Who must sign the A-sheet?

The correct answer emphasizes the importance of a team approach in ensuring the aircraft's airworthiness and operational readiness. The A-sheet, which contains critical information and outlines the aircraft's maintenance and operational status, must be signed by the Plane Captain, who is responsible for the overall maintenance and readiness of the aircraft, and the Qualified Safe for Flight personnel. This ensures that the aircraft has undergone the proper checks and is deemed safe to fly, thus ensuring a thorough review of all necessary documentation by both maintenance and operational personnel. Additionally, the Helicopter Aircraft Commander (HAC) also signs to confirm they acknowledge the condition and status of the aircraft before flight operations. This collaborative confirmation is crucial for maintaining the highest safety and operational standards in aviation.