Vienne, France · 2007-07-14 · from the GEIPAN archive
On July 14, 2007 at 14:35 UTC, the captain of an Air France flight reports having a TCAS alert indicating traffic very close to the aircraft. On the screens, the pilots see a red target located 30 nautical miles (55 km) away and 300 feet (100 m) above the aircraft. But no object will be seen by the pilots despite exceptional visibility. Air traffic control will detect no unknown traffic on the radar screen. The preliminary investigation conducted by the Bureau Enquête Analyse at Le Bourget for the DGAC concluded that the observed phenomenon was due to false echoes. The expert analysis carried out for GEIPAN highlights a probable malfunction of an onboard instrument: the traffic alert and collision avoidance system (English name TCAS).
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This is an official case file of GEIPAN, the French space agency's unidentified aerospace phenomena office, machine translated from French. The original text and the full investigation file are at geipan.fr. We reproduce it with thanks and remove anything on request.
Anomaly