The National Transportation Safety Board opened the public docket for its ongoing investigation of the Sept. 4, 2022, crash of a de Havilland DHC-3 Turbine Otter airplane in Mutiny Bay near Freeland, Washington.
The docket for this investigation includes more than 500 pages of factual information, including reports on operations, airplane performance, structures, systems, maintenance records, witness statements and laboratory examinations. The docket also includes interview transcripts, photographs, videos and other investigative materials.
The docket contains only factual information collected by NTSB investigators; it does not provide the final report or a probable cause. No conclusions about how or why the crash happened should be drawn from the information within the docket. The NTSB will issue a final report at a later date that will include analysis, findings, recommendations, and probable cause determinations related to the accident.
The accident occurred during a scheduled CFR Part 135 flight between Friday Harbor, Washington and Renton, Washington. The pilot and nine passengers died in the crash. The public docket for this investigation is available online at NTSB Docket - Docket Management System.
Additional material may be added to the docket as it becomes available.
The preliminary report, an investigative update, urgent safety recommendations, images and other information is available on the Mutiny Bay investigation home page: DCA22MA193.aspx (ntsb.gov).