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

B04Nacelles & thrust reversers

Enclose the engine and manage its external airflow.

Manufacturers & products

The nacelle combines inlet, cowls, acoustic treatment and reverser around a specific engine. Original production and aftermarket support are separate roles.

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.

integrator

Boeing — legacy Spirit operations

737 / CFM56-7 nacelle support

Legacy Spirit capability listings cover B737/CFM56-7 inlet cowls and thrust reversers. [1][2]

Program / application

B737 / CFM56-7 aftermarket capability [1][2]

Custom program inquiry

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

Product scope & qualifications
  • The cited capability list establishes support scope, not a new interchangeable nacelle offered to any aircraft.
View product & inquiry route
manufacturer

Collins Aerospace

Nacelle systems

Offers nacelle integration and components; its 737-800 platform sheet explicitly lists nacelle systems. [3][4]

Program / application

737-800 portfolio; exact subassembly effectivity required [3][4]

Custom program inquiry

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

Product scope & qualifications
  • Platform marketing does not identify every cowl or reverser part number.
View product & inquiry route
manufacturer

Safran Nacelles

A320neo / LEAP-1A nacelle

Designs and integrates the LEAP-1A nacelle for A320neo-family aircraft. [5]

Program / application

A320neo / LEAP-1A; not a 737 nacelle [5]

Custom program inquiry

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

Product scope & qualifications
  • LEAP-1A and LEAP-1B nacelles have different installations.
View product & inquiry route
manufacturer

ST Engineering / MRAS

Nacelle components and thrust reversers

Manufactures nacelle components for A320neo/LEAP-1A and other programs; separately lists CFM56-7 aftermarket services. [6]

Program / application

A320neo production; CFM56-7 aftermarket support [6]

Custom program inquiry

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

Product scope & qualifications
  • Do not infer 737 original-production work from the aftermarket list.
View product & inquiry route

What remains unverified

  • No public full 737NG nacelle mass or detailed geometry dataset was established.

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

  • Aircraft / engine combination

    Confirm exact engine, aircraft series and nacelle configuration before comparing suppliers.

  • Envelope and installation interfaces · m

    Diameter, length, pylon attachments and ground clearance must be considered together.

  • Aerodynamic and acoustic performance

    Use comparable installed drag, noise and operating conditions.

  • Mass and material breakdown · kg

    Separate inlet, fan cowls, reverser, exhaust and actuation mass.

  • Reverser architecture

    Compare actuation, locks, control interfaces and aircraft-specific deployment evidence.

  • Ice-protection interfaces

    Bleed-air or electrical demand affects aircraft utilities and installation.

  • Thermal and fire boundaries

    Assess material and zone interfaces with the engine installation.

  • Approved aftermarket support

    Ask whether capability covers new parts, repairs, exchanges or specific subassemblies.

Selection & integration notes
  • Boeing completed the acquisition of Boeing-related Spirit commercial and aftermarket operations in December 2025; the legacy name remains in support documents.
Supporting references [2]

Published product examples

2 REFERENCES

Specifications belong to the named product and configuration.

B737 / CFM56-7 inlet cowl and reverserBoeing — legacy Spirit operations

Public support listing identifies the assembly types; dimensions and mass require program documentation.

Example sources [1]
A320neo / LEAP-1A nacelleSafran Nacelles
Length
5.1 m[5]Safran nacelle product page.
Diameter
2.7 m[5]Safran nacelle product page.

Other-airframe geometry example; not dimensions of this 737-like blueprint.

Example sources [5]

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. Capabilities Spirit AeroSystems technical publications · Publication date not stated

    B737/CFM56-7 inlet cowl and thrust reverser aftermarket support.

    Accessed 2026-09-10
  2. Boeing completes acquisition of Spirit AeroSystems Boeing · Published 2025-12-08

    Boeing-related Spirit commercial and aftermarket operations integrated into Boeing.

    Accessed 2026-09-10
  3. Nacelle systems Collins Aerospace · Publication date not stated

    Nacelle component and integration capabilities.

    Accessed 2026-09-10
  4. Collins Aerospace on the Boeing 737-800 Collins Aerospace · Published 2023

    737-800 nacelle systems and wheels/brakes portfolio affiliation.

    Accessed 2026-09-10
  5. Nacelles de l’Airbus A320neo Safran · Publication date not stated

    LEAP-1A A320neo nacelle dimensions and integration scope.

    Accessed 2026-09-10
  6. Nacelles ST Engineering · Publication date not stated

    MRAS nacelle manufacturing programs and separate aftermarket coverage.

    Accessed 2026-09-10