Which frequencies does the ELT broadcast on when activated?

The Emergency Locator Transmitter (ELT) broadcasts on the 121.5 MHz and 406 MHz frequencies when activated. The 121.5 MHz frequency is used primarily for search and rescue operations and has been the traditional frequency for ELTs. It allows for detection by general aviation and is monitored by civil authorities. The 406 MHz frequency represents a newer standard that offers improved accuracy and more robust distress signals, as it incorporates GPS location information.

When an ELT activates, it transmits a signal on both of these frequencies, enhancing the chances of rapid detection and allowing search and rescue operations to be conducted more effectively. The combination of these two frequencies is part of the international standards for distress signals, ensuring that ELTs are compliant with safety regulations and serve their purpose of aiding in emergency situations.