Automatic Dependent Surveillance-Broadcast (ADS-B) Out equipment performance requirements

This regulation specifies the technical performance standards your ADS-B Out equipment must meet. While §91.225 tells you *where* you need ADS-B Out, this section defines *how well* it must work.

Your ADS-B system must broadcast specific information about your aircraft, including position, velocity, altitude, and identification. The equipment must meet accuracy standards: position within 0.05 nautical miles, velocity within 10 meters per second, and specific integrity levels to ensure the data is reliable.

Two broadcast frequencies are approved: 1090 MHz (typically used by airliners and turbine aircraft) or 978 MHz UAT (commonly used by general aviation below 18,000 feet). The equipment must meet technical standards defined in specific TSO documents.

You're responsible for entering certain information correctly—particularly your aircraft ID/call sign, transponder code, and emergency status. The system handles most other data automatically, but it must transmit position updates within 2 seconds of measurement.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*