During extended ground operations and AFCS test during run-up, the collective must be secured with the ______.

• A. Tie-Down Strap
• B. Chocks
• C. Parking Brake
• D. Collective Pitch Lock

Answer: (D)

During maintenance and run-up, keeping the rotor from moving is essential for safety. Engaging the collective pitch lock directly prevents the collective from changing blade pitch, which in turn stops any unintended rotor movement during AFCS checks or prolonged ground operations. This is the most reliable way to keep the rotor in a safe, fixed position while personnel are nearby and systems are tested. Tie-down straps and chocks control the aircraft’s ground position, but they don’t stop changes in rotor blade pitch or prevent rotor movement, and a parking brake may not provide the needed lock for the rotor system. Therefore, using the collective pitch lock gives a direct, effective safeguard for the rotor during these procedures.