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Encyclopedia > General Electric CF6
CF6 turbofan at the KLM engine shop
CF6 turbofan at the KLM engine shop

The General Electric TF39 and CF6 family of high-bypass turbofan engines are the most popular large aircraft turbines in the world, powering civil and military widebodies from a variety of manufacturers. They also form the basis for the LM2500, LM5000 and LM6000 marine turboshafts. The family is produced by GE-Aviation, formerly General Electric Aircraft Engines. Image File history File links Turbofan640. ... Image File history File links Turbofan640. ... A high-bypass turbofan engine is a turbofan with a bypass ratio of at least 5. ... The General Electric LM2500 industrial and marine turboshaft gas turbine is a derivative of GE Aircraft Engines CF6-6 aircraft engine. ... LM6000 GTG in an electrical power plant application. ... Schematic diagram showing the operation of a simplified turboshaft engine. ... GE-Aviation, a subsidiary of General Electric, is headquartered in Evendale, Ohio (a Cincinnati suburb). ... GE-Aviation, a subsidiary of General Electric, is headquartered in Evendale, Ohio (a Cincinnati suburb). ...


General Electric intends to replace the CF6 family with the GEnx, which will have an entry into service date of 2008. Boeing 787 The General Electric GEnx (General Electric Next-generation) is an advanced turbofan under development by GE Aircraft Engines (GEAE) for the Boeing 787. ...

Contents

Variants

TF39

The TF39 is a revolutionary 1960s engine rated from 41,000 to 43,000lbf (191 to 205 kN) of thrust. It is the world's first high-bypass turbofan engine and the parent of the successful CF6 series. It employed a great deal of then-new technological features such as: The 1960s decade refers to the years from January 1, 1960 to December 31, 1969, inclusive. ... The pound-force is a non-SI unit of force or weight (properly abbreviated lbf or lbf). The pound-force is equal to a mass of one pound multiplied by the standard acceleration due to gravity on Earth (which is defined as exactly 9. ...

  • 1½ stage fan blades (unique to TF39).
  • 8:1 bypass ratio.
  • Variable stator vanes.
  • Turbines equipped with advanced cooling.
  • Fuel efficiency better than any engines available at the time.
  • Cascade-type thrust reversers.

Since its introduction on the Lockheed C-5 Galaxy military transport, the TF39 has benefited directly from CF6 design technology: components, materials, processes, manufacturing techniques, and repair processes. KLM Fokker 70 with reverse thrust applied. ... The Lockheed SR-71, remarkably advanced for its time and unsurpassed in many areas of performance The Lockheed U-2 first flew in 1955 providing much needed intelligence on Soviet bloc countries Lockheed Corporation was an aerospace company founded in 1912 which merged with Martin Marietta in 1995 to form... The C-5 Galaxy is a jet-powered military transport aircraft designed to provide strategic heavy airlift over intercontinental distances. ...


Mechanically, the TF39 is rather unusual for a high bypass ratio turbofan; the single stage snubbered fan rotor has a set of inlet guide vanes for the outer bypass section and the core booster stage is located in front of the fan rotor, rather than behind. The following sectional view shows the fan arrangement (http://www.aircraftenginedesign.com/pictures/TF39.gif). Note the very long gas generator used in this pioneering design.


CF6-6

The CF6-6 was a development of the military TF39. It was first utilized on the McDonnell Douglas DC-10-10. DC-10, retired from American Airlines fleet at gate McDonnell Douglas was a major American aerospace manufacturer, producing a number of famous commercial and military aircraft. ... The McDonnell Douglas DC-10 is a three-engined medium to long-range widebody airliner, with two engines mounted on underwing pylons and a third engine at the base of the vertical stabilizer. ...


This initial version of the CF6 comprises a single stage fan, with one core booster stage, driven by a 5-stage LP turbine, supercharging a 16-stage HP compressor driven by a 2-stage HP turbine; the combustor is annular and exhaust separate jets. The 2194,5 mm/86.4in diameter fan generates an airflow 591kg/s / 1303lb/s, resulting in a relatively high bypass ratio of 5.72. The overall pressure ratio of the compression system is 24.3. At Maximum Take-off, the engine develops a static thrust of 177,9kN / 40000lbf.


The failure of a CF6-6 resulted in the crash of United Airlines Flight 232 United Airlines flight 232 was a scheduled flight operated by United Airlines between Denver and Philadelphia via Chicago. ...


CF6-50

The CF6-50 series are high-bypass turbofan engines rated between 46,000 to 54,000 lbf (205 to 240 kN) of thrust. The CF6-50 was developed into the LM2500 industrial and marine turboshaft engines. It was launched in 1969 to power the long range McDonnell Douglas DC-10-30, and was derived from the earlier CF6-6. Schematic diagram showing the operation of a simplified turboshaft engine. ... The McDonnell Douglas DC-10 is a three-engined medium to long-range widebody airliner, with two engines mounted on underwing pylons and a third engine at the base of the vertical stabilizer. ...


Presumably, because a significant increase in thrust, and therefore core power, was required, not long after the -6 had entered service, General Electric could not increase (HP) turbine rotor inlet temperature significantly, so they took the very expensive decision to reconfigure the CF6 core to increase its basic size. They achieved this by removing 2 stages from the rear of the HP compressor (even leaving an empty air passage, where the blades and vanes had once been located). 2 extra booster stages were added to the IP compressor, which increased the overall pressure ratio to 29.3. Although the 2194,5mm. / 86.4in diameter fan was retained, the airflow was raised to 658 kg/s / 1450lb/s, yielding a static thrust of 227kN / 51000lbf. The increase in core size and overall pressure ratio, significantly raised the core flow, resulting in a decrease in bypass ratio to 4.26.


In late 1969, the CF6-50 was selected to power the then new Airbus A300. Air France became the launch customer for the A300 by ordering six aircraft in 1971. In 1975, KLM was the first airline to order the Boeing 747 powered by the CF6-50. This led further developments to the CF6 family such as the CF6-80. 1969 (MCMLXIX) was a common year starting on Wednesday (the link is to a full 1969 calendar). ... Airbus S.A.S. is a leading aircraft manufacturer based in Toulouse, France. ... This article is about the airliner. ... Air France (Compagnie Nationale Air France) is a subsidiary of Air France-KLM. Before its merger with KLM, it was the national airline of France, employing 71,654 people (as of January 2005). ... 1971 (MCMLXXI) was a common year starting on Friday (the link is to a full 1971 calendar). ... 1975 (MCMLXXV) was a common year starting on Wednesday. ... KLM (in full: Koninklijke Luchtvaart Maatschappij, literally Royal Aviation Company; usual English: Royal Dutch Airlines) is a subsidiary of Air France-KLM. Before its merger with Air France, KLM was the national airline of the Netherlands. ... Boeing Commercial Airplanes (BCA), based in Renton Washington, is a unit of The Boeing Company, consisting of the Seattle-based former Boeing Airplane Company (the civil airliner division), as well as the Long Beach-based Douglas Aircraft division of the former McDonnell Douglas Corporation. ... The Boeing 747, commonly called a Jumbo Jet, is among the most recognizable jet airliners and is the largest passenger airliner in service. ...


CF6-80

The CF6-80 series are high-bypass turbofan engines with a thrust range of 48,000 to 75,000 lbf (214 to 334 kN). It is an advanced development of the earlier successful CF6-50 series engine, but despite superficial resemblance, it is a completely new engine with no interchangeable parts. Although the HP compressor still has 14 stages, GE did take the opportunity to tidy-up the design, by removing the empty air passage at compressor exit.


Following a series of high-pressure turbine failures, one of which resulted in a 767 being written off, the FAA has issued an airworthiness directive mandating inspections for over 600 engines. The NTSB feels this number should be increased to include all -80 series engines with more than 3000 cycles since new or since last inspection. [1]


The -80 series is divided into three distinct models.


CF6-80A

The CF6-80A, which has a thrust rating of 48,000 to 50,000 lbf (214 to 222 kN), powered two twinjets, the Boeing 767 and Airbus A310. The GE-powered 767 entered airline service in 1982, and the GE powered A310 in early 1983. It is rated for ETOPS operations. The Boeing 767 is a commercial passenger aircraft manufactured by Boeings Commercial Airplane division. ... The Airbus A310 is a medium- to long-range widebody airliner developed from the Airbus A300 and manufactured by Airbus SAS. Perhaps the greatest attribute of the A310 is that of range. ... 1982 (MCMLXXXII) was a common year starting on Friday of the Gregorian calendar. ... ETOPS (Extended-range Twin-engine Operational Performance Standards) is an acronym for an International Civil Aviation Organization (ICAO) rule permitting twin-engined commercial air transports to fly routes that, at some points, are further than a distance of 60 minutes flying time from an emergency or diversion airport. ...


For the CF6-80A/A1, the fan diameter remains at 2194,5mm / 86.4in, with an airflow of 651 kg/s / 1435lb/s. Overall pressure ratio is 28.0, with a bypass ratio of 4.66. Static thrust is 214kN / 48000lbf. The basic mechanical configuration is the same as the -50 series


CF6-80C2

The CF6-80C2, which entered revenue service in October 1985, has a thrust rating of 52,500 to 63,500 lbf (234 to 282 kN). It has a reputation of good fuel economy in its thrust class. The CF6-80C2 is certified with 16 different thrust ratings. This versatile engine has the most widespread use of any large turbofan engine.


For the CF6-80C2-A1, the fan diameter is increased to 93in, with an airflow of 1754lb/s. Overall pressure ratio is 30.4, with a bypass ratio of 5.15. Static thrust is 59000lbf. A 4th stage is added to the IP compressor and a 5th to the LP turbine.


The CF6-80C2 is currently certified on eleven wide-body aircraft models including the Boeing 747 and McDonnell Douglas MD-11. The CF6-80C2 is also certified for ETOPS-180 for the A300, A310, and Boeing 767 aircraft. Wide-body Virgin Atlantic Airbus A340-300 A wide-body aircraft is a large airliner with a fuselage diameter of about 5 to 6 metres and twin aisles. ... The McDonnell Douglas MD-11 is a three-engined medium to long-range widebody airliner, with two engines mounted on underwing pylons and a third engine at the base of the vertical stabilizer. ... This article is about the airliner. ...


CF6-80E1

The CF6-80E1 is specifically designed for the Airbus A330, with thrust rating of 300 to 334 kN / 67,500 to 75,000 lbf. For the CF6-80E1A2, the fan diameter is increased to 2438 mm / 96in, with an airflow of 873,6 kg/s / 1926lb/s. Overall pressure ratio is 32.6, with a bypass ratio of 5.3. The Airbus A330 is a large-capacity, wide-body, medium-to-long-range commercial passenger airliner manufactured by EADS (Airbus S.A.S.). It was developed at the same time as the four-engined A340. ...


Other variants

The industrial and marine development of the CF6-80, the LM6000 Series, has found wide use including fast ferry and high speed cargo ship applications. LM6000 GTG in an electrical power plant application. ...


CF6-32

The CF6-32 was intended to be a stripped-down version of the CF6-80 for the Boeing 757. It was never launched due to lack of interest from airlines. American Airlines Boeing 757 The Boeing 757 is a medium-range transcontinental commercial passenger airplane manufactured by Boeing Commercial Airplanes. ...


Applications

The Lockheed SR-71, remarkably advanced for its time and unsurpassed in many areas of performance The Lockheed U-2 first flew in 1955 providing much needed intelligence on Soviet bloc countries Lockheed Corporation was an aerospace company founded in 1912 which merged with Martin Marietta in 1995 to form... The C-5 Galaxy is a jet-powered military transport aircraft designed to provide strategic heavy airlift over intercontinental distances. ... DC-10, retired from American Airlines fleet at gate McDonnell Douglas was a major American aerospace manufacturer, producing a number of famous commercial and military aircraft. ... The McDonnell Douglas DC-10 is a three-engined medium to long-range widebody airliner, with two engines mounted on underwing pylons and a third engine at the base of the vertical stabilizer. ... The McDonnell Douglas DC-10 is a three-engined medium to long-range widebody airliner, with two engines mounted on underwing pylons and a third engine at the base of the vertical stabilizer. ... Boeing Commercial Airplanes (BCA), based in Renton Washington, is a unit of The Boeing Company, consisting of the Seattle-based former Boeing Airplane Company (the civil airliner division), as well as the Long Beach-based Douglas Aircraft division of the former McDonnell Douglas Corporation. ... The Boeing 747, commonly called a Jumbo Jet, is among the most recognizable jet airliners and is the largest passenger airliner in service. ... Airbus S.A.S. is a leading aircraft manufacturer based in Toulouse, France. ... This article is about the airliner. ... The KC-10 Extender is a tanker aircraft in service with the US Air Force. ... The E-4B Nightwatch, formerly known as NEACP (Kneecap) and sometimes called NAOC (National Airborne Operations Center), is a Boeing 747-200 aircraft specially built to serve as a survivable mobile command post for the President during a nuclear war. ... Boeing Commercial Airplanes (BCA), based in Renton Washington, is a unit of The Boeing Company, consisting of the Seattle-based former Boeing Airplane Company (the civil airliner division), as well as the Long Beach-based Douglas Aircraft division of the former McDonnell Douglas Corporation. ... The Boeing 747, commonly called a Jumbo Jet, is among the most recognizable jet airliners and is the largest passenger airliner in service. ... Air Force One is the air traffic control call sign of any U.S. Air Force aircraft carrying the President of the United States. ... The Boeing 767 is a commercial passenger aircraft manufactured by Boeings Commercial Airplane division. ... E-10 MC2A Shown in E-10A Configuration The Northrop Grumman E-10 MC2A is a military aircraft currently under development as replacement for the Boeing 707 based E-3 Sentry, E-8 Joint STARS, and RC-135 Rivet Joint aircraft in US service. ... The Boeing 767 is a commercial passenger aircraft manufactured by Boeings Commercial Airplane division. ... The Boeing 767 is a commercial passenger aircraft manufactured by Boeings Commercial Airplane division. ... The C-5 Galaxy is a jet-powered military transport aircraft designed to provide strategic heavy airlift over intercontinental distances. ... The McDonnell Douglas MD-11 is a three-engined medium to long-range widebody airliner, with two engines mounted on underwing pylons and a third engine at the base of the vertical stabilizer. ... The McDonnell Douglas MD-12 was a design study undertaken by the McDonnell Douglas company in the 1990s. ... The Airbus A310 is a medium- to long-range widebody airliner developed from the Airbus A300 and manufactured by Airbus SAS. Perhaps the greatest attribute of the A310 is that of range. ... The Airbus A330 is a large-capacity, wide-body, medium-to-long-range commercial passenger airliner manufactured by EADS (Airbus S.A.S.). It was developed at the same time as the four-engined A340. ...

References

  1. ^ NTSB wants at-risk GE CF6 engines removed Flight International

  Results from FactBites:
 
General Electric CF6 - Wikipedia, the free encyclopedia (554 words)
The General Electric TF39 and CF6 family of high-bypass turbofan engines are the most popular large aircraft turbines in the world, powering civil and military widebodies from a variety of manufacturers.
The family is produced by GE-Aviation, formerly General Electric Aircraft Engines.
General Electric inteds to replace the CF6 family with the GEnx, which will have an entry into service date of 2008.
General Electric CF6 (77 words)
The CF6 high-bypass turbofan was based on the TF39 and was designed to power the McDonnell Douglas DC-10 and Lockheed L-1011.
The DC-10 was launched with the CF6; however, the Lockheed went with the Rolls-Royce RB.211.
The CF6 is known as the F103 by the U.S. military.
  More results at FactBites »

 
 

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