The second phase of GE9X CMC (ceramic matrix composite) component testing in a GEnx demonstrator engine is complete, with the CMCs continuing to be the clear cool winner. The demonstrator engine accumulated 1,800 cycles in the latest round of tests, which included exposure to harsh environmental conditions of dust and debris. The level of debris exposure was equivalent to about 3,000 take-off and landing operation cycles. The GE9X engine will power Boeing's 777X aircraft.