The FAA's Public ADS-B Performance Report (PAPR) is a free online tool that evaluates how well your aircraft's ADS-B Out system is performing during an actual flight. After a qualifying flight, aircraft owners, operators, or maintenance personnel can request a report that identifies whether the ADS-B installation is transmitting data correctly and meeting FAA performance requirements.

For additional information:

https://adsbperformance.faa.gov/PAPRRequest.aspx