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AVIATION / Propulsion & fuel / REVIEWED 2026-09-11

B03Engine core

Compress air, release heat, and extract shaft power.

Manufacturers & products

Core modules come from an engine program’s partner network. Manufacturer capability is meaningful, but independent module substitution requires engine-specific design and approval.

Program applicability is stated for each listing. 737NG, 737 MAX, and other aircraft examples are distinct configurations; listed products are not automatically interchangeable or approved for installation.

manufacturer

GE Aerospace

CFM high-pressure core

CFM partner responsible for the high-pressure compressor, combustor and high-pressure turbine. [2]

Program / application

CFM engine program workshare [2]

Custom program inquiry

Suggested route: manufacturer program/product inquiry or approved aftermarket support; confirm exact aircraft and part-number effectivity.

Product scope & qualifications
  • Workshare is program-level evidence, not a list of every individual part manufacturer.
View product & inquiry route
manufacturer

Safran Aircraft Engines

CFM booster and low-pressure turbine

CFM partner responsible for the booster and low-pressure turbine modules. [2]

Program / application

CFM engine program workshare [2]

Custom program inquiry

Suggested route: manufacturer program/product inquiry or approved aftermarket support; confirm exact aircraft and part-number effectivity.

Product scope & qualifications
  • This is the low-pressure side of the engine partnership.
View product & inquiry route
manufacturer

MTU Aero Engines

GTF compressor and low-pressure turbine

Produces GTF compressor stages and the high-speed low-pressure turbine. [6]

Program / application

Pratt & Whitney GTF; not a 737 engine [6]

Custom program inquiry

Suggested route: manufacturer program/product inquiry or approved aftermarket support; confirm exact aircraft and part-number effectivity.

Product scope & qualifications
  • The quoted workshare concerns GTF engines, not CFM56 or LEAP.
View product & inquiry route
manufacturer

GKN Aerospace

Engine structures and rotating components

Manufactures compressor structures, rotors and turbine structures across civil engine programs. [4]

Program / application

Civil engine capability; exact 737 core part unverified [4]

Custom program inquiry

Suggested route: manufacturer program/product inquiry or approved aftermarket support; confirm exact aircraft and part-number effectivity.

Product scope & qualifications
  • A broad CFM56 relationship does not identify a particular -7B module or part number.
View product & inquiry route
manufacturer

Howmet Aerospace

Airfoils, disks, forgings and coatings

Engine supply-chain manufacturer of airfoils, rings, disks, forgings and hot-section coatings. [7]

Program / application

General component capability; 737 part applicability unverified [7]

Custom program inquiry

Suggested route: manufacturer program/product inquiry or approved aftermarket support; confirm exact aircraft and part-number effectivity.

Product scope & qualifications
  • Tier supplier capability; no exact 737 installation is established here.
View product & inquiry route
manufacturer

NGPF Manufacturing Company Singapore

GTF turbine disks

Singapore production venture manufacturing high-pressure turbine disks for GTF engines. [5]

Program / application

GTF manufacturing; not a 737 engine [5]

Published manufacturing site: Singapore

Custom program inquiry

Suggested route: manufacturer program/product inquiry or approved aftermarket support; confirm exact aircraft and part-number effectivity.

Product scope & qualifications
  • Disk part numbers and engine variants are not specified in the cited manufacturing overview.
View product & inquiry route

What remains unverified

  • Detailed compressor maps, cooling circuits and certified component lives are generally not published in these sources.

Where it comes from

A company address is shown separately from a published factory location. Request the manufacturing site and lot traceability for the exact part when sourcing.

What to compare

  • Module responsibility

    Identify whether the company owns the design, makes a forging, coats an airfoil or assembles the module.

  • Compressor stages and operating map

    Stage count alone does not establish pressure ratio, surge margin or efficiency.

  • Hot-section temperature capability · °C

    Compare the actual metal, cooling and coating system at the specified duty.

  • Thrust and exhaust-temperature margin

    Performance margins depend on the matched engine and deterioration state.

  • Materials and coating process

    Track substrate, casting or forging route and qualified repair coatings.

  • Rotor life and traceability · cycles

    Disks and other life-limited parts need configuration and accumulated-cycle records.

  • Cooling and bleed interfaces

    Module air requirements interact with engine performance and aircraft offtakes.

  • Approved repair and supply scope

    Separate new manufacture from repair services and ask for exact part-number capability.

Selection & integration notes
  • GE and Safran divide CFM module responsibilities; other suppliers below illustrate deeper production tiers or other engine programs.
Supporting references [2]

Published product examples

3 REFERENCES

Specifications belong to the named product and configuration.

CFM56-7 high-pressure compressorGE Aerospace
Compressor stages
9[1]2004 manufacturer technology overview.

Historical NG engine architecture reference.

Example sources [1][2]
CFM56-5B / -7B improved HPT bladeGE Aerospace

CFM describes a 2023 blade improvement; dimensions and rating-specific life data were not published.

Example sources [3]
MTU GTF high-pressure compressor workshareMTU Aero Engines
MTU compressor scope
First 4 stages[6]High-pressure compressor in the published GTF workshare.

A manufacturing-scope example, not an independent replacement compressor.

Example sources [6]

Sources & references

REVIEWED 2026-09-11

Manufacturer pages and technical documents support the linked claims. A review date is not a publication date or stock check.

  1. CFM56-7 technology overview CFM International · Published 2004-07-18

    Historical CFM56-7 thrust range, fan geometry and compressor stages.

    Accessed 2026-09-10
  2. GE Aerospace and Safran celebrate 50th anniversary GE Aerospace · Publication date not stated

    CFM partner division of engine module work.

    Accessed 2026-09-10
  3. CFM56 services and support CFM International · Publication date not stated

    CFM56 high-pressure turbine blade improvement and support network.

    Accessed 2026-09-10
  4. Civil engines GKN Aerospace · Publication date not stated

    Engine structural and rotating component capabilities and named program examples.

    Accessed 2026-09-10
  5. RTX in Singapore RTX · Publication date not stated

    NGPF Manufacturing Company GTF fan blade and turbine disk manufacturing in Singapore.

    Accessed 2026-09-10
  6. GTF engine family MTU Aero Engines · Publication date not stated

    MTU GTF compressor and low-pressure turbine workshare.

    Accessed 2026-09-10
  7. Howmet Engine Products Howmet Aerospace · Publication date not stated

    Airfoils, hot-section coatings, structures, rings, disks and forgings.

    Accessed 2026-09-10