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The rotor brake should be engaged (provided that no other procedure is described in the flight manual)...

  • A

    during all prescribed pre-flight checks on the ground.

  • B

    for inside parking.

  • C

    for outside parking.

  • D

    during start-up until reaching the prescribed rotor rpm.

Rotor brake is normally a disk brake made from steel or carbon fibre often located:

  • Between the engine and main rotor gearbox, on the short shaft;

  • Immediately behind the main gearbox on the intermediate drive shaft; or

  • On the side of the main gearbox, with a disk around the main or tail rotor drive shaft that is gripped with brake pads operated by a lever in the cockpit.

A typical rotor brake system has its own accumulator, relief valve, pressure reducer, and shuttle valve.

As for the actuating mechanism it can be either:

  • By Pull cable;

  • Electrical or

  • Hydraulic.

Most helicopters use a rotor brake to:

  • stop the rotors quickly after shutting down the engine(s), for safety and convenience;

  • stop the rotors being turned by the wind when the helicopter is parked outside, and

  • help with main rotor engagement and disengagement in high wind conditions in order to prevent blade sailing.

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