From batch 10 to batch 19 , the large - chord vertical stabiliser first seen on the MiG - 21FL was introduced .
The aircraft retained the SK ejection seat and one - piece , forward - opening canopy of the MiG - 21PF .
From batch 10 to batch 19 , the large - chord vertical stabiliser first seen on the MiG - 21FL was introduced , but the aircraft retained the SK ejection seat and one - piece , forward - opening canopy of the MiG - 21PF .