The RP-22 onboard radar was placed in the nose cone of MiG-21bis fighters. Its task was to recognize any aircraft from 20kms and to lock onto them from 10kms. It was used to direct the R-3R (NATO code: AA-2 Atoll C) air toair guided missile. The ‘bis’ version of the MiG-21 differed to the MF in that, besides its larger capacity spine tank, its on-board radar was exactly 50% more effective. The People's Army introduced the jet propelled model in 1975, a total of 62, 75A and 75AP models served in Hungary. It was retired in 2000.