CFM International Parts: 335-107-501-0 and a Guide to Aircraft Engine Component Procurement
CFM International parts are used across a broad range of aircraft propulsion programs, from commercial narrow-body aircraft to military platforms based on the CFM56 engine family. For aviation maintenance organizations, MRO providers, defense procurement teams, and aircraft parts buyers, identifying the correct part number and confirming its engine application are essential steps before placing an order.
One example is CFM International part number 335-107-501-0. The Integrated Aerospace listing identifies the component under CFM International and provides an RFQ pathway for procurement. Independent parts records identify 335-107-501-0 as a shim, while an inventory record associates the component with the CFM56-3 engine.
Understanding where a component fits within the larger CFM engine family can help procurement professionals distinguish between commercial CFM56 applications and military derivatives such as the F108.
What Is CFM International?
CFM International is a 50/50 joint company between GE Aerospace and Safran Aircraft Engines. The partnership develops, produces, and supports CFM engine programs, including the CFM56 and LEAP families.
The CFM56 family has powered numerous single-aisle aircraft and continues to support a large installed base. CFM International's current fleet information lists multiple CFM56 variants, including the CFM56-2B, CFM56-3, CFM56-5A, CFM56-5B, CFM56-5C, and CFM56-7B.
This broad range of engine variants is important when sourcing replacement components because a part number may be associated with a particular engine model, configuration, or installation position.
CFM International Part Number 335-107-501-0
The supplied Integrated Aerospace page identifies:
Manufacturer: CFM International
Part Number: 335-107-501-0
Part type: Shim, according to available independent parts records
Associated engine record: CFM56-3
Procurement category: Aircraft/engine component
The Integrated Aerospace page itself describes 335-107-501-0 as a CFM International component and provides reference data for the manufacturer and part number.
A separate parts listing identifies 335-107-501-0 as SHIM, while a historical inventory document lists the same number as SHIM (SPD) in a CFM56-3 inventory.
Because a shim is generally used to establish or maintain a required fit, spacing, alignment, or dimensional relationship between components, its exact installation function should be verified against the applicable Illustrated Parts Catalog (IPC), Component Maintenance Manual (CMM), or approved maintenance documentation before substitution or installation.
Why the Exact Part Number Matters
Aircraft engine components cannot safely be selected solely by appearance or a generic description. A part such as a shim may have specific dimensional, material, tolerance, configuration, or installation requirements.
When sourcing 335-107-501-0, procurement personnel should verify:
Exact manufacturer part number
Engine model and configuration
Applicable aircraft or end-item application
Quantity required
New, overhauled, or serviceable condition
Traceability and certification requirements
Applicable technical documentation
Any supersession or interchangeability information
CFM56-3 Applications
The CFM56-3 is a major member of the CFM56 family and was developed for the Boeing 737 Classic series.
CFM International states that the CFM56-3 powered the Boeing 737-300, 737-400, and 737-500. The company also notes that the CFM56-3 began the long-running CFM/Boeing relationship that continued through later 737 generations.
CFM International reported that the final CFM56-3 engine was shipped to Boeing in December 1999 for installation on the final Classic 737 production aircraft.
For procurement teams, this makes the CFM56-3 relevant to the aftermarket, maintenance, repair, and overhaul ecosystem supporting legacy 737 Classic aircraft and associated engine assets.
CFM56 Parts for Military Applications
It is important to distinguish the CFM56-3 from the military CFM56-2 variant.
The CFM56-2B is used in military applications and is designated F108 by the U.S. Air Force. U.S. Air Force documentation states that KC-135R aircraft were re-engine with CFM56 engines, while CFM International identifies the CFM56-2 as powering aircraft including the KC-135R, E-3 Sentry, and E-6B.
The U.S. Air Force describes the KC-135R as using CFM International CFM-56 turbofan engines, with a stated thrust rating of 21,634 pounds per engine.
The military F108 program demonstrates why identifying the precise engine model is critical. A component intended for a CFM56-3 installation should not automatically be assumed interchangeable with a component used on a CFM56-2/F108 engine.
Examples of Military CFM/F108 Parts
Publicly available NSN records provide examples of components associated with the F108-CF-100 engine. These records place the parts within FSC 2840, Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components.
Examples include:
Available records identify CAGE 58828 with CFM International for several of these components.
These examples are provided to illustrate the type of identification data procurement specialists may encounter. They should not be treated as interchangeable alternatives for 335-107-501-0.
Military Aircraft and the F108 Engine
The F108 is particularly significant in defense aviation because it is the military designation associated with the CFM56-2B.
CFM International reports that the CFM56-2 has military applications including the KC-135R, C-135FR, KE-3A, E-3A, RC-135, and E-6A/E-6B aircraft.
The U.S. Air Force has also documented the CFM Propulsion Upgrade Program, or C-PUP, which upgraded CFM56-2/F108 engines used by the KC-135R fleet and E-6B aircraft.
This creates an extensive aftermarket requirement for engine components, consumables, repairable assemblies, and other aircraft propulsion parts.
Are CFM International Parts Used in Military Generators?
The distinction between engine parts and generator parts is important in technical procurement.
Part number 335-107-501-0 should not be classified as a military generator component based on the available records. The available data identifies it as a shim associated with the CFM56-3 engine.
Similarly, the F108 examples above are aircraft gas-turbine engine components rather than generator components. Military aircraft may contain electrical power-generation systems, but those systems should be sourced using their own approved equipment nomenclature, part numbers, NSNs, and technical documentation.
Therefore, procurement teams searching specifically for military generator parts should avoid using CFM56/F108 engine part numbers as substitutes unless the applicable technical documentation explicitly establishes compatibility.
Key Procurement Considerations for CFM Parts
1. Confirm the Engine Model
Start with the exact engine model. CFM56-2, CFM56-3, CFM56-5B, and CFM56-7B are different configurations serving different aircraft applications. CFM International's current fleet data illustrates the breadth of the CFM56 family.
2. Verify the Part Number
A complete part number should be matched against approved technical documentation. Avoid relying solely on descriptions such as shim, seal, vane, or ring.
3. Check NSN Information Where Applicable
Military procurement may involve an NSN, NIIN, FSC, CAGE code, or other government identification data. For example, publicly available records associate several F108 components with FSC 2840 and provide NSNs for individual parts.
4. Review Condition and Traceability
For aircraft engine components, conditions can materially affect procurement decisions. Buyers should distinguish among new, new surplus, serviceable, repaired, overhauled, and other condition codes as applicable.
Documentation may include certificates of conformity, manufacturer documentation, inspection records, trace documentation, or other records required by the operator or maintenance organization.
5. Confirm Technical Documentation
CFM International provides technical manuals and documentation resources for CFM56 engines, including component maintenance and engine manual indexes.
Before installation, maintenance personnel should use the current approved technical data applicable to the specific engine configuration.
6. Consider Lead Time and Availability
Legacy engine programs can present different sourcing challenges from current-production engines. Availability may vary according to aircraft fleet size, MRO demand, inventory position, repair capability, and production status.
CFM's support organization includes parts distribution, maintenance support, technical assistance, and AOG support, demonstrating the importance of coordinated aftermarket logistics for CFM engine operators.
How to Prepare an RFQ for 335-107-501-0
A well-prepared RFQ helps suppliers identify the requested component accurately.
For 335-107-501-0, include:
Manufacturer: CFM International
Part number: 335-107-501-0
Description: Shim
Required quantity
Desired condition
Required delivery date
End application, when available
Applicable documentation or certification requirements
Shipping destination
Any inspection or traceability requirements
The Integrated Aerospace listing specifically provides an RFQ process for this part and allows procurement information such as quantity and required timing to be submitted.
Final Thoughts
CFM International parts support a diverse range of aircraft propulsion applications, making accurate part identification especially important for aviation and defense procurement.
335-107-501-0 is identified in available records as a shim associated with the CFM56-3, a turbofan engine used on Boeing 737 Classic aircraft. It should therefore be researched according to its specific CFM56-3 application rather than being assumed to be a military generator component.
For military procurement, the related CFM56-2B/F108 family is particularly significant because of its use on platforms such as the KC-135R and E-6B. Components in that supply chain can carry detailed NSN, CAGE, FSC, configuration, and technical-documentation requirements.
For any aircraft engine component, the safest procurement practice is to verify the exact part number, engine configuration, approved technical documentation, condition, traceability, and applicable NSN or government identification before purchase or installation
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