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
KC135
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.