1973年那次石油禁运引起的能源危机,促使许多国家的飞机制造公司注意到了30座以上级的双发涡桨支线客机的换代问题。当年荷兰的F27系列,英国的HS748系列,日本的YS-11系列,这些飞机用的都是英国罗·罗公司的“达特”涡桨发动机,换代有赖于装用更好的发动机。加拿大德·哈维兰公司预测到这种需求,1972年末着手研制DHC-7客机,配4台PT6A。另一些飞 The energy crisis caused by the oil embargo in 1973 prompted many aircraft manufacturers in the United States to notice the replacement of twin-turboprop fleets of more than 30 seats. In the past, the F27 series in the Netherlands, the HS748 series in the United Kingdom and the YS-11 series in Japan all used the “Dart” turboprop engine from the British company 罗罗罗. The replacement would depend on the installation of a better engine. Canada De Havilland predicted this demand, in late 1972 DHC-7 aircraft to start research and development, with four PT6A. Some other fly