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.

Preserving the integrity and performance of flight control systems is a critical practice for aircraft operations. Among the many components that contribute to upholding optimal flight characteristics, trim tabs and flap actuators have a significant impact on handling and stability, making their maintenance essential. In this blog, we will delve into common issues that may arise with these components and some routine maintenance practices that should be followed, so read on to explore how the meticulous upkeep of trim tabs and flap actuators supports safe and efficient flight.