CFM56-2 General
Engine Type
CFM56-2
Type
Turbofan Engine
Thrust Rating (lbf)
22,000 - 24,000
Manufacturer
CFM
CFM56-2 Program Milestones
Initial Development Contract
January 1972
First Engine To Test (FETT)
June 1974
Flight Test on 707
Early 1979
CFM56-2 Selection KC-135R
January 1980
Entry into commercial service
April 1982
E-3 entry into service
July 1986
KE-4 entry into service
February 1987
E-6 entry into service
August 1989


CFM56-2 Dimensions
Length
95.7 inch
Fan Diameter
68.3 inch
Basic Dry Weight (-2-C1)(lb)
4,635
Basic Dry Weight (-2A-2)(lb)
4,820
Basic Dry Weight (-2-B1)(lb)
4,671




CFM56-2

The CFM56-2 turbofan engine was the beginning of a success story when it entered service back in 1982. The engine was certified at 24,000 pounds thrust by the FAA and DGAC, and was the first high-bypass 10-ton thrust engine of the CFM56 family. The -2 was originally developed from the advanced GE military F101 and features high performance together with large fuel consumption savings and met noise and emission requirements for new aircraft in force at the time of its introduction. Furthermore, the CFM56-2 was the first high-bypass ratio engine to meet the FAR 33-6 ingestion rules.

Due to its outstanding performance and reliability during the re-engined Boeing 707 flight test program, the CFM56-2 was selected in 1979 to re-engine the McDonnell Douglas commercial DC-8 aircraft for VIP and transport applications. Proven low fuel burn enabling extended range and excellent take-off performance from hot airfields, resulted into the selection of the engine by many major military forces such as the USAF, USN, FAF, and RAF to power their re-engined or new KC-135R, C-135FR, E-3, KE-3 and E-6 tactical and strategic aircraft.

The CFM-56-2 maintainability, built-in by modular design and advanced condition monitoring, along with its low shop visit and engine shutdown rates, are the foundations of CFM56 high reliability leading to the customer's confidence in the CFM56 family.


Boeing E-3A Sentry
NATO Boeing E-3A Sentry
USAF Boeing 707
Examples of aircraft that are powered by the CFM56-2

CFM56-2 Performance

Take-off Conditions (Sea Level)
CFM56
-2-C1
-2A-2 -2A-3 -2-B1
Max Take-off (lb)
22,000
24,000
24,000
22,000
Airflow (lb/sec)
788
817
817
784
Bypass Ratio
6.0
5.9
5.9
6.0

In-Flight Performance (35,000 ft-Mach=0.80-ISA)
CFM56
-2-C1
-2A-2 -2A-3 -2-B1
Max Climb Thrust (lb)
5,400
5,760
5,760
5,450
Overall pressure ratio
31.3
31.8
31.8
30.5
Max Cruise Thrust
4,980
4,970
4,970
Cruise SFC (Bucket)(lb/lb hr)
0.671
0.657
0.657
0.648