Can an aircraft be dispatched with a partly or completely inoperative interphone system?

An aircraft cannot be dispatched with a partly or completely inoperative interphone system because the interphone system is essential for communication among the flight crew and between the flight deck and cabin crew. Effective communication is crucial for the safe operation of the aircraft, especially in emergency situations, where timely and clear information sharing can significantly impact the safety of passengers and crew.

When an interphone system is inoperative, it compromises this vital communication link, potentially hindering the crew's ability to respond to emergencies or coordinate effectively during normal operations. Regulatory guidelines typically mandate that all essential systems, which include interphone systems, must be fully operational before an aircraft can receive clearance for dispatch. Thus, failing to meet this requirement prevents the aircraft from being deemed airworthy and ready for a safe flight.