Eurowings Flight No: EW 20 Cologne/Berlin Tegel Airbus 319-100 Reg: D-AGWJ Reported as ‘AN AIR CONDITIONING PROBLEM’ The aircraft returned to Cologne 20 minutes after take off. Passenger Peter M. Meyer reported the aircraft returned to Cologne due to a defect of the air conditioning system and posted a photograph. This photograph taken by Mr. Meyer shows a crew member wearing a smoke hood. It is standard procedure for crew to don a smoke hood in the event of Fire, Smoke or Fumes.