Loss of separation On 27 July 2009, a Cessna 525 being operated by Stuttgart-based company Eisele Flugdienst and departing from London City on a passenger charter flight failed to comply with the initial 3000 ft QNH SID Stop altitude and at 4000 ft QNH in day VMC came into close proximity on an almost reciprocal heading with a Boeing 777-300 being operated by Turkish Airlines on a scheduled passenger flight from Istanbul to London Heathrow. Actual minimum separation was approximately 0.5nm laterally and estimated at between 100 ft and 200 ft vertically. There were no injuries to any of the 248 occupants of the Boeing 777 or to the 3 occupants of the Cessna.