What device is used to stop the rotor blades during shutdown?

What device is used to stop the rotor blades during shutdown?

• A. Rotor Brake
• B. Rotor Lock
• C. Rotor Stop
• D. Emergency Clutch

Answer: (A)

Stopping the rotor blades during shutdown is accomplished by engaging the rotor brake. This friction device on the rotor mast quickly arrests rotor rotation, which is especially helpful when wind could cause the rotor to windmill after the engine is off. Using the rotor brake keeps the rotor from coasting, reduces wear, and makes it safer to secure the helicopter on the ground. The other terms are not used for this purpose: a rotor lock is meant to secure the rotor for maintenance, not to stop it in normal shutdown; rotor stop isn’t a standard term for a function on the helicopter; and an emergency clutch is about decoupling the rotor from the engine in some designs, not about stopping the rotor during shutdown.

Stopping the rotor blades during shutdown is accomplished by engaging the rotor brake. This friction device on the rotor mast quickly arrests rotor rotation, which is especially helpful when wind could cause the rotor to windmill after the engine is off. Using the rotor brake keeps the rotor from coasting, reduces wear, and makes it safer to secure the helicopter on the ground. The other terms are not used for this purpose: a rotor lock is meant to secure the rotor for maintenance, not to stop it in normal shutdown; rotor stop isn’t a standard term for a function on the helicopter; and an emergency clutch is about decoupling the rotor from the engine in some designs, not about stopping the rotor during shutdown.