flyingchanges and
funfly:
I recall video footage of the testing of RR engines where this very feature is demonstrated as a test that the engine has to pass before certification....
N1 only....
True it was N1, but the salient fact is that it's a BLADE (airfoil) deliberately released from the fan disk in the referenced video. All new engine models are required to endure this test; The containment for the relatively lightweight blade is established technology. But a DISC failure is several orders of magnitude worse, and containment quite impractical in a flying machine.