Which OPNAV Instruction serves as the basic document and authority in governing the management of aviation maintenance in the Navy?

The correct answer, NAMP 4790.2, serves as the foundational document for the management of aviation maintenance within the Navy. This instruction outlines the Naval Aviation Maintenance Program (NAMP) and provides a comprehensive framework that governs all aspects of aviation maintenance procedures, policies, and management across Navy aviation units.

NAMP 4790.2 establishes standard practices, ensuring consistency and accountability in aviation maintenance activities, which is crucial for operational readiness. It details the roles and responsibilities of personnel involved in aviation maintenance, the different maintenance levels, and the guidelines for various maintenance activities. This instruction is essential for maintaining the safety, reliability, and effectiveness of naval aviation assets, making it a cornerstone document for personnel involved in this mission.