Mass failures in the anti-collision warning system (TCAS) have been recorded at Pulkovo Airport in St. Petersburg, causing concern among pilots of Russian and foreign airlines. According to the Telegram channel Baza, over the past week, more than 160 crews operating flights to Pulkovo reported false alarms of the system, which records non-existent threats of collisions. The problems began in late May, but their peak coincided with preparations for the St. Petersburg International Economic Forum (SPIEF), which is taking place from June 18 to 21. Preliminary, the anomalies are associated with the intensified work of Russian electronic warfare (EW) systems.

Pilots report that when approaching or taking off from Pulkovo, TCAS detects numerous unidentified objects, which appear on radar as chaotically moving blips with no altitude data. In most cases, the system issues a voice warning of a potential threat, but in a number of incidents, the real danger mode is triggered, requiring crews to immediately climb or descend. Such commands take precedence over air traffic controllers' instructions, which creates the risk of abnormal situations. Controllers do not see foreign objects on their monitors, which indicates that the signals are false.