Force Royal Norwegian Air Force Panamanian Public Forces Paraguayan Air Force: One DHC-3 donated by Argentina. Tanzanian Air Force Royal Air Force United States Air Force United States Army United States Navy Otter NU-1B is the oldest aircraft in the U.S. Navy, in service at the U.S. Naval Test Pilot School, Patuxent River, Md. Civil operators Qantas Trans Australia Airlines Royal Canadian Mounted Police Lamb Air Harbour Air Osprey Wings Ltd Provincial Airlines Air Saguenay Vancouver Island Air Bearskin Airlines (formerly) Fjellfly Varangfly Westwing A/S Widerøe Philippine Airlines (formerly) Talkeetna Air Taxi Kenmore Air Wings Airways Key West Seaplane Adventures Northwest Seaplanes Pacific Island Air Volcanic Air (Rotorua) Accidents As of June 2019, there have been 119 incidents and accidents involving the DHC-3 resulting in 242 deaths. Listed below are a select few of the most notable ones. In 1956, two military Otters broke up in mid-air. One had taken off from Downsview and the other from Goose Bay. The Otter requires immediate use of elevator trim to counteract the strong change in pitch caused by the retraction or extension of the flaps. Investigators found that metal contamination in a hydraulic valve allowed the flaps to rapidly retract with the tailplane still fully trimmed, and the consequent nose drop was severe enough to cause structural failure. A filter was added to the flap hydraulic system and an interconnection added between the flaps and tailplane to maintain proper trim as the flaps are operated. On 22 June 1994, a DHC-3 Otter floatplane, N13GA, registered to and operated by Wings of Alaska of Juneau, Alaska, crashed into the Taku Inlet, 12 miles east of Juneau. The air taxi flight had departed the Taku Lodge located on the Taku River bound for the Juneau downtown dock. Instrument meteorological conditions prevailed at the time of the accident. Six passengers were killed, one passenger was missing and presumed dead, and the pilot and three passengers received serious injuries. The National Transportation Safety Board (NTSB) attributed the accident to continued VFR into IMC and the pilot's consequent failure to maintain altitude above the water surface. On 9 August 2010, a DHC-3T registered to Anchorage-based GCI crashed about north of Dillingham, Alaska, while en route to a private fishing lodge. Five of the nine people on board were killed, including former Alaska Senator Ted Stevens. Surviving passengers included former NASA administrator Sean O'Keefe and his teenage son,