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

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When the collective pitch is increased on a multi-engine turbine helicopter, how does a free-turbine engine governor maintain constant rotor RPM (NR / N2)?

It senses the impending drop in N2/NR speed and increases fuel flow to increase N1/Ng speed and gas energy It increases power turbine shaft pitch to match the increased main rotor resistance directly It opens variable inlet guide vanes (VIGVs) to bypass excess gas \around the power turbine stage It mechanically advances the N2 turbine governor flyweights to increase power turbine gear ratio

Correct Answer:

It senses the impending drop in N2/NR speed and increases fuel flow to increase N1/Ng speed and gas energy

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