CFM56 

CFM56-2Turbofan Engine

22,000 - 24,000 POUNDS THRUST

 

The CFM56-2 engine is the "granddaddy" of the CFM family of engines. It was the first high-bypass engine in the 10-ton class and forms the foundation for the rest of the CFM engines in service today. Its sturdy, efficient architecture has allowed CFM to become the most popular engine in the air. It flew first on re-engined Boeing 707 aircraft in 1982 and was soon chosen to re-engine KC-135 tankers for the USAF.


QUICK FACTS

  • First high-bypass engine in the 10-ton class
  • Single-stage HP turbine
  • Low emission combustor
  • Low noise engine
  • First engine to meet FAR 33-6 ingestion requirement
  • Hydromechanical controls
  • 60 percent fewer parts than earlier high-bypass design

APPLICATIONS

Boeing DC-8 Super 70

KC-136

E-3 Sentry AWACS

 

 

THE TECHNOLOGY BEHIND THE CFM56-2 TURBOFAN ENGINE

Engine Model
2-C1 2A-2 | 2A-3 2-B1
Takeoff Conditions (sea level)
Max. takeoff (lb) 22,000 24,000 22,000
Airflow (lb/sec) 788 817 784
Bypass ratio 6.0 5.9 6.0
In-Flight Performance (installed) (35,000 ft-Mach=0.80-ISA)
Max climb thrust (lb) 5,400 5,760 5,450
Overall pressure ratio at max. climb 31.3 31.8 30.5
Max. cruise thrust (lb) 4,980 4,970  
Cruise SFC (Bucket)(lb/lb hr) 0.671 0.657 0.648
Engine Characteristics
Length (in) 95.7 95.7 95.7
Fan diameter (in) 68.3 68.3 68.3
Basic dry weight (lb) 4,635 4,820 4,671
Thrust reverser Yes Yes Yes
Electric power generation (kVA) 1 x 40 2 x 75/90 1 x 40
Oil tank capacity (hr) 25 72 25

 

DEVELOPMENT TIMELINE

Milestone Date Milestone Date
Initial development contract January 1972 Entry into service for military KC-135R/USAF July 1984
First engine to test (FETT) June 1974 E-3 (AWACS) entry into service* July 1986
First flight on B707 FTB Early 1979 KE-3 (tanker) entry into service* February 1987
CFM56-2 selected to re-engine USAF and FAF KC-135R January 1980 E-6 (USN) entry into service August 1989
Entry into service on the DC-8 Super 70 April 1982    

 

 *New A/C from B707 airframe

DID YOU KNOW?

The CFM56-2 is the first high-bypass 10-ton thrust engine of the CFM56 family.