How to Browse PMA Parts Listings for Your Boeing B737NG Maintenance Needs

The Boeing 737NG remains a staple in commercial aviation, with thousands still in service decades after its initial release. As these aircraft continue to age, many operators are turning to Parts Manufacturer Approval (PMA) components as a cost-effective way to maintain safety and performance across various critical systems. This blog will delve into how operators can effectively browse, evaluate, and source PMA parts listings tailored to 737NG maintenance needs, so read on to learn more.

What Are PMA Parts and How Are They Approved?

PMA parts are FAA-approved alternatives to original equipment manufacturer (OEM) components, meaning they are produced under rigorous quality control systems and backed by supporting technical data, testing, or comparative analysis. The FAA’s policy is to only grant production approval once it verifies that a PMA part meets or exceeds the performance and safety standards of the original design. As such, PMA parts can be used in place of OEM components, as long as the installation complies with all relevant regulatory documentation and guidelines.

How Has PMA Adoption Evolved in the Aviation Industry?

Although PMA parts were initially limited to general aviation purposes, their use in commercial fleets has steadily increased as regulatory frameworks and documentation requirements have evolved. In recent decades, the FAA has introduced structured approval processes and straightforward installation guidelines, making it easier for airlines to adopt PMA components with confidence. As a result, many carriers and MRO providers now include PMA parts in the formation of cost-effective maintenance strategies, particularly for aging platforms like the Boeing 737NG.

Which Aircraft Components Are Most Commonly Replaced with PMA Parts?

Several aircraft components are strong candidates for PMA substitution, such as:

• Cabin Interior Components: Many airlines replace seat components, placards, latches, and lighting fixtures with PMA parts that meet both functional and regulatory standards.
• Environmental System Parts: Components like ducting, insulation panels, and air filters can frequently be swapped with FAA-approved alternatives during routine inspections.
• Hardware and Consumables: Sourcing standardized items like fasteners, seals, and brackets from PMA manufacturers and suppliers can reduce recurring maintenance costs.
• Landing Gear Components: Commonly replaced parts like axle sleeves, bushings, and wear-resistant liners are often available from PMA vendors.
• Electrical System Parts: When electrical components like relays, breakers, or wire harness segments are shared across numerous aircraft platforms, there are often robust candidates for PMA substitution.

How Can You Safely Select a Reputable Distributor for PMA Parts?

Choosing the right supplier is critical for compliance and operational safety. When evaluating a distributor, it can be beneficial to consider the following:

• Certifications: Procuring products from a distributor that operates with AS9120B, ISO 9001:2015, and FAA AC 00-56B accreditation can ensure compliance with key industry standards.
• Customer Reviews: Feedback from past customers can offer valuable insight into a distributor’s consistency, service quality, and responsiveness.
• Traceability Documentation: Every shipment should include relevant documentation verifying the origin of purchased PMA parts.
• Technical Support: Distributors that provide engineering support, compatibility checks, or cross-reference tools can streamline selection.

What Do Many Operators Get Wrong About PMA Parts?

Some operators assume that PMA parts are challenging to document in maintenance records, even though they are required to comply with the same traceability standards as OEM components. Similarly, concerns about international acceptance are often mischaracterized, as many civil aviation authorities acknowledge FAA-approved PMA parts under existing bilateral agreements. Another widespread misconception is that these parts complicate routine maintenance, though the majority of airlines can incorporate them smoothly during planned service intervals.

What Does the Future Look Like for PMA Adoption in Commercial Fleets?

As commercial aircraft continue to age and cost pressures increase, PMA parts are expected to play a more prominent role in long-term maintenance planning. Emerging technologies such as digital tracking systems and advanced analytics may also facilitate further PMA adoption by improving part traceability and maintenance visibility. Overall, enhanced regulatory alignment between the FAA and international aviation authorities has the potential to increase global acceptance of these components.

Obtain Competitive Procurement Solutions on PMA Parts

Owned and operated by ASAP Semiconductor, Broadline Fasteners serves as a trusted, single-source platform for all the PMA components you need for the Boeing 737NG and other commercial aircraft. Every product we feature on our platform is sourced from reputable manufacturers and will come delivered with any applicable qualifying certifications or traceability documentation. Bearing this in mind, we invite you to kick off procurement today to see how we can help you secure everything you need from our extensive catalog with time and cost savings.