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(National Aerospace Standard) is a critical technical specification that governs the installation and retention of bearings in aerospace applications through two primary methods:
The "NAS" designation indicates that this part meets the rigorous quality and dimensional standards required for flight-critical aerospace applications.
How to proceed (recommended steps)
Performance Verification: Outlines the Proof Load Testing procedures required to verify that the bearing is securely retained and can withstand specified axial loads without moving.
Published by the Aerospace Industries Association (AIA), NAS0331 provides comprehensive requirements for aerospace manufacturers and Maintenance, Repair, and Overhaul (MRO) facilities. The latest version, NAS0331 Revision 2, was released on July 31, 2020, and consists of approximately 46–48 pages of technical procedures and engineering data. Core Installation Methods