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Retrieved 22 March Retrieved 9 November National Security Decision Memorandum There was little initial interest in the engine, but Boeing realized that the CFM56 might be a solution to upcoming noise regulations. High-bypass turbofan engines Turbofan engines — At the time it was not mandatory to flight test new variants of existing engines, and certification testing failed to reveal vibration modes that the fan experienced during the regularly performed power climbs at high altitude. Since the small initial launch order for twenty s split between two airlines, [3] over 5, Boeing aircraft had been delivered with CFM56 turbofans by April

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Launched inthe package included redesigned high-pressure compressor blades, an improved combustor, and improved high- and low-pressure turbine components [30] [31] which resulted in better fuel efficiency and lower nitrogen oxides NO x emissions.

President Richard Nixon in to approve the deal, and Henry Kissinger brought the issue up with President Pompidou in a meeting. GE was initially considering only contributing technology from its CF6 engine rather than its much more advanced F engine, developed for the B-1 Lancer supersonic bomber.

GE and Snecma also tested the effectiveness of chevrons on reducing jet noise. This page was last edited on 26 Marchat The CFM56 also supports pivoting-door type thrust reversers.

CFM International CFM56 (F108)

Retrieved 17 November The air passes through internal cgm56 in each blade and ejects at the leading and trailing edges. On April 17,Southwest Airlines Flight suffered from what appears to be a fan blade failure, debris from which punctured a window.


GE Aviation Press Release. The CFM first ran on 21 April The original CFM variant featured 44 tip- shrouded fan blades, [52] [nb 6] although the number of fan blades was reduced in later variants as wide-chord blade technology developed, down to 22 blades in the latest variant, the CFM It is most cfm566 used in military applications where it is known as the F; specifically in the KCthe E-6 Mercury and some E-3 Sentry aircraft.

Shrouds in the middle of blades are often used to damp vibrations. Navy’s E-6B Mercury airborne command post and communications relay aircraft and some non-U. Since the small initial launch order for twenty s split between two airlines, [3] over 5, Boeing aircraft had been delivered with CFM56 turbofans by April The Boeing landed safely, but one passenger was killed and several were injured.

CFM International CFM56 – Wikipedia

CFM boasts the highest production rate in the industry and has consistently built more than 1, CFM56 engines annually vfm56 A very recent investigation has led to the tentative conclusion that the problem originates in cdm56 Hydromechanical unit, and may involve an unacceptable level of fuel contamination with water, or particulate matter, including biodegradable material that create solids in the fuelor overuse of biocides to reduce bacterial growth.

Shrouds at the tips of fan blades are often used to minimize air leakage around the tips. Nixon administration officials feared that this project could be the beginning of the end of American aerospace leadership.

Retrieved 9 June This change was implemented to drive the larger fan on this variant. Retrieved 9 November The engines have also suffered, periodically, from thrust instability events tentatively traced to Honeywell’s hydromechanical unit.


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The Wall Street Journal. There have been several engine failures in the early service of the CFM56 family which were serious enough to either ground the fleet or require aspects of the engine to be redesigned.

It has more than operators and more than 2, CFMpowered jet aircraft are in the air at any moment. Among the changes from the CFMA is the option of a double-annular combustor that reduces emissions particularly NO xa new fan in a longer fan case, and a new low-pressure compressor with a fourth stage up from three in earlier variants.

Retrieved 11 December Retrieved 23 March A major reason for GE’s interest in the collaboration, rather than building a ton engine on their own, was that the Snecma project was the only source of development funds for an engine in this class at this particular time.

Very similar to the dry weight of an automobile. System types and platforms, currencies, world regions and more can all be input to collect the intelligence that you need, when you need it. These changes did not prevent the accident, and the investigation board found that the pilots did not follow the proper procedures for attempting to restart the engine, which contributed to the final result.