72 Engine Turboprop
TTP B1-L3 ATA 72 Beech 90 Series B2-L1 Engine Turbo Prop Engine T urbine/ T urbop r op 00 General 10 Reduction Gear and Shaft Section 20 Air Inlet Section 30 Comp r essor Section 40 Combustion Section 50 T urbine Section 60 Accessory Drives 70 Bypass Section The engine on the King Air C90A/B/GT aircraft is the PT6A-21 and is rated at 550-shaft horsep o w er (SHP). The engine on the C90GT/G T i aircraft is a PT6A-135A and is also rated to 550. The nomenclature stands for: P—Propeller T— T urbine 6—6th design series A— T w o-stage reduction gearb o x 21 or 135A—The sequence number in the design series The PT6 w as d e v eloped in 1958 for use in fi x ed- and rota r y-wing aircraft. The first ce r tificated engine ...