Background
On 12 January 2022, a Cessna 525 CJ, registered F-HGPG and operated by Valljet, was conducting a passenger commercial air transport flight from Paris–Le Bourget Airport to Geneva Airport. The aircraft carried two pilots and two passengers. Simultaneously, an Embraer 170, registered F-HBXG and operated by HOP!, was also on a passenger commercial flight with two pilots, two cabin crew members, and 42 passengers.
Incident
At 09:19, while en route south of Auxerre (Yonne), a fault occurred on the air data system of F-HGPG. This fault led to a proximity event between the two aircraft. Anti-collision systems did not activate during this event. No injuries to persons or damage to either aircraft were reported.
Investigation
The French Civil Aviation Safety Investigation Authority (BEA) conducted an investigation into the serious incident. The BEA's report, published in July 2023, identified the event as involving an air data system fault and proximity without activation of anti-collision systems. The report number is BEA2022-0008.