Leuchars Station (IATA: ADX, ICAO: EGQL) is a British Army installation located in Leuchars, Fife, on the east coast of Scotland, near to the historic town of St Andrews. Formerly RAF Leuchars, it was the second most northerly air defence station in the United Kingdom (the most northerly being RAF Lossiemouth). The station ceased to be an RAF station in April 2015 when control of the site was transferred to the Army.