lateral analysis(Lateral Analysis (also called Rotordynamics Analysis) simulates the rotating system, calculates the critical speeds, predicts vibration amplitudes, and provides recommendations to reduce vibration risks.betamachinery.comVarelash)
uncontained engine rotor failure UERF 1:20 regulation(Civil Certification Regulation requests aircraft design to be such that the possibility to have a catastrophic event after an engine uncontained rotor failure event is limited to 1/20th for the whole aircraft taken into account all debris potential trajectories. Svetozar)