When is an ELT not required on an aircraft?

An Emergency Locator Transmitter (ELT) is not required on an aircraft in scheduled carrier operations because commercial air transport operations typically have other safety protocols and communication systems in place. Scheduled carriers usually operate under stringent regulations that involve regular flight monitoring, including flight plans and communications with air traffic control. This level of oversight reduces the necessity for ELTs, which are primarily intended for general aviation aircraft that may operate in more remote areas without continuous radar coverage or communication.

For the other scenarios, ELTs serve as crucial safety devices, especially during night operations, flights above 10,000 feet, and aerobatic maneuvers, where the risks of an emergency situation necessitate having an effective means of location in the event of an accident. Thus, while there are certain exceptions for specific situations or aircraft types, scheduled carrier operations are designed in such a way that makes the requirement for an ELT redundant.