During rotor brake shutdown, the operation must be completed in not less than how many seconds?

During rotor brake shutdown, the operation must be completed in not less than how many seconds?

• A. 12 seconds
• B. 6 seconds
• C. 18 seconds
• D. 24 seconds

Answer: (A)

The main idea here is that rotor brake shutdown requires a minimum amount of time to let the rotor decelerate safely. Keeping the rotor brake engaged for the prescribed minimum interval allows the rotor’s kinetic energy to be dissipated in a controlled way, smoothing the deceleration and preventing abrupt loads on the drivetrain as power is removed. This helps avoid potential damage from windmilling or shock loads and ensures the rotor comes to a complete, safe stop before moving on with the shutdown or securing procedures. If the shutdown is rushed and the rotor brake is released too quickly, deceleration may be incomplete, which can lead to increased wear or safety risks. The exact duration is specified to balance safety with efficiency, ensuring a safe stop without unnecessary delay.

The main idea here is that rotor brake shutdown requires a minimum amount of time to let the rotor decelerate safely. Keeping the rotor brake engaged for the prescribed minimum interval allows the rotor’s kinetic energy to be dissipated in a controlled way, smoothing the deceleration and preventing abrupt loads on the drivetrain as power is removed. This helps avoid potential damage from windmilling or shock loads and ensures the rotor comes to a complete, safe stop before moving on with the shutdown or securing procedures. If the shutdown is rushed and the rotor brake is released too quickly, deceleration may be incomplete, which can lead to increased wear or safety risks. The exact duration is specified to balance safety with efficiency, ensuring a safe stop without unnecessary delay.