CFM56-7B27/B3 - CFM International High Bypass Turbofan Engine

CFM56-7B27/B3 – CFM International High Bypass Turbofan Engine

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Overview

The CFM International CFM56-7B27/B3 is a flight-critical, high-bypass turbofan engine, representing one of the most advanced and powerful variants in the legendary CFM56-7B series. This is not just an engine; it is a complete, integrated propulsion system that powers the Boeing 737 Next Generation (NG) family of airliners. The CFM56-7B27/B3 is a dual-rotor, axial-flow turbofan, renowned for its exceptional reliability, fuel efficiency, and low cost of ownership, which has made it the best-selling engine in the history of commercial aviation. This specific model features a base thrust rating of 27,300 pounds-force, with the "/B3" designator indicating an optional "thrust bump" capability.

Engineered as a joint venture between GE Aviation and Safran Aircraft Engines, this powerplant is the heart of the world's most successful narrow-body airliner. Its integrity and performance are fundamental to the safety, efficiency, and operational capability of thousands of aircraft in daily service around the globe.

Key Features

• Advanced High-Bypass Architecture: Features a large, single-stage fan driven by a multi-stage low-pressure turbine, with a core driven by a separate high-pressure spool. This design produces a high bypass ratio, where the majority of the thrust is generated by the fan's bypass air, resulting in excellent fuel efficiency and a significantly lower noise signature.

• FADEC Controlled: The engine is managed by a Full Authority Digital Engine Control (FADEC) system. This sophisticated computer system optimizes engine performance in all phases of flight, monitoring and adjusting fuel flow, variable stator vane angles, and bleed air systems to maximize efficiency and protect the engine from exceeding its operational limits.

• /B3 Thrust Bump: The "/B3" variant includes a specific FADEC software and hardware package that allows for an increase in the maximum takeoff thrust rating when required by operational conditions, such as high-altitude airports or high ambient temperatures.

• Durability & Reliability: Engineered for the high-cycle demands of commercial airline operations. It features a rugged 3D-aerodynamic compressor design, a durable single-annular combustor for low emissions, and advanced superalloy materials in the turbine section for exceptional hot-section life.

• On-Wing Maintainability: Designed with a modular architecture that allows for the replacement of key sections (such as the fan, compressors, combustor, and turbines) without needing to remove the entire engine from the aircraft, significantly reducing maintenance downtime and cost.

Technical Specifications

• Engine Model: CFM56-7B27/B3

• Manufacturer: CFM International (A 50/50 joint company of GE Aviation and Safran Aircraft Engines)

  
  

  
  

• Engine Type: Two-Spool, High-Bypass Turbofan

• Maximum Takeoff Thrust: 27,300 lbf (121.4 kN)

• Bypass Ratio: 5.1:1

  
  

  
  

• Overall Pressure Ratio: 32.8:1

• Engine Architecture:

  • Fan: 1 Stage, with 24 wide-chord blades

  • Low-Pressure Compressor (LPC): 3 Stages (axial)

  • High-Pressure Compressor (HPC): 9 Stages (axial)

  • Combustor: Single-Annular

  • High-Pressure Turbine (HPT): 1 Stage

  • Low-Pressure Turbine (LPT): 4 Stages

• Dry Weight: 5,216 lbs (2,366 kg)

• Certification: FAA / EASA Type Certificate

Aircraft Compatibility

The CFM56-7B27/B3 is the specified OEM powerplant for the highest gross weight variants of the Boeing 737 Next Generation family.

• Primary Aircraft Models:

  • Boeing 737-800

  • Boeing 737-900 / 900ER

  • Boeing Business Jet 2 (BBJ2)

Why Choose a CFM56-7B27/B3?

The CFM56-7B series is the undisputed leader in its class, with a world-class dispatch reliability rate of 99.98%. This means an aircraft powered by this engine is delayed or cancelled for an engine-related issue only once every 5,000 departures. This unparalleled reliability, combined with excellent fuel efficiency and low maintenance costs, is why it was chosen by Boeing for the 737NG. Using a genuine OEM engine from the CFM supply chain is the only way to ensure the powerplant meets the stringent safety and performance standards required for a transport-category airliner.

The CFM56-7B27/B3 is a dual-rotor (or two-spool) turbofan. The N1 (low-pressure) spool consists of the large front fan, a 3-stage low-pressure compressor, and a 4-stage low-pressure turbine, all connected by a central shaft. The N2 (high-pressure) spool consists of the 9-stage high-pressure compressor and a single-stage high-pressure turbine, connected by a separate, concentric outer shaft that rotates at a much higher speed than the N1 spool. The Full Authority Digital Engine Control (FADEC) is the key to managing this complex system. It receives inputs from the flight deck (throttle position) and dozens of sensors on the engine (pressures, temperatures, speeds). It then computes the optimal fuel flow, variable stator vane angles for the HPC, and bleed valve positions to provide the commanded thrust in the most efficient and safe manner. This automated control prevents engine surges and stalls and protects the engine from exceeding its certified temperature and speed limits.

Note: This is a flight-critical, serialized, and life-limited aircraft engine. Installation, removal, and all maintenance actions must be performed by certified AME or A&P mechanics holding the appropriate ratings and in strict accordance with the current Boeing and CFM International maintenance manuals. All work must be properly documented in the aircraft's and engine's permanent records.