoff: Loss of control in flight](https://openairdocs.org/ntsb-events/240) (defining event); cases with it: [Dehavilland BEAVER U-6A, 1 case](https://openairdocs.org/ntsb-events/240/sequence.md?model=2800105), [All aircraft, 5,002 cases](https://openairdocs.org/ntsb-events/240/sequence.md) ## Analysis The pilot reported that, as the float-equipped airplane accelerated on the water for takeoff, a gust of wind turned the airplane 90° to the left. The left float subsequently impacted a wave and the airplane rolled inverted. The airplane eventually sank and was not recovered. The pilot reported that there were no preaccident mechanical malfunctions or anomalies that would have precluded normal operation. ## Aircraft - Registration: [N600NL](https://openairdocs.org/aircraft/N600NL), registered now, S/N 857, built 1954 (OpenAirDocs) - Reported make and model: DEHAVILLAND BEAVER U-6A - Registry model: [Dehavilland BEAVER U-6A](https://openairdocs.org/model/dehavilland-beaver-u-6a) (registry code 2800105) (OpenAirDocs) - Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 857 - Year built: 1954 - Airframe hours: 14104.3 - Engines: P&W R-985 SERIES 450 horsepower reciprocating - Damage: Substantial damage - Flight: Business, Part 91 - Operator: Newhalen Lodge Inc - Registered owner: Newhalen Lodge Inc - Airworthiness certificate: Standard, Normal - Last inspection: Annual, March 6, 2022 - Destination: Same as departure - Flight plan: Company VFR - Airport: PVT, Private - Equipment: Handheld GPS ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 73; injuries: none; airline transport, commercial, flight instructor; airplane ratings: multi-engine land, single-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review August 27, 2021; seat: left; flight hours: 19,150 total, 10,000 in this make and model, 18,950 as pilot in command, 36 in the last 90 days, 36 in the last 30 days, 2 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 150° at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 57 °F, dew point 50 °F - Altimeter: 30.27 inHg - Observed at: PAIL, 19 nm away - METAR: PAIL 260153Z 15006KT 10SM FU CLR 14/10 A3027 RMK AO2 SLP251 T01440100 ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20220625012219A](https://openairdocs.org/incident/20220625012219A), Jun 25, 2022: Dehavilland BEAVER U-6A, Kokhanok, AK, Substantial damage. Dehavilland beaver[privacy data omitted] in nondalton, AK crashed during takeoff from the south side of iliamna lake near Kokhanok, AK. The pilot reported that… ## Docket (2 files) The files NTSB released with the investigation on October 20, 2022, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=105392. 3.5 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 3.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14159927&FileExtension=pdf&FileName=6120%20dms_Redacted-Rel.pdf - Memorandum for record - damage determination (item 2, PDF, 1 page, 119 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14159748&FileExtension=pdf&FileName=Memorandum%20for%20Record%20Damage-Rel.pdf From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.