SACAA ATPL(H) Aircraft Technical & General Practice Questions - SACAA Airline Transport Pilot Licence (Helicopter) Aircraft Technical & General Knowledge Examination Exam

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In a free-turbine turboshaft engine utilized in multi-engine helicopters, what is the fundamental mechanical relationship between the gas generator turbine (N1/Ng) and the power turbine (N2/Np)?

They \are mechanically decoupled and connected only aerodynamically by the gas flow They \are rigidly mounted on a single common shaft rotating at identical RPM They \are connected through a fixed 2:1 reduction gear train inside the accessory gearbox They \are synchronized electronically via the FADEC through a torque-converter clutch

Correct Answer:

They \are mechanically decoupled and connected only aerodynamically by the gas flow

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