posted on Dec, 12 2015 @ 05:24 PM
For an engine, Boeing went with the CFM International Leap-1B. The Leap-1B engine uses lessons from the GE90/GENX for the core, and the CFM56 for the
rest of the engine. It is also the first to use large scale CMCs. According to CFM, it takes 150,000 miles of carbon fiber to create one fan blade,
but it's capable of holding the weight of an aircraft the size of an A350 or 787.
By combining the GE90 core, and the CFM56 engine, CFM has managed to get a 15% decrease in fuel burn, over the CFM56-7BE, while having the same
reliability rate as the older engine. The -7BE has a 2% fuel burn improvement over the standard -7B and up to a 4% reduction in maintenance cost.
The -7B is used on the C-40B, P-8A, and 737 AEW&C aircraft. This is pretty significant, since in 2007, CFM made changes to the -7B that improved
maintenance costs by 5-15% depending on thrust rating. The -7BE has an additional decrease in maintenance costs above that, depending on thrust
rating. The Leap 1 family is expected to have a 99.98% dispatch rating.