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Decision making and flight planningQuestion 780 of 934

On which three frequencies can ELTs operate?

  1. 121.5 MHz, 243.0 MHz, and 406 MHz
  2. 118.0 MHz, 121.5 MHz, and 243.0 MHz
  3. 121.5 MHz, 406 MHz, and 1090 MHz
  4. 243.0 MHz, 406 MHz, and 1030 MHz
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Correct answer: 121.5 MHz, 243.0 MHz, and 406 MHz

The 121.5 MHz and 243.0 MHz ELTs are analog. The newer 406 MHz ELT is digital.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 6-2-4 Emergency Locator Transmitter (ELT), page 489

Practice decision making and flight planning

Questions last reviewed: 18 October 2026