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PMA Aircraft Parts vs OEM: What Buyers Should Actually Compare
PMA does not simply mean “cheaper,” and OEM does not automatically mean “better.” The real question is whether the part is approved, eligible for your application, correctly identified, and properly documented.
What Is a PMA Aircraft Part?
PMA stands for Parts Manufacturer Approval. The FAA describes PMA as a combined design and production approval used for replacement and modification articles intended for installation on type-certificated products. The FAA’s PMA process establishes that the approved article meets the applicable airworthiness requirements for its approved application.
That means a PMA part is not simply an aftermarket copy with a marketing claim. A valid PMA is an FAA approval basis for the particular article and application. The FAA maintains PMA information through its certification systems, including data that can be searched by PMA holder, article and applicable product information.
What PMA does—and does not—tell you
- It can establish an approved production/design basis for the PMA article.
- It does not eliminate the need to verify application eligibility.
- It does not automatically tell you the condition or remaining life of a particular serialized component.
- It does not replace receiving inspection, installation requirements, or applicable maintenance records.
PMA vs OEM: The Difference Buyers Actually Need to Understand
| Factor | OEM Part | PMA Part |
|---|---|---|
| Manufacturer | Original equipment manufacturer or its authorized production channel. | Approved PMA holder producing the approved replacement/modification article. |
| FAA approval basis | Depends on how the original article was approved and produced. | Produced under an FAA PMA for the approved article/application. |
| Application | Must still be the correct part for the aircraft/system. | Must match the PMA’s approved eligibility/application. |
| Documentation | May include manufacturer documentation and release/airworthiness paperwork as applicable. | May include PMA identification plus applicable release, traceability and condition documentation. |
| Price | Can carry OEM sourcing and support costs. | May provide a competitive alternative, but price alone should never establish suitability. |
The important distinction is that OEM and PMA describe different sourcing/approval relationships. Neither label by itself answers every question a maintenance organization must answer before installation.
Is a PMA Part as Good as an OEM Part?
There is no useful one-word answer. A PMA article must be evaluated against its approved application and the requirements that apply to the aircraft and installation. If a PMA part is approved and eligible for the intended application, the buyer should then evaluate the individual part’s identity, condition, records, life status and supporting documentation.
For sourcing purposes, a better question is:
How to Verify a PMA Part Before Buying
- Record the exact part number. Do not rely only on a product description or photograph.
- Identify the PMA holder and approval information. Verify the PMA information against FAA records where applicable.
- Check the approved application. Make sure the aircraft, engine, propeller or component application is actually covered.
- Confirm configuration. Check dash numbers, revisions, modifications, connector versions, voltage, dimensions and other configuration details where relevant.
- Check serial number and physical markings. The part received should match the paperwork.
- Review condition. New, overhauled, repaired, inspected, serviceable and used are not interchangeable descriptions.
- Review supporting records. Look for the documentation appropriate to the part, transaction and regulatory environment.
- For life-limited or time-controlled parts, verify status. Remaining life can matter more than the purchase price.
PMA Approval Is Not the Same as Installation Eligibility
This is one of the most important distinctions in aircraft parts purchasing. FAA guidance on aeronautical replacement parts addresses quality, eligibility, identification and traceability. Those concepts work together.
A part can have a legitimate approval basis and still require a separate check that it is eligible for the specific aircraft or higher-level assembly being maintained. Installation also has to comply with the applicable maintenance and airworthiness requirements.
PMA, TSO, and 8130-3 Are Not the Same Thing
| Term | What it primarily tells you | What you still need to verify |
|---|---|---|
| PMA | FAA approval for production/design of an approved replacement or modification article. | Specific application, part identity, condition and applicable records. |
| TSO/TSOA | Authorization associated with an article meeting a Technical Standard Order specification. | Whether the article is appropriate and approved for the intended installation. |
| FAA Form 8130-3 | Depending on its completion and authorized use, provides a specific airworthiness approval/release or related documentation function. | What the completed form actually represents, the item’s eligibility, and installation requirements. |
For a deeper explanation of Form 8130-3, see our FAA Form 8130-3 guide and our article on the 8130-3 dual release certificate.
Why Traceability Still Matters With PMA Parts
Approval status does not make the individual part’s paperwork irrelevant. FAA AC 20-62E provides guidance for determining the quality, eligibility and traceability of aeronautical parts and materials intended for installation on U.S. type-certificated products.
For buyers, this means the practical review should connect the part to its identity, source, condition and records. This becomes especially important when the component is serialized, repaired, overhauled, life-limited or subject to additional maintenance requirements.
See also:
- Aircraft Parts Traceability: What Buyers Should Verify
- Aircraft Parts Certification: Which Documents Matter?
- Aircraft Parts Receiving Inspection: What to Check
When a PMA Part May Make Sense
- You have verified the PMA article is eligible for the intended application.
- The exact part number/configuration matches the requirement.
- The supplier can provide appropriate documentation.
- The condition and life status are suitable.
- Your maintenance organization is comfortable with the approval basis and records.
Questions to Ask an Aircraft Parts Supplier
| Question | Why it matters |
|---|---|
| What is the exact part number? | Prevents substitutions based only on a similar description. |
| Is this OEM, PMA, repaired, overhauled, or another condition? | Clarifies the article’s sourcing and condition. |
| What approval or eligibility information supports this part? | Helps the buyer evaluate the intended application. |
| What records are supplied with the part? | Documents may be essential to receiving and installation decisions. |
| Does the serial number on the paperwork match the part? | Links the documentation to the physical article. |
| Are there life, overhaul, inspection, AD or modification considerations? | Identifies additional records that may be needed before installation. |
Common PMA Buying Mistakes
- Choosing on price alone. A lower price does not compensate for an eligibility or documentation problem.
- Assuming PMA means universal interchangeability. Approval is tied to an approved article/application.
- Ignoring configuration details. Similar-looking components can have materially different applications.
- Treating a certificate as proof of everything. Documentation has to be understood in context.
- Skipping receiving inspection. The physical part and paperwork should agree.
- Confusing OEM with automatically superior. The correct decision depends on the approved application and the specific part being purchased.
Buying Aircraft Parts With Documentation in Mind
For aircraft operators, owners and maintenance organizations, the safest purchasing workflow is to start with the required part number and application, then work backward through approval, identity, condition and documentation.
Jet Aviation Spare Parts provides aircraft parts and avionics sourcing options across categories including avionics, flight instruments, and altitude encoders. Always confirm the exact part and documentation requirements for your aircraft and maintenance environment before installation.
Need the Right Aircraft Part?
Start with the exact part number, aircraft/application and required documentation. That approach is more reliable than choosing between “OEM” and “PMA” based on the label alone.
Read the Buying Checklist Browse AvionicsFrequently Asked Questions
A PMA is an FAA approval for the design and production of an approved replacement or modification article. The specific PMA and application still need to be verified.
Not necessarily. “Aftermarket” is a broad commercial term. A PMA article has a specific FAA approval basis under the PMA system.
They can be, but price varies by component, supplier, availability and market conditions. Cost should not replace the eligibility and documentation review.
Do not assume that every PMA part must have an 8130-3 solely because it is PMA. The required documentation depends on the transaction, regulatory context, approval/release process and intended use.
No. The applicable approval and eligibility must cover the intended aircraft or product/application, and installation must meet the applicable requirements.
The FAA provides PMA and certification resources that can be used to verify approval information and applicable products.