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CFM International LEAP

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LEAP
Mockup of a LEAP-X, the early code name of the engine
Type Turbofan
National origin France/United States
Manufacturer CFM International
First run 4 September 2013[1]
Major applications Airbus A320neo family
Boeing 737 MAX
Comac C919
Number built 2,516 (June 2019)[a]
Developed from CFM International CFM56
General Electric GEnx

The CFM International LEAP ("Leading Edge Aviation Propulsion") is a high-bypass turbofan engine produced by CFM International, a 50–50 joint venture between American GE Aerospace and French Safran Aircraft Engines. It is the successor of the CFM56 and competes with the Pratt & Whitney PW1000G to power narrow-body aircraft.

Design

[edit]

The LEAP's basic architecture includes a scaled-down version of Safran's low-pressure turbine used on the GEnx engine. The fan has flexible blades manufactured by a resin transfer molding process, which are designed to untwist as the fan's rotational speed increases. While the LEAP is designed to operate at a higher pressure than the CFM56 (which is partly why it is more efficient), CFM plans to set the operating pressure lower than the maximum to maximize the engine's service life and reliability.[6] Currently proposed for the LEAP is a greater use of composite materials, a blisk fan in the compressor, a second-generation Twin Annular Pre-mixing Swirler (TAPS II) combustor, and a bypass ratio around 10–11:1.

The high-pressure (HP) compressor operates at up to a 22:1 compression ratio, which is roughly double the corresponding value for the CFM56's HP compressor.[7]

CFM uses ceramic matrix composites (CMC) to build the turbine shrouds.[8] These technological advances are projected to produce 16% lower fuel consumption.[9][10] Reliability is also supported by use of an eductor-based oil cooling system similar to that of the GEnx, featuring coolers mounted on the inner lining of the fan duct. According to Aviation Week's article, "The eductor device produces a venturi effect, which ensures a positive pressure to keep oil in the lower internal sump."[6] The engine has some of the first FAA-approved 3D-printed components.[11]

The LEAP-1C for the Chinese-built Comac C919 reportedly lacks many of the improvements of the other LEAP models over concerns that the technology could be stolen and put into the CJ-1000A engine being developed by another state-owned manufacturer, the Aero Engine Corporation of China. Experts believe that the LEAP-1C is actually an upgraded version of the prior-generation CFM56.[12] Compared to the similarly sized LEAP-1A, the -1C is heavier and produces less thrust.[13]

Development

[edit]
18 blade fan

The LEAP[14] incorporates technologies that CFM developed as part of the LEAP56 technology acquisition program, which CFM launched in 2005.[15] The engine was officially launched as LEAP-X on 13 July 2008.[9] It is intended to be a successor to the CFM56.

In 2009, COMAC selected the LEAP engine for the C919.[16] The aircraft was due to begin testing in 2016.[17] 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.[1][18] The first engine entering the test program reached and sustained 33,000 lbf (150 kN) of thrust, required to satisfy the highest rating for the Airbus A321neo. The same engine ultimately reached 35,000 lbf (160 kN) of thrust in test runs.[6]

The LEAP-1A was tested on GE's 747-400 flying test platform.[19]

CFM carried out the first test flight of a LEAP-1C in Victorville, California, with the engine mounted on the company's Boeing 747 flying testbed aircraft on 6 October 2014. The -1C version features a thrust reverser equipped with a one-piece O-ring replacing a two-piece door. The thrust reverser is deployed by the O-ring sliding aft, reducing the drag that was induced by the older design and improving efficiency.[20]

In April 2015, it was reported that the LEAP-1B was suffering up to a 5% shortfall on its promised reduction in fuel consumption.[21]

It obtained its 180-minute ETOPS approval from the U.S. Federal Aviation Administration and the European Aviation Safety Agency on 19 June 2017.[22]

Orders

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On 20 July 2011, American Airlines announced that it planned to purchase 100 Boeing 737 aircraft featuring the LEAP-1B engine.[23] The project was approved by Boeing on 30 August 2011, as the Boeing 737 MAX.[24][25] Southwest Airlines is the launch customer of the 737 MAX with a firm order of 150 aircraft.[26]

The list price of a LEAP-1A is US$14.5 million,[27] and US$14.5 million for a LEAP-1B.[28]

CFM International offers rate-per-flight-hour support agreements (also known as "power by the hour" agreements) for the engine. For a LEAP-1A engine, costs are around US$3,039 per engine, per day, compared to US$1,852 per engine, per day for the prior-generation CFM56.[29]

In 2016, CFM booked 1,801 orders, and the LEAP backlog stood at more than 12,200, worth more than US$170 billion at list price.[2]

By July 2018, the LEAP had an eight-year backlog with 16,300 sales. At that time, more LEAPs were produced in the five years it was on sale than CFM56s in 25 years.[3] It is the second-most ordered jet engine behind the 44-year-old CFM56,[30] which achieved 35,500 orders.[3] Also, on the A320neo, where the engine competes head-to-head with the Pratt & Whitney PW1000G, the LEAP had captured a 59% market share in July 2018. By comparison, the CFM56 had a 60% share of the prior-generation A320ceo market.[30][31]

In 2020, GE Aviation reported that CFM had lost 1,900 orders for LEAP engines worth US$13.9 billion (US$7.3 million each), reducing the backlog value to US$259 billion. More than 1,000 cancellations came from Boeing 737 MAX orders being canceled among the Boeing 737 MAX groundings, while the remainder came from the impact of the COVID-19 pandemic on aviation.[32]

Production

[edit]
side view with cutaways

In 2016, the engine was introduced in August on the Airbus A320neo with Pegasus Airlines and CFM delivered 77 LEAP.[2] With the 737 MAX introduction, CFM delivered 257 LEAPs in the first three quarters of 2017, including 110 in the third: 49 to Airbus and 61 to Boeing, and targets 450 in the year.[33] CFM was to produce 1,200 engines in 2018, 1,900 in 2019, and 2,100 in 2020.[34] This is compared to the 1,700 CFM56 produced in 2016.[35]

To cope with the demand, CFM is duplicating supply sources on 80% of parts and even subdivide assembly sites, already shared between GE and Safran.[36] GE assembles its production in Lafayette, Indiana, US in addition to its previous Durham, North Carolina, US facility.[36] As more than 75% of the engine comes from suppliers, critical parts suppliers pass “run-rate stress tests” lasting two to 12 weeks.[36] Pratt & Whitney acknowledges a production ramp-up bottleneck on its rival PW1100G geared turbofan including a critical shortage of the unique aluminium-titanium fan blade, hitting the Airbus A320neo and the Bombardier CSeries deliveries.[36] Safran assembles its production in Villaroche, France, Safran and GE each assemble half of the annual volume.[37] Mecachrome plan to produce 120,000–130,000 LEAP turbine blades in 2018 up from 50,000 in 2017.[38]

In mid-June 2018, deliveries remained four to five weeks behind schedule, down from six, and should catch up in the fourth quarter as the quality variation of castings and forgings improves.[3] The production has no single manufacturing choke point by selecting multiple suppliers for every critical part.[3]

From 460 in 2017, 1,100 LEAPs should be built in 2018, along with 1,050 CFM56s, as it encountered unexpected sales, to pass the record production of 1,900 engines in 2017.[3] It will stay at over 2,000 engines per year as 1,800 LEAPs should be produced in 2019, while CFM56 production will drop, then 2,000 in 2020.[3] In 2018, 1,118 engines were delivered.[4]

Over the first half of 2019, CFM revenues were up by 23% to €5.9 billion with 1,119 engine deliveries; declining sales of CFM56 (258 sold), more than offset by LEAP (861 sold).[5] Recurring operating income rose by 34% to €1.2 billion, but was reduced by €107 million (US$118 million) due to the negative margins and initial costs of LEAP production, before a positive contribution expected in the second half.[5] Revenues should grow by 15% in 2019 but free cash flow depends on the return to service of the grounded 737 MAX.[5]

In 2019, LEAP production rose to 1,736 engines, and orders and commitments reached 1,968 amid the 737 MAX groundings, compared with 3,211 for 2018, for a stable backlog of 15,614 (compared to 15,620).[39] CFM expects to produce 1,400 LEAP engines in 2020, including an average of 10 weekly LEAP-1Bs for the Boeing 737 Max.[39] By March 2022, CFM intended to output 2,000 engines in 2023, up from 845 deliveries in 2021.[40] In 2023, CFM booked over 2,500 orders, resulting in a backlog of 10,675, delivered 1,570 Leap engines, up by 38% from 1,136 in 2022, and was expecting 20-25% more deliveries for 2024.[41]

The troubled introduction of the Pratt & Whitney PW1100G on the A320neo has motivated customers to choose LEAP engines. LEAP market share rose from 55% to 60% in 2016, but orders for 1,523 aircraft (29%) had not specified which engine would be chosen.[42] From January through early August 2017, 39 PW1100G engines versus 396 CFM LEAP engines were chosen.[42] By 2024, the LEAP was selected for 75% of the A320neo orders.[41] As an example of PW1100G reliability issues, 9% of LEAP-powered A320neos were out of service for at least one week in July 2017, compared with 46% of those using the PW1100G.[42]

Operations

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The Boeing 737 MAX LEAP-1B started revenue service in May 2017 with Malindo Air with 8 hours of daily operation, while the A320neo LEAP-1A surpassed 10 hours per day by July. Safran discovered a production quality defect on LEAP-1B low-pressure turbine disks during assembly for possibly 30 engines, and CFM is working to minimize flight-test and customer-delivery disruptions.[43]

In early October 2017, an exhaust gas temperature shift was noticed during a flight and a CMC shroud coating in the HP turbine was seen flaking off in a borescope inspection, creating a leaking gap: eight in-service engines are seeing their coating replaced.[44] Safran provisioned €50 million (US$58 million) to troubleshoot in-service engines, including potentially LEAP-1Bs.[33] Forty LEAP-1A were replaced and the part should be replaced in over 500 in-service engines, while shipments are four weeks behind schedule.[45] Deliveries with the permanent CMC environmental-barrier coating fix began in June.[46]

On 26 March 2019, due to the Boeing 737 MAX groundings, Southwest Airlines flight 8701 (737 MAX 8) took off from Orlando International Airport for a ferry flight to storage without passengers, but soon after problems with one of the engines caused an emergency landing at the same airport. Southwest then inspected 12 LEAP engines, and two other airlines also inspected their engines.[47] CFM recommended replacing the fuel nozzles more often due to coking, a carbon buildup.[48]

Applications

[edit]
CFM International LEAP variants[49]
Model Application Thrust range Introduction
-1A Airbus A320neo family 24,500–35,000 lbf (109–156 kN) 2 August 2016[50]
-1B Boeing 737 MAX 23,000–29,000 lbf (100–130 kN) 22 May 2017[51]
-1C Comac C919 27,980–30,000 lbf (124.5–133.4 kN) 28 May 2023[52]

Specifications

[edit]
The LEAP Family
Model LEAP-1A[13] LEAP-1B[53] LEAP-1C[13]
Configuration Twin-spool, high bypass turbofan
Compressor 1 fan, 3-stage LP, 10-stage HP[54]
Combustor TAPS II (second-generation Twin-Annular, Pre-mixing Swirler)[49]
Turbine 2-stage HP, 7-stage (-1B: 5-stage) LP[55]
Overall pressure ratio 40:1[54] (50:1 at top of climb)
TSFC at cruise 0.51 lb/lbf/h (14.4 g/kN/s)[56] 0.53 lb/lbf/h (15.0 g/kN/s)[56] 0.51 lb/lbf/h (14.4 g/kN/s)[57]
Fan diameter[54] 78 in (198 cm) 69.4 in (176 cm) 77 in (196 cm)[58]
Bypass ratio[54] 11:1 9:1 11:1
Length 3.328 m (131.0 in)[b] 3.147 m (123.9 in) 4.505 m (177.4 in)[c]
Max. width 2.543 m (100.1 in) 2.421 m (95.3 in) 2.659 m (104.7 in)
Max. height 2.362 m (93.0 in) 2.256 m (88.8 in) 2.714 m (106.9 in)
Max. weight 3,153 kg (6,951 lb) (Wet) 2,780 kg (6,130 lb) (Dry) 3,935 kg (8,675 lb) (Wet)
Max. take-off thrust 143.05 kN (32,160 lbf) 130.41 kN (29,320 lbf) 137.14 kN (30,830 lbf)
Max. continuous thrust 140.96 kN (31,690 lbf) 127.62 kN (28,690 lbf) 133.22 kN (29,950 lbf)
Max. rpm LP: 3,894
HP: 19,391		 LP: 4,586
HP: 20,171		 LP: 3,894
HP: 19,391
  1. ^ 77 delivered in 2016,[2] 460 in 2017,[3] 1,118 in 2018,[4] 861 in H1 2019.[5]
  2. ^ fan case forward flange to turbine rear frame aft flange
  3. ^ fan cowl hinge beam front to centre vent tube end
Thrust ratings[13][53]
Variant Take-Off Thrust Max. Continuous Application
-1A23 106.80 kN (24,010 lbf) 104.58 kN (23,510 lbf) A319
-1A24 106.80 kN (24,010 lbf) 106.76 kN (24,000 lbf) A319, A320
-1A26 120.64 kN (27,120 lbf) 118.68 kN (26,680 lbf) A319, A320
-1A29 130.29 kN (29,290 lbf) 118.68 kN (26,680 lbf) A320
-1A30 143.05 kN (32,160 lbf) 140.96 kN (31,690 lbf) A321
-1A32 A321
-1A33 A321
-1A35A A321
-1B25 119.15 kN (26,790 lbf) 115.47 kN (25,960 lbf) 737-8
-1B27 124.71 kN (28,040 lbf) 121.31 kN (27,270 lbf) 737-8, 737-9
-1B28 130.41 kN (29,320 lbf) 127.62 kN (28,690 lbf) 737-8, 737-9
-1C28 129.98 kN (29,220 lbf) 127.93 kN (28,760 lbf) C919
-1C30 137.14 kN (30,830 lbf) 133.22 kN (29,950 lbf) C919

See also

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Related development

Comparable engines

Related lists

References

[edit]
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