Who must be contacted prior to removing PCA from an aircraft?

The captain must be contacted prior to removing the PCA (Pre-Conditioned Air) from an aircraft because they hold the ultimate responsibility for the safety and operation of the flight. The captain is directly involved in all critical decisions regarding the aircraft and its systems, including cabin conditions and the environmental needs of the aircraft while on the ground.

This protocol ensures that the captain is aware of changes to the aircraft's environment, which can impact passenger comfort and safety. The removal of PCA affects the cabin temperature and airflow, which can be crucial during boarding and deplaning times. By consulting the captain, the ground crew can ensure that any decisions align with the operational requirements and safety standards of the airline.

Other personnel may play important roles in the ground operation; however, the captain's authority and responsibility in these matters make them the required point of contact for decisions related to the aircraft's systems and conditions.