What is the primary requirement for carrying an ELT on board an aircraft?

The primary requirement for carrying an Emergency Locator Transmitter (ELT) on board an aircraft is that at least one automatic ELT is needed. The purpose of an ELT is to enhance the chances of locating an aircraft in the event of an accident or emergency. An automatic ELT is designed to activate upon a sudden change in altitude or specific g-force thresholds, ensuring it transmits a distress signal without requiring pilot intervention during critical moments. This automatic activation significantly improves search and rescue operations.

In situations where an aircraft goes down, having an automatic ELT onboard can provide rescuers with vital information regarding the aircraft's location more quickly than if only a manual ELT existed, which would need to be activated by someone post-incident. The requirement emphasizes the importance placed on safety and preparedness in aviation operations, ensuring that every aircraft is equipped with the necessary technology to assist in rapid recovery efforts should an emergency arise.