The King Air 90 is a seven-to ten-place, pressurized, all- essence, low-sect, binary-machine, turboprop aeroplane with retractable wharf gear. This aeroplane is certified in the normal category.
The King Air F90 is powered by two Pratt and Whitney turboprop PT6A- 135 machines, each rated at 750 shp. They’re three-stage, axial- inflow machines, with a single stage compressor and single-stage response turbine. A curvaceous energy control schedules energy inflow. Propeller speed remains constant within the governing range for any given propeller control switch position.
The King Air 90’s fuel system consists of two separate tank systems, one for each machine, connected by a common cross feed line. Each main system consists of a nacelle tank, two sects leading- edge tanks, all of which graveness feed into the nacelle tanks. Each main system has an aggregate of 194 usable gallons. It employs an automatic energy transfer system to supply the fuel to the main system. Each machine drives a high-pressure energy pump and a low- pressure boost pump.