PMA Parts: Definition, Acceptance, and Regulatory Requirements

PMA (Parts Manufacturer Approval) is an FAA authorization that allows a manufacturer to produce and sell aircraft parts for installation on type-certificated products without requiring further approval from the original equipment manufacturer (OEM). These parts are designed, tested, and produced to meet or exceed the airworthiness standards established by the FAA, ensuring they are safe and reliable for use in aviation.

What Does PMA Stand For?

PMA stands for Parts Manufacturer Approval. It is a formal approval issued by the Federal Aviation Administration (FAA) under 14 CFR Part 21, Subpart K, permitting a manufacturer to produce replacement or modification parts for installation on type-certificated aircraft, engines, propellers, or appliances.

PMA Parts in Aerospace and Aviation

In aerospace and aviation, PMA parts are non-OEM components that serve as alternatives to parts produced by the original manufacturer. They are commonly used in maintenance, repair, and overhaul (MRO) operations, offering cost-effective solutions while maintaining compliance with regulatory standards. PMA parts can range from simple components like bolts and brackets to complex systems such as avionics or interior furnishings.

FAA PMA Parts: Regulatory Framework

The FAA grants PMA based on one of two design approval paths:

• Identicality: The part is identical in design and composition to an OEM part already approved under a type certificate. This path may be pursued with or without licensing from the OEM.
• Test and Computation: The part is shown through testing and analysis to meet applicable airworthiness standards.

A Supplemental Type Certificate (STC) is a separate approval that can provide the design approval data supporting a PMA application, but it is not itself an independent PMA path. PMA holders must maintain a production quality system compliant with FAA requirements and are subject to ongoing oversight, including audits and inspections.

EASA Acceptance of FAA PMA Parts

The European Union Aviation Safety Agency (EASA) does not automatically accept FAA PMA parts for installation on EASA-registered aircraft. Acceptance is governed by the FAA-EASA Bilateral Aviation Safety Agreement (BASA) and its Technical Implementation Procedures (TIP). Under these agreements, non-critical FAA PMA parts may be accepted when accompanied by an FAA Form 8130-3 export certificate containing the required statement. Critical PMA parts and those not produced under license from the OEM typically require additional EASA acceptance, which may involve engineering evaluation or other approval mechanisms. EASA Form 1 is a release certificate for an approved part, not a validation mechanism for PMA acceptance.

Operators and maintenance organizations must verify acceptance on a case-by-case basis, ensuring compliance with EASA airworthiness directives and Part 21 requirements.

Global Regulatory Acceptance of PMA Parts

Beyond the FAA and EASA, other aviation authorities maintain their own approval frameworks for aircraft parts. These include the UK CAA, Canada TCCA, Brazil ANAC, China CAAC, and Gulf authorities such as GCAA UAE, GACA Saudi, and QCAA Qatar. Buyers must verify part acceptance according to the registration state of the aircraft and the specific requirements of the governing authority. While many jurisdictions align with ICAO Annex 8 airworthiness standards, regional implementations vary.

Why Aircraft Parts Have Strict Certification Requirements

Aircraft parts are subject to rigorous certification standards due to the critical role they play in flight safety. The failure of a single component can have catastrophic consequences, necessitating stringent design, manufacturing, and quality control processes. Regulatory bodies like the FAA and EASA establish these requirements to ensure that all parts—whether OEM or PMA—meet consistent standards for performance, durability, and reliability. Certification processes include:

• Design approval through testing and analysis.
• Quality system audits during production.
• Traceability and documentation throughout the part’s lifecycle.

Limitations on COTS Parts in Aviation Designs

Commercial Off-The-Shelf (COTS) parts—components designed for general use rather than specific aviation applications—are often limited in aircraft designs due to concerns over reliability, traceability, and environmental suitability. Key reasons include:

• Lack of Certification: COTS parts are not typically produced to aviation airworthiness standards, making them unsuitable for safety-critical applications without extensive validation.
• Environmental Factors: Aviation environments involve extreme conditions—such as temperature variations, vibration, and pressure changes—that many COTS parts are not designed to withstand.
• Traceability and Quality Control: Aviation requires full traceability of materials, manufacturing processes, and compliance history, which COTS suppliers often cannot provide.
• Regulatory Compliance: Using COTS parts may require additional approval steps, such as PMA or STC processes, to ensure they meet regulatory standards.

Manufacturers limit COTS usage to minimize risk and ensure that all components integrate seamlessly into the aircraft’s systems without compromising safety or performance.

Key Takeaways

• PMA (Parts Manufacturer Approval) allows non-OEM manufacturers to produce FAA-approved parts for use in aviation, providing cost-effective alternatives without sacrificing safety.
• EASA acceptance of FAA PMA parts is governed by bilateral agreements, with specific requirements depending on part criticality and licensing status.
• Multiple global authorities—including FAA, EASA, UK CAA, TCCA, ANAC, CAAC, and Gulf regulators—have distinct part acceptance procedures that must be verified per aircraft registration state.
• Strict certification requirements for aircraft parts ensure reliability and safety, with rigorous testing, quality control, and regulatory oversight.
• COTS parts are limited in aviation designs due to insufficient certification, environmental suitability, and traceability concerns.
• Understanding PMA and regulatory frameworks is essential for procurement and maintenance professionals to ensure compliance and airworthiness.