How often must an ELT be certified to ensure proper operation?

An emergency locator transmitter (ELT) must be certified annually to ensure it is functioning correctly and ready for use in an emergency situation. This requirement is part of the regulations set by aviation authorities, aimed at maintaining safety standards. The regular certification ensures that all components of the ELT, including the battery and any other critical parts, are in good working condition.

Having an annual certification schedule allows for periodic testing of the ELT's effectiveness, which is crucial because an inoperable ELT defeats its purpose of aiding rescue operations in case of an accident. The requirement goes beyond simply checking that it works when a malfunction occurs; it emphasizes proactive maintenance and operational readiness.

In contrast, monthly checks would be impractical for routine aviation operations, and every two years would not align with safety needs, as many components could deteriorate or age in that time. Relying solely on the ELT being checked only when a malfunction occurs would not be sufficient to ensure that it operates as intended when needed most.