come after NAL's successful completion of Full-Scale Fatigue Testing (FSFT) on
the MiG 21 Bison Airframe C-2090. With this the IAF's Total
Technical Life Enhancement (TTLE) project has come to an end.
Force's Bison fleet is of 150 aircraft which originally had 2400 hours of flying
as per the Russian certification, however the Air Force went for the Life
Enhancement Test at NAL."
So thats one airframe that has been wringed out in fatigue tests.