The engine run test began with the Auxiliary Power System providing power to start the first of four GE GEnx-2B engines. The remaining three engines were started using the cross-bleed function. Basic systems checks continued throughout the test. The engines were powered down and inspected and will be restarted following a technical review. The team completed a vibration check and monitored the shutdown logic to ensure it functioned as expected.  

The GEnx-2B engine is optimized for the 747-8. The new engine contributes to a reduction in fuel burn, emissions and noise, which gives customers the lowest operating costs and best economics of any large passenger airplane while providing enhanced environmental performance. 

The Boeing 747-8 is a wide-body commercial jet airliner being developed by Boeing Commercial Airplanes. Officially announced in 2005, the 747-8 is the fourth-generation Boeing 747 version, with lengthened fuselage, redesigned wings and improved efficiency. The 747-8 is the largest 747 version, the largest commercial aircraft built in the United States, and the longest passenger aircraft in the world.