What is the inspection interval for transponder devices?

The correct inspection interval for transponder devices is 24 calendar months. This requirement is stipulated by the Federal Aviation Administration (FAA) in accordance with 14 CFR Part 91.413, which mandates that all aircraft equipped with transponders must undergo a proper inspection to ensure that the equipment is functioning correctly and meeting performance standards. This inspection is essential for ensuring the safety of airspace operations, as transponders play a crucial role in identifying and tracking aircraft.

The 24-month interval is designed to provide a balance, allowing for the necessary checks to ensure reliability while not being so frequent as to be burdensome for operators. This period helps ensure that transponder equipment remains compliant with regulatory standards, thus contributing to overall flight safety and operational integrity.