The MiG-21UM was the final two ¨Cseater version developed from the E-6 UM prototype. It was practically a ¡°US¡± airframe with improved instruments and avionics up to the ¡°M¡±and ¡°MF¡± standards. The new ejection seats were installed, the KM-1Ufor the front cockpit and KM-1I for the rear cockpit. The distinguish mark is the UHF aerial on the dorsal spine in front of the fin, the attitude sensor on the front nose section and forward ¨Cview instructor¡¯s periscope installed on the rear canopy frame. This foldable periscope was added because of instructor¡¯s requirements to look straight forward during take-off and control the aircraft when it is necessary.
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