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King Air 90 Series Maintenance Manual AMM Download
The Model 90 King Air was conceived as the Model 120 in 1961. In May 1963, Beechcraft began test flights of the proof-of-concept Model 87, a modified Queen Air with Pratt & Whitney Canada PT6A-6 engines. On July 14, Beech announced a new type, and a month later began accepting orders for the “King Air”, with deliveries to commence in Autumn 1964. On January 24, 1964, the first definitive prototype, by now designated Model 65-90 and also fitted with PT6A-6 engines, flew for the first time. After 10 months of test flying, in 1964 the Model 87 was delivered to the United States Army as the NU-8F. The first production aircraft was delivered on October 8, and by the end of the month, 152 aircraft had been ordered; by year’s end, seven had been built.
https://en.wikipedia.org/wiki/Beechcraft_King_Air
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