For what purpose is the interphone system primarily used?

The interphone system is primarily utilized for crew communication purposes during flight. This system allows flight attendants and pilots to communicate effectively without needing to rely on external communication methods. It is essential for coordinating cabin operations, addressing passenger needs, discussing safety concerns, and managing any in-flight issues that may arise. The interphone enhances teamwork among crew members by facilitating quick and efficient communication in various situations, including emergencies, allowing them to respond promptly and maintain safety and service standards.

While the interphone might sometimes be used to relay information related to passengers, its primary purpose is not exclusively focused on issuing directives to passengers or contacting ground control. The system is not designed for direct communication with emergency services, which would typically involve other equipment and protocols. Thus, its main role is to support the internal communication needs of the crew.