This and CCCP-11719 shut down Heathrow airspace for an hour doing low level circuits and approaches until a Russian speaking BEA employee was brought to the control tower to translate. They were believed to be Soviet Air Force aircraft with unknown constructors numbers and were on the way to RAF Hullavington supporting an aerobatic competition. This airframe is CCCP-11110 (1), a Factory #84 aircraft with unknown c/n, but higher than 5343401. CCCP-11110 (2) was c/n 01347902 (built in 1971).