10-yr breather: MiG-21 can fly 1,000 hrs extra
India found that its MiG-21 Bis fleet can still fly 1,000 hours past the certified 2,400 hours.
The National Aerospace Laboratories (NAL) flew a MiG-21 that had completed 2,400 hours and found that fatigue cracks appear only after 1,000 hours of flying.
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