Which maintenance level is NOT associated with the performance of major overhauls?

The correct choice indicates that O-level maintenance is not associated with the performance of major overhauls.

O-level, or organizational level maintenance, is typically performed by the operational unit's personnel. This level focuses on daily and routine maintenance tasks, minor repairs, and inspections to ensure that aircraft and equipment are ready for immediate operations. The personnel at this level are trained to handle tasks that can be completed quickly without needing extensive resources.

In contrast, major overhauls and more complex maintenance tasks fall under intermediate level (I-level) and depot level (D-level) maintenance. I-level maintenance involves more extensive procedures, including comprehensive repairs or overhauls requiring specialized equipment and trained technicians. Depot level maintenance is the highest tier, dealing with significant refurbishment, overhaul, and repair efforts that can take more time and resources.

Therefore, O-level maintenance is mainly focused on readiness and minor maintenance tasks rather than the in-depth and extensive work involved in major overhauls, which aligns with the correct answer choice.