FAA Ground School Practice Test

When activated, what frequencies does an emergency locator transmitter (ELT) transmit on?

1. 121.5 and 406 MHz

2. 121.5 and 243.0 MHz

3. 123.45 and 406 MHz

4. 121.5 and 288.0 MHz

The correct answer is: 121.5 and 406 MHz

An emergency locator transmitter (ELT) is designed to transmit distress signals to aid in search and rescue operations. When activated, an ELT transmits on two primary frequencies: 121.5 MHz and 406 MHz. The frequency of 121.5 MHz has been traditionally used as a distress frequency and is monitored by many aircraft and maritime organizations. It is also a frequency that can be picked up by various receivers in the vicinity, making it an essential part of emergency communication protocols. The 406 MHz frequency, on the other hand, is more advanced and carries a digital signal that can include specific identification information. This signal is monitored by satellite systems, allowing for a more precise location determination and a faster response to distress situations. The combination of these two frequencies enhances the chances of successful detection and response by rescue authorities. In contrast, while other frequency pairs mentioned in the other choices may include some frequencies that are used in aviation or maritime communication, they do not represent the appropriate combination for ELTs specifically designated for emergency signaling.