Irkut MC-21 missing ultimate load test

April 05, 2017, ©. Leeham Co: United Aircraft's IRKUT MC-21 passed 90% of the static Ultimate load test end February at the TsAGI test institute in Moscow reports ATO.RU. But the aircraft failed the 100% test.

The test simulates a load which is 150% higher than the highest load that the aircraft should be subject to in its operational life. The test failure 

https://leehamnews.com/2017/04/05/irkut-mc-21-missing-ultimate-load-test/