Quick Answer
MOST emergency locator transmitters (ELTs) have a range of approximately 100 to 200 nautical miles (185 to 370 kilometers) under ideal conditions, which includes clear line-of-sight with the satellite network. However, this range can be significantly reduced due to various environmental factors.
Types of ELTs
ELTs come in two main types: 121.5 MHz and 406 MHz. The 121.5 MHz ELTs have a longer range but are being phased out by the Federal Aviation Administration (FAA) in favor of 406 MHz ELTs. 406 MHz ELTs, on the other hand, have a shorter range but are more accurate and can be located more precisely by search and rescue teams.
How ELTs Work
ELTs work by transmitting a distress signal to the international Cospas-Sarsat satellite system, which then forwards the signal to emergency responders. ELTs typically include an antenna, a transmitter, and a battery. They are usually activated by an impact sensor, which is triggered by a sudden drop in altitude, and can also be manually activated by pilots or passengers. ELTs are required equipment on all commercial aircraft and are highly recommended for private aircraft and recreational vehicles.
Maintenance and Testing
Regular maintenance and testing of ELTs are essential to ensure they are functioning properly. This includes checking the battery, antenna, and transmitter for any damage or corrosion. ELTs should also be tested annually to ensure they are transmitting a strong signal. Pilots and vehicle owners should also familiarize themselves with the ELT’s operation and any specific procedures for manual activation.
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