Description: the years, and established the standard for their era, with over 8 million flight-hours in total. More than 1,100 of the latest 09K50 and 08K50 versions were produced. Their ...

Until the late 1960s, control of the engine output torque and RPM was accomplished through some combination of mechanical, pneumatic, or hydraulic systems. Then, in the 1970s, electronic control ...