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The two functions of a NR trim system in a multi-engine helicopter are (1) _____ and (2) _____.

  • A

    (1) manual adjustment of rotor RPM; (2) synchronization of the engines’ N2 speeds

  • B

    (1) synchronization of the engines’ N1 speeds; (2) manual adjustment (“beeping”) of rotor RPM

  • C

    (1) synchronization of the engines’ N1 speeds; (2) synchronization of the engines’ N2 speeds

  • D

    (1) reduction of rotor RPM at ground idle; (2) synchronization of the engines’ N1 speeds

The NR trim system in a twin-engine helicopter works by adjusting the rotor RPM and synchronizing the engines' N2 speeds. This system ensures that the rotor speed remains stable and consistent within a specific range, typically from 97% to around 103%, which is crucial for maintaining control and performance during flight.

The system typically involves automatic governors that sense any small, uncommanded variations in rotor speed and compensate by adjusting the fuel flow to the engines. This helps maintain the desired rotor speed and ensures that both engines are operating in harmony, providing balanced power output.

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