TCAS alerts at DCA were "Secret Service and U.S. Navy activity" and "the two agencies “improperly” testing counter-drone technology near the airport on March 1." per US Senator. https://www.flyingmag.com/false-alerts-dca-cause/
TCAS alerts at DCA were "Secret Service and U.S. Navy activity" and "the two agencies “improperly” testing counter-drone technology near the airport on March 1." per US Senator. https://www.flyingmag.com/false-alerts-dca-cause/
"...He added that the Navy was using the same spectrum band as TCAS, causing the false alerts. The FAA had previously warned the Navy and Secret Service against using this same band...."