Which maintenance level is largely concerned with reworking major systems?

The D-level, or depot-level maintenance, focuses on extensive rework of complex and major systems. This maintenance level is equipped to handle tasks that involve significant overhauls, repairs, and modifications that go beyond the capabilities of the intermediate and organizational levels.

Depot-level facilities typically employ specialized technicians and have access to advanced machinery and tools needed for thorough inspections and repairs. They are responsible for ensuring that aircraft can meet operational readiness and safety standards over time, which often includes significant disassembly and reassembly of aircraft systems.

Understanding the division of maintenance responsibilities is crucial for effective aircraft maintenance management. The other levels are important as well, but they primarily address less complex repairs and routine maintenance tasks rather than those requiring such extensive capabilities and resource allocation found at the depot level.