BTR Aerospace Group was renamed by BTR plc after the acquisition of the Dunlop Aviation Division from Dunlop Rubber in 1985. It was a group of four companies: * Standard Aero, in Canada * Dunlop Aviation Division * Aero Engine Equipment * Dunlop Precision Rubber In 1996, Dunlop Aircraft Tyres Limited was sold by BTR plc to form an independent company. It is based at Fort Dunlop, Birmingham, England. In July 1998, Doughty Hanson & Co purchased BTR Aerospace Group and renamed it Dunlop Standard Aerospace Group.