AA.VII.C.K5FAA-S-ACS-11A · Nov 2023Knowledge
Emergency Locator Transmitters (ELTs) and other emergency locating devices.
Emergency Locator Transmitters (ELTs) and other emergency locating devices.
Bottom line
An emergency locator transmitter (ELT) is a small, self-contained radio transmitter that automatically transmits an emergency signal upon the impact of a crash. An ELT is required by 14 CFR, part 91, section 91.207, and must be inspected within 12 calendar months after the last inspection. ELT batteries must be replaced, or recharged if the batteries are rechargeable, when the transmitter has been in use for more than 1 cumulative hour.
Key numbers
| Number | What it means |
|---|---|
| Within 12 calendar months after the last inspection | Inspection |
| More than 1 cumulative hour of transmitter use | Battery use |
| 50 percent of battery useful life expired (or 50 percent of charge life for rechargeable batteries) | Battery life |
| 121.5, 243.0, or 406.0 MHz | Frequencies |
FAA references
- AFH Glossary (p. G-6) — FAA-H-8083-3C
- PHAK ch. 9 (p. 9-9) — FAA-H-8083-25C (2023)
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