sentences:  Appraisal by Royal Air Force acceptance personnel criticised the Brewster Buffalo on numerous points, including lack of armament and pilot armour, poor high-altitude performance, engine overheating, unreliability and cockpit controls, while it was praised for its handling, roomy cockpit and visibility.The aircraft were deemed unsuitable for European conditions and Hawker Hurricanes replaced them from November 1940.The squadron became operational at RAF Kirton-in-Lindsey on 5 February 1941 and moved in April to RAF Martlesham Heath in Suffolk for operations over Europe.