ELT Inspection Requirements: Checks, Battery, and Penalties

Federal regulations require most U.S.-registered civil aircraft to carry a working emergency locator transmitter, and the ELT inspection requirements set by the FAA give you a firm cycle: every installed ELT must be inspected within 12 calendar months of its last inspection.¹ The inspection has to be performed by a certificated mechanic or repair station, logged in the aircraft maintenance records, and coordinated with a separate battery replacement schedule and a separate NOAA registration cycle. Miss any one of them and the aircraft is not legal to fly.

The Four Things That Get Checked

The regulation names four items the inspection has to cover:¹

Proper installation. The transmitter is securely mounted, the antenna is intact, and all connections are solid.
Battery corrosion. No visible corrosion on the terminals or inside the housing.
Controls and the crash sensor. Every switch works, including any cockpit remote switch, and the internal G-switch triggers the transmitter when a test load is applied.
Adequate signal strength. The antenna radiates a signal strong enough to reach a satellite in an actual emergency.

These are the minimum items. The manufacturer’s maintenance instructions may add more, and those instructions govern the specific test procedure.

Who Can Perform the Inspection

ELT inspection is maintenance work under 14 CFR Part 43, so it has to be performed or supervised by an appropriately certificated person. In practice that means an Airframe and Powerplant mechanic or an FAA-approved repair station using the manufacturer’s maintenance data.² An owner cannot self-sign the inspection.

The 12-month clock runs from the date of the last inspection, not from the annual. Owners often bundle the two to save a shop visit, and if you install a new ELT off-cycle you can expect the dates to drift apart until you deliberately realign them. The next inspection is due on the last day of the twelfth calendar month after the previous one.

Aircraft That Don’t Need an ELT

Before booking the shop, confirm the aircraft actually needs an ELT. The rule exempts a long list of operations, including local training flights within a 50-nautical-mile radius of the departure airport, scheduled air carrier flights, agricultural operations, design and testing flights, new aircraft delivery flights, exhibition and air-racing flights, single-seat aircraft, and, after January 1, 2004, aircraft with a maximum payload capacity of more than 18,000 pounds used in air transportation.¹

One boundary worth flagging: an older 121.5 MHz-only ELT still legally satisfies the 14 CFR 91.207 requirement if it was already installed, even though COSPAS-SARSAT satellites stopped processing 121.5 MHz signals in February 2009, and even though the FCC banned manufacture, import, and sale of 121.5 MHz-only ELTs beginning July 10, 2019.³⁴ It will still need an annual inspection, but it will not be detected by the satellite system.

Battery Replacement Runs on Its Own Clock

The battery is not tied to the 12-month inspection. Two independent triggers control replacement, and whichever comes first wins:¹

Fifty percent of the manufacturer’s stated useful life has expired. For rechargeable batteries, the same 50-percent rule applies to the useful life of the charge.
The transmitter has been in cumulative use for more than one hour. That hour includes accidental activations, functional tests, and any actual emergency use.

Water-activated batteries and other types essentially unaffected by storage are exempt from the 50-percent shelf-life trigger. Whenever the battery is replaced, the new expiration date has to be marked legibly on the outside of the transmitter and entered in the maintenance record.

Documenting the Inspection

Every ELT inspection is a maintenance entry under 14 CFR 43.9 and must include a description of the work performed, the date it was completed, the name of the person who did the work if different from the person approving it, and the signature, certificate number, and type of certificate held by the person approving the ELT for return to service.⁵ Battery work adds the new expiration date, both on the transmitter and in the logbook.¹ Recording the manufacturer’s stated useful life alongside the expiration date makes the 50-percent trigger easy to verify on the next inspection.

Temporary Removal and the 90-Day Limit

If the ELT has to come out for inspection, repair, modification, or replacement, the aircraft can still fly, but only under specific conditions. The maintenance record must show the date of removal, the ELT’s make, model, and serial number, and the reason for removal. A placard reading “ELT not installed” has to be in view of the pilot. And no one may operate the aircraft more than 90 days after the initial removal.¹ That 90-day window closes fast when a shop has a backlog or a replacement unit is on backorder.

NOAA Registration Is Separate

A passing inspection does not cover registration. Every 406 MHz ELT must be registered with NOAA, and the transmitter itself carries a label stating the requirement.⁶ Registration has to be renewed every two years, and NOAA sends reminders about two months before the renewal date.⁷ Ownership changes to either the aircraft or the ELT have to be reported. Registration is free and handled online through NOAA’s beacon registration site. Failing to register, renew, or update ownership can trigger monetary penalties under federal law.⁸

Penalties for Missing or Expired Inspections

Flying with a required ELT that is not installed, is out of inspection, or is unregistered can all draw FAA enforcement. Under 49 U.S.C. 46301, civil penalties can reach $75,000 per violation for certificate holders, with the statutory amounts adjusted periodically for inflation.⁹ Real-world ELT fines usually land well below that ceiling, but they climb quickly when combined with other maintenance discrepancies discovered during a ramp check or an accident investigation. Certificate action, including suspension or revocation of a pilot or mechanic certificate, is also available for repeated or willful violations.¹⁰

1
eCFR. 14 CFR 91.207 – Emergency Locator Transmitters
2
Federal Aviation Administration. AC 91-44A CHG 1 – Installation and Inspection Procedures for Emergency Locator Transmitters and Receivers
3
Federal Register. Termination of 121.5/243 MHz Satellite Alerting
4
eCFR. 47 CFR 87.195 – 121.5 MHz ELTs
5
eCFR. 14 CFR 43.9 – Content, Form, and Disposition of Maintenance Records
6
GovInfo. 47 CFR 87.199 – Special Requirements for 406.0-406.1 MHz ELTs
7
NOAA Beacon Registration. Frequently Asked Questions
8
Regulatory Information Service. Official 406 MHz ELT Registration Form
9
Office of the Law Revision Counsel. 49 USC 46301 – Civil Penalties
10
Federal Aviation Administration. Legal Enforcement Actions