Characterizing the Frequency of ADS-B Aircraft Operations: Preliminary Analysis of the Boston Logan Mode C Veil

Analysis of discrete transponder replies received from an ASR-9 radar that were correlated with ADS-B Out in a section of airspace near Boston for 4 Mondays in 2022: 5/23, 5/30, 6/6, 6/13. Approximately 11% of discrete code beacon replies, below 1000 feet AGL and within part of the Mode C Veil, did not have a correlated ADS-B reply. These results do not support preconceived assumptions about nearly complete ADS-B equipage rates inside the Boston Mode C Veil. However any conclusions are localized, to this location and time, and may not apply to other local airspaces or the broader NASDISTRIBUTION STATEMENT A. Approved for public release. Distribution is unlimited. This material is based upon work supported by the Federal Aviation Administration under Air Force Contract No. FA8702-15-D-0001. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the Federal Aviation Administration. This document is derived from work done for the FAA (and possibly others), it is not the direct product of work done for the FAA. The information provided herein may include content supplied by third parties. Although the data and information contained herein has been produced or processed from sources believed to be reliable, the Federal Aviation Administration makes no warranty, expressed or implied, regarding the accuracy, adequacy, completeness, legality, reliability, or usefulness of any information, conclusions or recommendations provided herein. Distribution of the information contained herein does not constitute an endorsement or warranty of the data or information provided herein by the Federal Aviation Administration or the U.S. Department of Transportation. Neither the Federal Aviation Administration nor the U.S. Department of Transportation shall be held liable for any improper or incorrect use of the information contained herein and assumes no responsibility for anyone's use of the information. The Federal Aviation Administration and U.S. Department of Transportation shall not be liable for any claim for any loss, harm, or other damages arising from access to or use of data information, including without limitation any direct, indirect, incidental, exemplary, special or consequential damages, even if advised of the possibility of such damages. The Federal Aviation Administration shall not be liable for any decision made or action taken, in reliance on the information contained herein