Written by Source: Aerossurance
On 27 June 2016, Air France Airbus A319 F-GRHX, with 132 people onboard, passed Airbus Helicopters Cougar F-ZWBS with a minimum separation of 0.2 nm horizontally and 240 ft vertically on approach to Marseille-Provence Airport (close to the points marked ’10’ below). ATC Busy, Failed Transponder and Helicopter Filtered From Radar.
See a summary case study from Aerossurance at the LINK