Agusta A109E crash near In flight North of Seaton, Cornwall, United Kingdom

During a post-maintenance flight, the left cockpit door window separated from the helicopter. The window had been removed and reinstalled during recent maintenance. The investigation determined that insufficient adhesive had been applied to the rubber retaining seal. In addition, liberal application of high-concentration soap solution during reinstallation likely contributed to the loss of the window, by reducing the frictional ability of the rubber seal to retain the window. As a result of the findings of this investigation, the maintenance organisation has taken four safety actions. Agusta A109E, G-ETPI 01-20