![]() ![]() In 1976, the C90 received a new engine, the PT6A-21. ![]() The C90 was next to be introduced in 1971, with a new cabin pressurization system that used bleed air from the engines (which increased cabin noise and reduced engine power). In 1968, the B90 brought an increase in wingspan, recontoured rear fuselage, balanced controls, and a 350-pound gross weight increase. The A90 came along in 1966 with reverse pitch props, increased cabin pressure (3.1 psi to 4.6 psi), the PT6A-20 engine, and a gross weight increase of 300 pounds. Over time, both the engine and the powerplant grew. The PT6A-6 did not have a reverse-pitch prop. The original Model 90 was powered by a Pratt & Whitney PT6. Beech airplanes are now being built by Hawker Beechcraft Coorporation. The King Air competes with other turboprops such as the MU-2, Conquest, and Cheyenne 400 LS. After its introduction, the 90 series went through a number of airframe and powerplant modifications. The first Model 90 King Air was introduced in 1964 it was basically a Queen Air with turboprops. ![]() Beech has produced six different basic King Air models, with the 90 series the smallest. ![]()
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