A "cropped fan" derivative of the -2, the -3 engine has a smaller fan diameter at 60 in (1.5 m) but retains the original basic engine layout. The program focused on developing a large number of new technologies for the theoretical future engine, not necessarily creating an all-new design. "G.E.-SNECMA Deal: U.S.-French Dispute Is Obscured". [2], The work split between the two companies gave GE responsibility for the high-pressure compressor (HPC), the combustor, and the high-pressure turbine (HPT); SNECMA was responsible for the fan, the low-pressure compressor (LPC), and the low-pressure turbine (LPT). It is the most numerous engine supplied to Airbus. [43], The CFM56 fan features dovetailed fan blades which allows them to be replaced without removing the entire engine, and GE/SNECMA claim that the CFM56 was the first engine to have that capability.

"Report on the accident to Boeing 737-400, G-OBME, near Kegworth, Leicestershire on 8 January 1989" (1990). [nb 3][17], After testing the engine for several years, both in the air and on the ground, CFMI searched for customers outside of a possible AMST contract. [2], By the end of the 1970s, airlines were considering upgrading their aging Douglas DC-8 aircraft as an alternative to buying new quieter and more efficient aircraft. Noise-reducing, Stator vane cooling air ducts circle the iridescent shroud of a CFM56-7B26 turbine, Front view of an A319-112 CFM56-5B6 with its fan removed.

While work proceeded smoothly, the international arrangement led to unique working conditions. [14], The engine flew for the first time in February 1977 when it replaced one of the four Pratt & Whitney JT8D engines on the McDonnell Douglas YC-15, an entrant in the Air Force's Advanced Medium STOL Transport (AMST) competition. [52], Unlike every other variant of the CFM56, the -5C features a mixed-exhaust nozzle,[nb 1] which offers slightly higher efficiency.

Analysis revealed that the fan was being subjected to high-cycle fatigue stresses worse than expected and also more severe than tested for certification; these higher stresses caused the blade to fracture. [39], The high-pressure compressor-HPC, that was at the center of the original export controversy, features nine stages in each variant of the CFM56. The second engine was then shipped to France and first ran there on 13 December 1974. GE-SNECMA Jet Engine Joint Venture (1972). Samuelson, Robert (1972). The CFM56-2-powered E-3 also became the standard configuration for aircraft purchased by the British and French. This upgrade, announced with improvements to Boeing's 737 Next Generation, further enhances the high- and low-pressure turbines with better aerodynamics, as well as improving engine cooling, and aims to reduce overall part count. [46], The first derivative of the CFM56 series, the CFM56-3 is designed for Boeing 737 Classic series (737-300/-400/-500), with static thrust ratings from 18,500 to 23,500 lbf (82.3 to 105 kN). [25], Since the small initial launch order for twenty 737-300s split between two airlines,[2] over 5,000 Boeing 737 aircraft had been delivered with CFM56 turbofans by April 2010, proof of the engine's adaptability.[26]. This type of thrust reverse consists of sleeves that slide back to expose mesh-like cascades and blocker doors that block the bypass air flow. For example, both companies had assembly lines, some engines were assembled and tested in the U.S. and others in France. The engines are assembled by GE in Evendale, Ohio, and by SNECMA in Villaroche in France.

The air passes through internal channels in each blade and ejects at the leading and trailing edges. "Plan to Reengine 707 With CFM56 Suspended". The new components also reduced engine wear, lowering maintenance costs by about 5%. Updated: 23 May 2010. However, the company was faced with a dilemma when the United States Air Force (USAF) announced its Advanced Medium STOL Transport (AMST) project in 1972 which included funding for the development of a 10-ton engine – either to build a "limited" technology 10-ton engine with SNECMA, or a similar engine with "advanced" technology on their own.

National Transportation Safety Board. "GE, French Firm Get Jet Engines Contract". google_ad_height = 600;

The CFM56-5 series is designed for the Airbus aircraft and has a very wide thrust rating of between 22,000 and 34,000 lbf (97.9 and 151 kN). It also powers the military versions of the Next-Generation 737, the C-40 Clipper, the P-8 Poseidon, and Boeing 737 AEW&C.[59]. The new components also reduced engine wear, lowering maintenance costs by about 5%. The variants built for the Boeing 737, the CFM56-3 and the CFM56-7, use a cascade type of thrust reverser. [1], The CFMI board of directors is currently split evenly between SNECMA and GE (five members each). The president tends to be drawn from SNECMA and sits at CFMI's headquarters near GE in Cincinnati, Ohio. The overall thrust was also reduced, from 24,000 to 20,000 lbf (107 to 89 kN), mostly due to the reduction in bypass ratio. The CFM56-5B/3 PIP (Performance Improvement Package) engine include these new technologies and hardware changes to lower fuel burn and lower maintenance cost. CFMI modified the engines by adding a sensor to force the combustor to continuously ignite under these conditions. It also powers the military versions of the Next-Generation 737, the C-40 Clipper, the P-8 Poseidon, and Boeing 737 AEW&C.[54]. Reproduction Date: The CFM International CFM56 (U.S. military designation F108) series is a family of high-bypass turbofan aircraft engines made by CFM International (CFMI), with a thrust range of 18,000 to 34,000 pounds-force (80 to 150 kilonewtons). With more than 30,000 engines delivered to date, it powers more than 550 operators worldwide. The CFM56-2-powered E-3 also became the standard configuration for aircraft purchased by the British and French. The basic mechanical arrangement is as the -3 series, but all aspects were aerodynamically improved from that model.

Prior to this accident, there were several other incidents of single or dual flameouts due to these weather conditions. The variants share a common design, but the details differ. Lewis, Flora (1975). [nb 1][42], GE and SNECMA also tested the effectiveness of chevrons on reducing jet noise.          Sexual Content Brausch, John F. et al (2002).

Both companies are responsible for producing components and each has its own final assembly line. "U.S. Ban Lifted on G. E. Plan". Following the French KC-135 order in 1978, the April 1979 decision by United Airlines to upgrade 30 of their DC-8-61 aircraft with the CFM56-2 was important for securing the development of the CFM56;[24] GE and SNECMA were two weeks away from freezing development had that order not materialized. [28] The turbine section was updated again in the "Evolution" upgrade. [26][27] However, when it became clear that Boeing and Airbus were not going to build all-new aircraft to replace the 737 and A320, CFMI decided to apply some of those Tech56 technologies to the CFM56 in the form of the "Tech Insertion" program which focused on three areas: fuel efficiency, maintenance costs and emissions.

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