On 29 December 2006, a B737-700 (G-EZJL) being operated by Easyjet on a scheduled passenger flight from Geneva to Luton as EZY 2076 cleared for take off did not reject its take off when requested to do so as ATC were also instructing a FOKKER F100, (PH-OFF) being operated by KLM CityHopper under call sign KLM 57W to make a non standard go around and the two aircraft subsequently lost separation with a minimum of 1nm horizontally and 300 feet vertically in night Instrument Meteorological Conditions (IMC).
An Investigation was carried out by the Swiss Air Accident Investigation Bureau, primarily using radar recordings.
The instruction to the 737 to reject the take off was found to have been given 20 seconds after the pilot had confirmed that take-off was being commenced in response to a request from TWR for an immediate take off after the initial clearance had still not been actioned. Radar recordings showed that when the instruction was given, "the aircraft was approximately 400 m from the threshold of runway 23" and its ground speed was 74 knots. Given this relatively low speed, the Investigation considered that it was "surprising that the crew....did not cancel its take-off". The pilot stated that he had been aware of the F100 from his TCAS display and "
When giving the go around as the F100 approached the ILS DA, TWR instructed it to turn left immediately onto 050º because of the traffic which had taken off in front of it". It was found that once the left turn had been made, the flight paths of the two aircraft had diverged with both lateral and vertical separation between them increasing.
It was considered that "the fact that at no time during the approach by (the business jet) were the crew informed of the exit taxiway to use after landing" certainly contributed to their slow action in this respect, which had delayed the issue of take off clearance to the 737.
The formally documented Cause of the Serious Incident was stated as:
"Critical convergence between an aircraft in the final approach phase and an aircraft taking off, following inappropriate traffic management and the non-compliance with an order to abort take-off given by aerodrome control".
The Final Report was published on 9 April 2008. No Safety Recommendations were made.