factors. On 4 September 2022, a DHC-3 floatplane operated by Friday Harbor Seaplanes, N725TH, crashed in Puget Sound near Whidbey Island, Washington, killing all ten aboard the aircraft. On October 24, the NTSB announced that the horizontal stabilizer actuator had separated into two pieces at a threaded assembly fitting, and that the actuator lock ring was missing from the wreckage. The next day, Viking Air issued a service letter requiring DHC-3 Otter operators to inspect the aircraft and ensure that the actuator's lock ring is present. Specifications (landplane) See also References Notes Bibliography Hayes, Karl E. DHC-3 Otter – A History (CD-ROM). Crakaig, Killiney Hill Road, Killiney, Co. Dublin, Ireland: Karl E. Hayes Publisher, 2006. (also available via CANAV Books, Toronto) Hotson, Fred W. The de Havilland Canada Story. Toronto: CANAV Books, 1983. . Michell, Simon. (ed.). Jane's Civil and Military Aircraft Upgrades 1994–95. Coulsdon, UK: Jane's Information Group, 1994. . Milberry, Larry. Aviation in Canada. Toronto: McGraw-Hill Ryerson Ltd., 1979. . Molson, Ken M. and Harold A. Taylor. Canadian Aircraft Since 1909. Stittsville, Ontario: Canada's Wings, Inc., 1982. . Rossiter, Sean. The Immortal Beaver: The World's Greatest Bush Plane. Vancouver: Douglas & McIntyre, 1999. . Rossiter, Sean. Otter & Twin Otter: The Universal Airplanes. Vancouver: Douglas & McIntyre, 1998. . Taylor, John W.R., ed. Jane's All The World's Aircraft 1988–89. Coulsdon, UK: Jane's Defence Data, 1988. . External links DHC-3archive.com de Havilland Canada DHC-3 CC-123 Otter De Havilland Canada D.H.C.3 'Otter' US Navy Otter service in Antarctica 1950s Canadian civil utility aircraft 1960s Canadian military utility aircraft DHC-3 Single-engined tractor aircraft High-wing aircraft Cruciform tail aircraft STOL aircraft Aircraft first flown in 1951