Understanding Your Part Options in General Aviation
When it comes to maintaining General Aviation aircraft, operators and MROs face a critical decision at every service interval: which type of replacement part to install. The three primary categories—OEM, PMA, and USM—each carry distinct advantages, cost profiles, and documentation requirements. Understanding these differences helps operators make informed decisions that balance safety, budget, and regulatory compliance.
OEM Parts (Original Equipment Manufacturer)
OEM parts are manufactured by or for the original aircraft or component manufacturer. They carry the manufacturer’s full approval and documentation, and are generally considered the gold standard for replacement components. OEM parts typically come at the highest price point but offer guaranteed compatibility and full factory support.
PMA Parts (Parts Manufacturer Approval)
PMA parts are FAA-approved alternatives manufactured by third-party companies. These parts undergo rigorous testing and certification to meet or exceed OEM specifications. PMA components often provide significant cost savings—sometimes 30–50% below OEM pricing—without sacrificing airworthiness or quality. For high-turn maintenance items like filters, brakes, and ignition components, PMA parts are an increasingly popular choice among cost-conscious operators.
USM Parts (Used Serviceable Material)
USM parts are previously installed components that have been removed from service, inspected, and documented as serviceable. These parts carry traceability records such as 8130-3 tags or equivalent documentation confirming their condition. USM is particularly valuable for legacy aircraft where new OEM parts may be discontinued or difficult to source.
How Korvian Helps
Korvian stocks a balanced mix of OEM, PMA, and certified USM parts to give operators real options. Every component ships with full documentation and traceability, whether it is a new OEM filter or a certified USM avionics accessory. Our goal is to help customers find the right part at the right price—without compromising on compliance or quality.
