PMA Parts vs OEM Parts: Aviation Buyers Guide

PMA (Parts Manufacturer Approval) parts are FAA-approved alternatives to OEM parts, built to the same airworthiness standard but produced by a different manufacturer—usually 20–40% cheaper and more available for older aircraft. OEM parts come from the original manufacturer and are typically required under active warranties or specific lease agreements. Both are safe and legal; the right choice depends on your aircraft’s warranty status, lease terms, and part availability.

When an aircraft is grounded and a critical component needs replacing, procurement teams often face a fast decision: order the Original Equipment Manufacturer (OEM) part, or go with a Parts Manufacturer Approval (PMA) alternative. Both are legal and widely used across commercial and military aviation, but each carries different trade-offs in cost, availability, and lessor acceptance. Understanding the difference before submitting an RFQ can save weeks of downtime and thousands of dollars.

What Are OEM Aircraft Parts?

OEM parts are manufactured by the original company that designed and built the aircraft or engine—companies like Boeing, Honeywell, Sikorsky, or Bombardier. They come with full manufacturer documentation and are typically the default choice for warranty-covered aircraft or newer fleets still under a type certificate holder’s direct support. You can browse the full list of aircraft parts manufacturers we work with.

Because OEM parts are produced under the original design authority, airlines, MROs, and lessors accept them without question. The trade-off is availability: for older or discontinued aircraft models, OEM parts can become scarce, expensive, or take months to source.

What Are PMA Aircraft Parts?

A PMA part has received Parts Manufacturer Approval from the Federal Aviation Administration, allowing a manufacturer other than the original OEM to legally produce and sell a replacement part. According to the FAA’s PMA regulations, approval is only granted after the manufacturer proves the part meets or exceeds the same design, material, and performance standards as the original.

PMA parts are common for consumables, hardware, and interior components, and increasingly for structural parts as more manufacturers pursue FAA approval. They exist to solve a problem OEM parts can’t always fix: keeping older aircraft airworthy once the original supply chain has dried up. Explore available aviation part types, including both OEM and PMA categories, to see what’s currently in stock.

Is a PMA Part as Safe as an OEM Part?

Yes. It must pass the same FAA airworthiness standards as the part it replaces, including engineering data review, testing, and ongoing quality audits. The difference lies in who manufactures the part, not in its safety or certification standard.

PMA vs OEM: Key Differences

When Should You Choose OEM Over PMA?

• The aircraft is under a lease agreement that specifically requires OEM components.
• The part is still under manufacturer warranty.
• Your MRO or insurer’s policy mandates OEM-only sourcing.

PMA makes more sense when the OEM part is obsolete, backordered, or no longer produced; when you need to cut maintenance costs without compromising airworthiness; or when the aircraft is older and past its warranty period.

A Real-World Example

Consider a regional carrier operating a 15-year-old fleet. When a hydraulic component fails and the OEM has a 12-week backorder, the operator has two choices: ground the aircraft and wait, or source an FAA-approved PMA equivalent that ships within days. In cases like this—increasingly common amid the industry-wide parts shortages reported through 2026—a verified PMA part with full documentation keeps the aircraft airworthy without waiting out an OEM backlog.

How to Verify a PMA Part Before Ordering

Confirm the supplier can provide the FAA PMA supplement number, an 8130-3 airworthiness tag, and full material traceability documentation. A trustworthy supplier provides this without hesitation—if a seller can’t produce paperwork, that’s a red flag regardless of price. This applies whether you’re ordering standard components or searching by NSN parts for military and defense applications.

Sourcing either part type comes down to working with a certified aviation parts supplier that maintains strict quality controls and full documentation on every item. ASAP Supply Chain sources both categories from verified manufacturers and PMA holders, with every part backed by AS9120B, ISO 9001:2015, and FAA AC 0056B certification and a no-China-sourcing policy many operators now require for compliance.

Conclusion

Both OEM and FAA-approved PMA parts offer safe, reliable solutions for aircraft maintenance. The right choice depends on your aircraft’s warranty, lease requirements, budget, and part availability. By sourcing from a trusted supplier with full certification and traceability, you can reduce downtime while maintaining compliance and airworthiness.

Frequently Asked Questions

Do Airlines Accept PMA Parts?

Most commercial airlines and MROs accept PMA parts, though some lessors restrict their use on leased aircraft through specific contract terms. Always check your lease or maintenance agreement first.

Are PMA Parts Cheaper Than OEM Parts?

Generally, yes—often 20–40% less expensive, since they don’t carry the original manufacturer’s brand premium. Exact savings vary by part type.

Can PMA Parts Be Used on Leased Aircraft?

It depends on the lease agreement. Some lessors permit PMA parts freely, while others require OEM-only replacement for return conditions.

How Do I Know if a Part Has Valid FAA PMA Approval?

Ask the supplier for the FAA PMA supplement number and matching documentation, and cross-check it against the FAA’s PMA database.

Is It Ever Required to Use OEM Parts Instead of PMA?

Yes—new aircraft still under manufacturer warranty, and some lease contracts, may require OEM parts specifically.

Need help sourcing certified PMA or OEM aircraft parts? Submit an RFQ to get a fast quote backed by full documentation and traceability.