The rugged Canadian bush plane that never stopped flying. Built for short takeoff and landing from gravel, snow, ice and water, it remains the workhorse of choice for regional airlines, polar research stations and skydiving operators from the Maldives to Antarctica. Developed by de Havilland Canada / Viking Air.
The rugged Canadian bush plane that never stopped flying. Developed by de Havilland Canada / Viking Air.
Photo: NASA / Chuck Ritchie, Public domain, via Wikimedia CommonsSee Specifications for full detail.
The de Havilland Canada DHC-6 Twin Otter is a twin-engine turboprop STOL aircraft designed for short-field and bush operations. It first flew in 1965 and can be fitted with wheels, floats or skis, letting it operate from gravel bars, glaciers, lakes and short unpaved strips.[1]
Production ended in 1988 but resumed in 2007 after Viking Air, holder of the type certificate, judged continuing demand strong enough to restart the line - one of the few aircraft ever returned to production this way. It remains in production today as the Series 400 and Classic 300-G.[2]
De Havilland Canada spent the 1950s perfecting bush aircraft - Beaver, then Otter - and the DHC-6 was their logical multiplication: two of Pratt & Whitney Canada's brand-new PT6 turboprops on a stretched, fixed-gear, high-wing airframe with STOL wings, aimed at operators who needed Otter manners with commuter capacity and engine-out safety.[1]
It flew on 20 May 1965 and found two markets at once: the bush and float operators it was designed for, and - unexpectedly - the new 'commuter airline' boom in the United States, where its nineteen seats fit the regulations and its short-field manners fit downtown STOLports. The Twin Otter became the world's default third-level airliner.[1]
The Twin Otter's genius is honest STOL: a big straight wing with double-slotted flaps, fixed tricycle gear that swaps to floats, skis, wheel-skis or tundra tyres in a shift, and PT6 reliability in places where a mechanic is a radio call and a day's flying away. Takeoff and landing runs under 400 metres - far less lightly loaded - open strips nothing else with two engines can use.[2]
It is deliberately simple to keep flying: unpressurised, mechanical, tolerant of cold-soak at -50°C and coral-dust at +40°C, field-repairable, and forgiving enough that it serves as half the world's introduction to multi-engine bush flying. The Series 400 restart added modern Honeywell avionics while changing the airframe as little as possible - operators insisted.[2]
The type's postings read like an atlas of difficult places: Maldivian float fleets running the world's largest seaplane operation, Kenn Borek's red-and-white machines working both polar regions, island-hoppers in the Caribbean and Pacific, skydiving lifts on every continent, and parapublic fleets from the Chilean fjords to the Norwegian coast. Some 30+ militaries have flown it, including the U.S. Army's new grey Grand Caravans-with-attitude for Arctic work.[1]
Its legend is polar. Ski-equipped Twin Otters supply Antarctic field camps, and twice - in 2001 and 2016 - Kenn Borek crews flew midwinter medical evacuations from the South Pole itself: minus 60°C, months of darkness, landings by flare-light at the coldest airstrip on Earth. No other aircraft type has ever done it.[3]
Around 985 classic-build aircraft were followed by 150+ Viking/DHC Series 400s; hundreds of fifty-year-old examples still earn daily revenue, kept ageless by unlimited-life structural programs and the absence of any substitute.[2]
The resurrection is the singular chapter: production ended in 1988 when parent policy moved on, but values of used Twin Otters kept climbing until Viking Air - holder of the type certificates - concluded the absurd was commercial sense and relaunched manufacture in 2007. First new-build Series 400 flew in 2010; the De Havilland Canada name returned to the program in 2019, and the refreshed Classic 300-G keeps the order book alive into the 2030s.[2]
Nineteen seats, two PT6s, fixed gear: the specification has survived sixty years essentially intact because every attempt at a 'Twin Otter replacement' - including several by its own manufacturers - discovered the replacement was a Twin Otter.[1]
The Twin Otter is infrastructure disguised as an aircraft: for hundreds of communities from Nunavut to the Nepali hills, it is the road, the ambulance, the mail van and the school bus. Aviation measures most types in performance; this one is measured in places that exist on the network only because it exists.[2]
Its production resurrection remains nearly unique in aviation history - the market simply refused the aircraft's retirement, and sixty years after first flight the Twin Otter is still building the order book, still flying the South Pole logbook and still keeping the Lukla schedule[4].[1]
Filter Flightradar24's aircraft-type field for "DHC6" or search by operator callsign - Trans Maldivian Airways' seaplane sightseeing hops rarely appear (many are flown below radar/ADS-B coverage over remote atolls), but overland regional and commuter operators such as Kenn Borek Air, Loganair, and Cape Air-style bush carriers are commonly visible on domestic routes.
| Performance | |
| Max Speed | 182 kn (210 mph / 337 km/h) |
|---|---|
| Cruise SpeedCruise Speed — The economical speed an aircraft sustains for the bulk of a flight - lower than maximum speed, chosen for the best balance of time and fuel burn. Glossary → | 184-210 mph depending on series and altitude |
| RangeRange — How far an aircraft can fly without refuelling. Quoted figures vary with payload, speed and reserves - see also ferry range and combat radius. Glossary → | ~890-920 mi ferry range; typical operational legs are far shorter |
| Service CeilingService Ceiling — The highest altitude at which an aircraft can still climb at a useful rate (typically 100 ft/min). Above it, the air is too thin to keep climbing meaningfully. Glossary → | 25,000 ft, both engines operating |
| Airframe & Weight | |
| Wingspan | 65 ft 0 in |
| Length | 51 ft 9 in, Series 300/400; earlier Series 100 was 49 ft 6 in |
| Height | 19 ft 6 in |
| WeightMTOW — Maximum Take-Off Weight - the heaviest an aircraft is certified to be at the start of its take-off run, including fuel, crew, payload and the aircraft itself. Glossary → | empty: ~7,415 lb; MTOW: 12,500 lb, Series 300/400 |
| Power & Payload | |
| Engines | 2 x Pratt & Whitney Canada PT6A-34 turboprops (750 shp, flat-rated to 620 shp), Series 400; earlier series used PT6A-20 or PT6A-27 |
| Crew | 1-2 pilots |
| CapacityPayload — Everything an aircraft is carrying that isn't the aircraft or its fuel: passengers, cargo, or weapons. Payload and fuel usually trade off against each other. Glossary → | 18-19 passengers (commuter/regional configuration) or equivalent cargo/medevac load |
| Program & Service | |
| Manufacturer | de Havilland Canada / Viking Air |
| Origin | Canada |
| First Flight | May 20th 1965 |
| Service Entry | January 1st 1966 |
| Number Built | 1,000 |
| Unit Cost | ~$7.25M (2023, fully-equipped Series 400) |
54 notable events involving the DHC-6 Twin Otter, 1968 to 2025, accounting for 606 deaths. Curated rather than exhaustive.
The aircraft struck a light pole in fog about 1.8 miles short of John Wayne Airport, California, killing nine people.
The Twin Otter collided in mid-air with a North Central Airlines Convair 580 over Appleton, Wisconsin. All eight aboard the Twin Otter and all five in the Convair were killed.
An Argentine Army Twin Otter crashed in bad weather while flying without a filed flight plan, killing all thirteen on board.
The commuter Twin Otter collided with a Cessna 150 over Whittier, California. Twelve people on the airliner and both occupants of the Cessna were killed.
A Twin Otter being demonstrated at Monze Air Force Base crashed on takeoff, killing eleven people.
The aircraft came down short of the runway, killing three of those on board.
The Twin Otter flew into a mountain on approach in British Columbia, killing all twelve aboard.
Three crew were killed when the aircraft crashed during a training flight.
A corroded rod failed and let a flap retract on approach; the crew lost control and eleven people were killed.
Members of the Peoples Temple opened fire on a Twin Otter and a Cessna evacuating defectors from Jonestown, Guyana, disabling the Twin Otter with gunfire. Five people were killed at the airstrip, among them US Congressman Leo Ryan.
Severe icing and a mountain-wave downdraft forced the aircraft down onto snow in Colorado. The impact was survivable for most on board, but two people died.
The Twin Otter crashed about 1.2 miles from Knox County Regional Airport, Maine, killing seventeen of the eighteen people aboard.
The aircraft flew into woodland on approach to Hyannis, Massachusetts; the captain was killed and the other occupants survived.
The Twin Otter struck a mountain in cloud, killing all nineteen people on board.
A Panamanian Air Force Twin Otter crashed in mountainous terrain, killing General Omar Torrijos, Panama's de facto leader, and six others. The cause remains disputed.
A fire broke out on board and the crew put the aircraft down in a frozen field in Connecticut. One passenger died.
The Twin Otter came apart and fell into the Barents Sea off northern Norway, killing all fifteen aboard. The official finding was a failure in the elevator control system, but the cause was contested for decades.
A Canadian Forces Twin Otter searching for a missing aircraft crashed after the crew were affected by visual illusion, killing all eight aboard.
A sightseeing Twin Otter collided with a Bell 206 helicopter over the Grand Canyon. All twenty on the aeroplane and all five in the helicopter died; the accident led to new rules for air tours over the canyon.
The aircraft came down in the Caribbean Sea en route from St Lucia, killing all thirteen on board.
The Twin Otter struck high ground on approach to Molokai Airport, Hawaii, killing all twenty people aboard.
The aircraft crashed into the sea off Værøy, Norway, in violent wind, killing all five on board.
Contaminated fuel caused a loss of power on takeoff and the aircraft crashed beside the runway in California, killing sixteen of the skydivers and crew aboard.
The aircraft flew into a forested hillside at night on approach in Norway, killing six of the crew and passengers.
The Twin Otter struck a mountain at 6,400 ft en route, killing all twenty-eight people on board.
The aircraft disappeared in bad weather on an Indonesian domestic flight; all fourteen aboard were killed.
The Twin Otter crashed about five miles from Olaya Herrera Airport, Medellín, killing all fourteen on board.
While diverting to Faleolo International Airport in bad weather the aircraft flew into terrain, killing three people.
A Royal Nepal Airlines Twin Otter struck a hillside near Jogbuda on final approach to Dhangadhi Airport, killing all 25 aboard.
The Twin Otter crashed near Gustaf III Airport on St Barthélemy, killing all nineteen aboard and one person on the ground.
The aircraft flew into a mountain three miles south-east of Pokhara Airport, Nepal, killing all eighteen on board.
The airline's only aircraft, S9-BAL, crashed on a training flight, killing all four on board.
The Twin Otter crashed at the edge of the runway at Jumla Airport, Nepal, killing all nine on board.
A French Twin Otter supporting the Multinational Force and Observers crashed in Egypt, killing all nine aboard.
An Air Moorea DHC-6-300 crashed into the sea shortly after takeoff from Moorea, French Polynesia, after its elevator control cable failed in flight. All 19 passengers and the pilot were killed.
The aircraft was destroyed landing at Tenzing-Hillary Airport, Lukla, one of the world's most demanding airstrips. Eighteen of the nineteen people aboard were killed.
The Twin Otter crashed about fourteen miles north of Oksibil in Papua, killing all sixteen on board.
The aircraft struck a mountain on the Kokoda run in Papua New Guinea, killing all thirteen aboard.
The Twin Otter came down shortly after takeoff on a Nepalese domestic flight, killing all twenty-two on board.
An Ecuadorian Air Force Twin Otter crashed en route between Río Amazonas and Mayor Galo de la Torre airports, killing six.
A float-equipped Twin Otter came down in a street in Yellowknife, killing both pilots and injuring seven people on the ground.
A Kenn Borek Air Twin Otter on a supply run in Antarctica struck Mount Elizabeth after the crew turned too early in poor visibility. All three crew were killed.
The aircraft crashed while landing at Kudat Airport in Sabah, Malaysia, killing two of those on board.
The Twin Otter crashed in bad weather en route from Pokhara to Jumla, killing all eighteen on board.
The aircraft crashed on landing in Papua New Guinea, killing four people.
The pilot deviated from the route to Makassar and the aircraft struck mountainous terrain in Sulawesi, killing all ten on board.
The Twin Otter crashed shortly after takeoff from Pokhara on a flight to Jomsom, killing all twenty-three people on board.
An Ethiopian Air Force Twin Otter flying from Dire Dawa crashed at Nannawa, killing eighteen people.
The aircraft crashed in the Hoeya district after departing Timika, killing all four on board.
The Twin Otter crashed in the mountains after leaving Pokhara for Jomsom, killing all twenty-two on board.
A Twin Otter came down in the sea off Half Moon Bay, California, killing two people.
The aircraft came down about 190 miles north-east of Yellowknife in Canada's Northwest Territories with no loss of life.
The Twin Otter crashed attempting to land at Panua Airport in Pohuwato Regency, Indonesia, killing four on board.
A Royal Thai Police Twin Otter crashed into the sea near Hua Hin Airport during a parachute training flight, killing six.
| Series 100/200 | Original 1966-onward production standard with 550 shp PT6A-20 engines; Series 200 added a slightly restyled nose baggage compartment. |
| Series 300 | Most numerous original-production variant (from 1969) with more powerful 620 shp PT6A-27 engines and increased maximum takeoff weight; 614 built before 1988. |
| Series 400 | Viking Air's relaunched production standard (first delivered 2010) with PT6A-34 engines, a Honeywell Primus Apex glass cockpit, and composite airframe components. |
| Series 300-G 'Classic' | 2023-launched upgrade package pairing the existing Series 300 airframe with a new Garmin glass cockpit and modernized interior. |
| DHC-6-300M / Twin Otter on floats/skis | Military utility and float/ski-equipped variants used for Arctic and Antarctic logistics, medevac, and paratrooper operations. |
Source: Aerospace Global News
Numbered as cited in the Overview article. Click a reference to see where it's used.
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