CFM International CFM56 (F108)

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About the F108/CFM56:

The CFM56 (military designation is F108) is a family of two-spool high-bypass turbofan engines used for both commercial and military applications. The CFM56 line of engines provides anywhere from 18,000 to 34,000 pounds of thrust. As of 2015, only the CFM56-5B (A320ceo) and CFM56-7B (737 NG) are still in production.

CFM International is a joint venture launched in 1974 between Safran Aircraft Engines (formerly known as Snecma) and General Electric (50% ownership each). In 2008, GE and Safran extended their partnership to the year 2040. The company CFM International and the product CFM56 were named by combining the commercial engine designations of the two parent companies - the General Electric CF6 and the Snecma M56. Snecma provides the low-pressure turbine, which drives the CFM56 fan in the front (the fan is also produced by Safran). General Electric provides the CFM56 engine core, which is based on GE's F101 turbofan engine used on the Boeing B-1B Lancer.

In 1979, the U.S. Air Force selected the CFM56-2B to replace the Pratt & Whitney TF33 (JT3D) engines used on the Boeing KC-135 Stratotanker. Also, the U.S. Air Force RC-135 Series of military special mission aircraft are powered by the CFM56-2B. The CFM engines provide reduced take-off roll, more power and increased fuel efficiency. The CFM56-2A powers the U.S. Navy's E-6B Mercury airborne command post and communications relay aircraft and some non-U.S. Air Force E-3 Sentry AWACS aircraft.

CFM56-7B engines (commercial use on the Boeing 737NG Series) power the U.S. Navy's Boeing C-40 Clipper as well as the 737 AEW&C and P-8 Poseidon Multi-Mission Maritime (MMA) aircraft. The P-8A Poseidon will be used for anti-submarine warfare (ASW) and anti-surface warfare (ASuW) and is intended to replace the aging P-3C Orion.

Non-military CFM56 engine variants power legacy Boeing 737-300/400/500 aircraft (CFM56-3), Boeing NG Series 737-600/-700/-800/-900 (CFM56-7B), Airbus A319/A320 (CFM56-5A), Airbus A318/A319/A320/A321 (CFM56-5B), and Airbus A340 (CFM56-5C). Another variant, the CFM56-2C, powered the Douglas DC-8-70.

As of October 2016, 29,500 CFM engines have been delivered. CFM delivered 1,638 CFM56 engines in 2015 and 1,560 in 2014. This compares to 1,450 CFM56 engines delivered in 2012 and 700 in 2002. CFM boasts the highest production rate in the industry and has consistently built more than 1,000 CFM56 engines annually since 2006.

LEAP is the replacement engine for the CFM56. The changeover to production of LEAP engines is currently in progress. The CFM56 has contributed significantly to the design of the LEAP engine by driving reliability and maintenance cost design practices. CFM expects to produce more than 2,000 LEAP engines annually by 2020. LEAP will power three new families of single-aisle commercial jets, the Airbus A320neo (LEAP-1A), Boeing 737 MAX (LEAP-1B), and the COMAC C919 (LEAP-1C).

Sources Used: U.S. Department of Defense (DoD), CFM International,
General Electric Co., and Safran.

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Engine Type:

Two-Spool High-Bypass Turbofan Engine


C-40 Clipper; Boeing 737 AEW&C;
P-8A Poseidon; KC-135/RC-135;
E-6B Mercury


In Production


General Electric Co. and Safran

Price/Unit Cost:

CFM56-2A2: $8.75 million (in 2015)

CFM International CFM56 (F108) Turbofan Engine

By Joakim Kasper Oestergaard Balle /// Contact Forecast International

External Resources:

Safran Aircraft Engines: CFM56
Official CFM56 Website: CFM56

YouTube: CFM56 | YouTube Videos

Fact Sheets: CFM56-5B / CFM56-7B


E-6B: CFM56-2A2 KC-135: CFM56-2B1


P-8A: CFM56-7B27


Engine Specifications: CFM International CFM56/F108

CFM International F108 CFM56-7B27

Manufacturer: General Electric Co.
Thrust: 27,300 pounds
Overall Pressure Ratio at Maximum Power: 32.7
Thrust-to-Weight Ratio: 5.19
Bypass Ratio: 5.1
Compressor: Two spool, axial flow, single-stage fan
LP-HP Compressor Stages: 3-9
HP-LP Turbine Stages: 1-4
Combustor Type: Annular
Length: 103.5 (2.63 m)
Diameter: 61 in (155 cm)
Dry Weight: 5,257 lbs (2,385 kg)
C-40 Clipper
Boeing 737 AEW&C
P-8A Poseidon
Price/Unit Cost: $13.73 million (in 2015)
First Run: Unknown
First Flight: Unknown

CFM International F108 CFM56-2A2 / 2B1

Manufacturer: General Electric Co.
Thrust: 2A2: 24,000 lbs; 2B1: 22,000 lbs
Overall Pressure Ratio at Maximum Power: 2A2: 31.8; 2A2: 30.5
Thrust-to-Weight Ratio: 2A2: 4.98; 2B1: 4.71
Bypass Ratio: 2A2: 5.9; 2B1: 6
Compressor: Two spool, axial flow, single-stage fan
LP-HP Compressor Stages: 3-9
HP-LP Turbine Stages: 1-4
Combustor Type: Annular
Length: 95.7 in (2.43 m)
Diameter: 68.3 in (173 cm)
Dry Weight: 2A2: 4,820 lbs (2,186 kg); 2B1: 4,671 lbs (2,119 kg)
2A2: E-6B Mercury
2B1: C-135/KC-135/RC-135
Price/Unit Cost: CFM56-2A2: $8.75 million (in 2015)
First Run: Unknown
First Flight: Unknown

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