What is the rotor brake limit in RPM?

What is the rotor brake limit in RPM?

• A. 170
• B. 150
• C. 200
• D. 220

Answer: (A)

The rotor brake is intended to stop the main rotor after shutdown, and there is a maximum rotor speed at which you may safely engage the brake. If you apply the brake while the rotor is turning faster than that limit, the braking torque can overload the rotor system and gear train, causing damage. For the MH-65E, that safe limit is 170 RPM. So the brake should be engaged only when the rotor has decelerated to about 170 RPM or below. At speeds higher than that, applying the brake is not permitted because it risks excessive load on the brake and drivetrain. Higher options would exceed the brake’s rating, while the limit itself defines the maximum safe speed to engage the brake.

The rotor brake is intended to stop the main rotor after shutdown, and there is a maximum rotor speed at which you may safely engage the brake. If you apply the brake while the rotor is turning faster than that limit, the braking torque can overload the rotor system and gear train, causing damage. For the MH-65E, that safe limit is 170 RPM. So the brake should be engaged only when the rotor has decelerated to about 170 RPM or below. At speeds higher than that, applying the brake is not permitted because it risks excessive load on the brake and drivetrain. Higher options would exceed the brake’s rating, while the limit itself defines the maximum safe speed to engage the brake.