 Three production Su @-@ 27Ms were completed and delivered to VVS in 1996 for testing . They were operated by 929th State Flight Test Center ( abbreviated as <unk> in Russian ) at <unk> Air Base , Akhtubinsk , performing weapons trials . During one such flights , a weapon pylon , to which a bomb and rocket were attached , fell into a village in Ryazan ; nobody was hurt . In 2001 , the Air Force decided that the aerobatics team Russian Knights would receive several Su @-@ 27Ms , presumably from <unk> and Sukhoi . After pilots from the team undertook conversion course at <unk> AB , the first of five aircraft was delivered to the team in July 2003 . It was expected that the Su @-@ 27Ms would enhance the flying repertoire of their new owners , but due to various reasons , they were used as a source of spare parts for other aircraft in the demonstration fleet . 
