Question 12, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Prevent Damage To The System When The Helicopter Is Parked In High Winds.
Act As A Stop In Case Of Vibration Of The Controls.
Bring The Main And Tail Rotors To Rest As Soon As Possible After Shut-down.
Restrict the movement of the controls within the correct range.