CFM International (CFMI) said the 'eCore 1', a demonstrator core for the LEAP-X engine programme, is to begin the second test phase in 1Q 2010. The engine core features an eight-stage high-pressure compressor, an advanced version of the TAPS II lean burn, low emissions combustor, and a single-stage high-pressure turbine. These tests will focus on aerodynamic performance parameters; the aeromechanical properties of the blades and how they respond to vibration and natural frequencies; and operability to ensure the engine maintains stall-free operation. All of the data collected from these tests will feed into 'eCore 2', which features a two-stage turbine and is on schedule to begin testing in mid-2011.