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| BAS Dash 7 | |
|---|---|
| Name | Dash 7 |
| Manufacturer | de Havilland Canada |
BAS Dash 7
The Dash 7 is a four-engined, high-wing turboprop regional transport aircraft developed in the 1970s as a short takeoff and landing (STOL) commuter airliner and freighter. Designed to operate from short, unprepared, or noise-restricted runways, the type attracted interest from municipal authorities, regional airlines, and military operators across North America, Europe, and Asia. Its development, operational deployment, and subsequent influence intersect with numerous aerospace companies, regulatory authorities, and air transport networks.
The design program began amid interactions among de Havilland Canada, the Canadian Department of Transport, and aerospace suppliers such as Pratt & Whitney Canada, Hamilton Standard, and Dowty Rotol, responding to airline requirements articulated by executives from Air Canada, Pacific Western Airlines, and Alaska Airlines. Early design meetings referenced research by the National Research Council of Canada and engineering practices used by Boeing, Bombardier, and Lockheed on regional platforms. The fuselage followed work by Hawker Siddeley and Short Brothers on commuter airframes, while wing and flap systems drew on flap research at the Royal Aircraft Establishment and aerodynamic studies conducted in partnership with universities such as McGill University and the University of Toronto. Certification followed processes prescribed by Transport Canada and the United States Federal Aviation Administration, with test programs that engaged test pilots from the Royal Canadian Air Force and test engineers who had previously worked on the de Havilland Canada Twin Otter and Dash series.
The Dash 7 featured a high-lift wing with full-span double-slotted flaps and four turboprop engines driving large-diameter three- or four-bladed propellers supplied by Hamilton Standard or Dowty, technologies contemporaneous with systems used on the Fokker F27 and Convair 580. The avionics suite incorporated navigation equipment compatible with Instrument Landing System approaches standardized by the International Civil Aviation Organization and communication radios similar to those found on models by Collins Aerospace and Honeywell. Structural design employed aluminum alloy skinning and semi-monocoque construction techniques akin to those used on Airbus and Lockheed regional types, and landing gear systems shared engineering lineage with designs from Short Brothers. Cabin arrangements allowed multiple seating configurations influenced by specifications from airlines like United Airlines, British Airways, and KLM for commuter comfort and cargo conversion options favored by FedEx Express and UPS. Powerplants were selected for their reliability comparable to engines used on the ATR 42 and Embraer EMB 110, and noise abatement features paralleled those promoted by the International Civil Aviation Organization and the Federal Aviation Administration.
Commercial service commenced following deliveries to launch customers who operated routes alongside networks run by American Airlines, Lufthansa, and Japan Airlines. The type served short-haul city pairs including operations into airports constrained by municipal noise ordinances similar to those affecting operations at New York LaGuardia, London City, and Tokyo Haneda, and it supported feeder routes feeding hubs such as Chicago O’Hare, Toronto Pearson, and Vancouver International. Military and government operators applied the airframe to liaison, medevac, and special missions paralleling roles flown by aircraft procured by the United States Navy, Royal Air Force, and Royal Canadian Air Force. The aircraft’s STOL capability was highlighted in services to remote communities served by airlines like Pacific Western, Northern Air, and Alyemda, and in government contracts administered by agencies such as the Canadian Department of National Defence and the United States Department of Defense.
Production variants mirrored patterns seen in regional types produced by ATR, Embraer, and Fokker: passenger, combi, freight, and corporate conversions. Special mission modifications included surveillance suites used by coast guard organizations and airborne early warning configurations studied by defense contractors including Lockheed Martin and Northrop Grumman. Proposed stretched and re-engined derivatives were evaluated with input from engine manufacturers including General Electric and Rolls-Royce, while avionics upgrades paralleled refits implemented on fleets by operators such as SAS and Qantas. Conversion programs for aerial survey and VIP transport followed precedents set by conversions of the de Havilland Canada Twin Otter and the Beechcraft King Air.
Operators encompassed a mix of regional airlines, national carriers, and government services. Key commercial operators included regional subsidiaries of Air Canada, Alaska Airlines, and KLM, as well as carriers like Frontier Airlines, Olympic Airways, and Scandinavian Airlines System. International governmental operators included air arms of the Royal Canadian Air Force, the United States Department of Homeland Security components, and civil agencies in Brazil and Indonesia. Cargo operators ranged from integrators such as FedEx Express to specialist freight firms that paralleled the operational footprints of companies like Emery Worldwide and DHL.
Accident records involved investigations by national aviation authorities including the Transportation Safety Board of Canada, the National Transportation Safety Board, and the Air Accidents Investigation Branch. Analysis by investigators referenced methodologies used in inquiries into incidents involving the de Havilland Twin Otter, ATR 72, and Fokker 50, with contributory factors spanning weather phenomena studied by the World Meteorological Organization, maintenance practices aligned with guidance from the International Air Transport Association, and human factors explored in research by NASA and the Flight Safety Foundation. Findings influenced airworthiness directives issued by Transport Canada and the FAA and operational procedures adopted by regional carriers and military units.
Preservation efforts involve aviation museums, historical societies, and restoration groups similar to institutions such as the Canada Aviation and Space Museum, the Smithsonian Institution’s National Air and Space Museum, and the Imperial War Museum. Several airframes were retained for display or conversion into museum exhibits, corporate hospitality spaces, and instructional airframes for technical training at colleges like Fanshawe College and Seneca College. The design’s influence is evident in subsequent regional aircraft development by Bombardier, ATR, and Embraer, and in continuing discussions within industry bodies such as the International Air Transport Association and the Royal Aeronautical Society about regional mobility, STOL operations, and community air service.
Category:Regional airliners