The King Air C-90 is a seven to ten-place, pressurized, all-metal, low-wing, twin-engine, turboprop aircraft that has been a staple of the charter and corporate flying business ever since its introduction in 1964.
Beechcraft has had a long history of excellence and quality and is a favorite of both operator/pilots and passengers.
Beech has produced six different basic King Air models, with the 90 series being the first and the smallest. The first Model 90 King Air was basically a Queen Air with turboprops. After it was first introduced to the flying public, the 90 series has gone through quite a few airframe and power plant modifications.
A pair of Pratt and Whitney turboprop PT6A-135 engines powers the King Air 90. Each is rated at 750 shaft horsepower. They are three-stage, axial-flow engines, with a single stage compressor and single-stage reaction turbine. A pneumatic fuel control schedules fuel flow. Propeller speed remains constant within the governing range for any given propeller control lever position.
The airplane electrical system is a 28-VDC system, which receives power from a 24-volt, 34-ampere hour NiCad battery, two 250-ampere starter-generators, or through an external power receptacle. A hot battery bus is provided to power certain convenience lights, emergency equipment, and other items. These items have power available at all times; regardless of the BATT switch position.
The fuel system on this aircraft is divided into two separate tank systems, one for each engine that is connected by a common cross feed …