Russia’s TsAGI Central Aerohydrodynamic Institute in Moscow has completed residual-strength tests on a prototype composite wingbox for United Aircraft’s (UAC) MS-21 short/medium-airliner. The test to failure measured strength remaining in the wing box after completing 18 months and 120,000 cycles of endurance testing, equivalent to two design lives. The results confirmed that damage after cyclic testing was consistent with design standards, says AeroComposite’s chief designer Sergei ...


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