CFM International LEAP
|Mockup of a LEAP-X|
|National origin||France/United States|
|First run||4 September 2013 (LEAP-1A) |
|Major applications||Airbus A320neo
Boeing 737 MAX
|Developed from||General Electric GEnx|
The CFM International LEAP (formerly called LEAP-X) is a high-bypass turbofan engine. It is currently under development by CFM International, a 50-50 joint venture company between GE Aviation of the United States and Snecma of France.
Design and development
The LEAP ("Leading Edge Aviation Propulsion") incorporates technologies that CFM developed as part of the LEAP56 technology acquisition program, which CFM launched in 2005. The engine was officially launched as "LEAP-X" on 13 July 2008. It is intended to be a successor to the CFM56-5B and CFM56-7B. Currently proposed for the LEAP is a greater use of composite materials, a blisk fan in the compressor, a second-generation Twin Annular Pre Swirl (TAPS II) combustor, a bypass ratio around 10-11:1, and 16% lower fuel consumption.
In total, 28 test engines will be used by CFM to achieve engine certification, and 32 others will be used by Airbus, Boeing and COMAC for aircraft certification and test programs. 
The company expects to receive certification for the first LEAP, the LEAP-1C, for China's 150-seat COMAC C919 twinjet. The aircraft is due to enter service in 2016. The engine will also be deployed in the same year on the new Airbus A320neo variant.
On July 20, 2011, American Airlines announced that it planned to purchase 100 Boeing 737 aircraft featuring the LEAP-1B engine. The project was approved by Boeing on August 30, 2011 as the Boeing 737 MAX. Southwest Airlines is the launch customer of the 737 MAX with a firm order of 150 aircraft.
Data from CFM International
- Type: Twin-spool, high bypass turbofan
- Diameter: 1.76 - 2.00 m
- Dry weight:
- Compressor: Single-stage fan, 3-stage low pressure compressor, 10-stage high pressure compressor
- Combustors: annular
- Turbine: Two-stage high pressure turbine, 7-stage low pressure turbine
- Maximum thrust: 18,000-35,000 lbf., ca. 25,000-30,000lbf. for C919
- Overall pressure ratio: 50:1 (Top-of-Climb)
- Bypass ratio: 10:1
- Power-to-weight ratio:
|Fan diameter ||78.7 in (2.00 m)||68.4 in (1.74 m)||75 in (1.9 m)|
|Bypass ratio (estimated)||~10:1||~8.5:1||~9.2:1|
|Thrust ||24,500–32,900 lbf (109–146 kN)||23,000–28,000 lbf (100–120 kN)||27,980–30,000 lbf (124.5–130 kN)|
|Fuel burn (vs. current CFM56-7BE engine) ||~ -15%||~ -15%||~ -15%|
|Stage count ||1-3-10-2-7||1-3-10-2-5||1-3-10-2-7|
|Application ||Airbus A320neo family||Boeing 737 MAX family||COMAC C919|
|Entry into service ||2016||2017||2016|
- Related development
- Comparable engines
- Related lists
- "CFM launches a new era as first LEAP engine begins ground testing". CFM International. 2013-09-06. Retrieved 2013-09-07.
- LEAP Turbofan Engine, History
- CFM Laying the Technology Foundation for the Future. CFM International
- "CFM Unveils New LEAP-X Engine". CFM International. 2008-07-13. Retrieved 2008-07-16.
- New engines: flurry of activity despite downturn
- LEAP-X: Redefining Turbofan Engines for Narrowbody Aircraft
- CFM International to provide engines for COMAC's C919
- CFM to finish Leap core testing by mid-May
- Airbus A320neo story FlightGlobal
- "Boeing and American Airlines Agree on Order for up to 300 Airplanes - Jul 20, 2011". Boeing.mediaroom.com. July 20, 2011. Retrieved May 31, 2013.
- Boeing Confirms Duopoly With Airbus Announcing Re-Engining Of 737. Forbes
- Boeing rendering illustrates major changes to 737NE. flightglobal.com
- "Southwest Airlines Will Become Launch Customer for the New Boeing 737 Max Aircraft - Southwest Airlines Newsroom". Swamedia.com. December 13, 2011. Retrieved May 31, 2013.
- "Flight - Airline Industry news, aviation jobs & airline recruitment". Flightglobal.com. Retrieved May 31, 2013.
- "The Leap Engine". Cfmaeroengines.com. Retrieved May 31, 2013.
- 1 hour ago (September 12, 2012). "Aviators". Denisomoya.blogspot.co.uk. Retrieved May 31, 2013.
- November 9, 2011 (November 9, 2011). "Comparing the new technology Narrow-body engines: GTF vs LEAP maintenance costs". Airinsight.com. Retrieved May 31, 2013.
- "CFM To Release A320NEO Leap Engine Final Design By Year-End". Aviationweek.com. November 7, 2012. Retrieved May 31, 2013.
|Wikimedia Commons has media related to CFM International LEAP-X.|
- CFM LEAP page
- CFM Unveils New LEAP-X Engine
- CFM ready to advance LEAP-X schedule; opens way for 737RE
- A320 re-engine decision in 2010
- Plane makers switch to cleaner engines