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The Learjet 28 is an American eight-to-ten-seat (two crew and six to eight passengers), twin-engine, high-speed business jet, intended to be the successor to the Learjet 25. The Learjet 29 is identical except for the addition of a long-range fuel tank, resulting in the reduction of the capacity to six (two crew and four passengers). Both were manufactured by Learjet and were marketed under the Longhorn name.〔(A history of the LJ23-LJ29 series on Airliners.net )〕 ==History== The first flight of the Learjet 28 took place on August 24, 1977. FAA certification was awarded to both the Learjet 28 and 29 on July 29, 1979.〔(Learjet company timeline )〕 The Learjet 28/29 was the first production jet aircraft to utilize winglets (entering service in 1977). The Learjet 28/29 was based on the Learjet 25, and received a completely new wing fitted with winglets which resulted in improved performance and fuel economy.〔 Both models were commercially unsuccessful due to their outdated engines (noise and fuel consumption being too high). Only five production LearJet 28s, and four LearJet 29s, were constructed before production ceased in 1982. Both types were subsequently replaced by the Learjet 35.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Learjet 28」の詳細全文を読む スポンサード リンク
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