Which maintenance level primarily involves inspecting and servicing aircraft parts?

The maintenance level that primarily involves inspecting and servicing aircraft parts is O-level, or organizational level maintenance. This is the first level of maintenance performed by operating units where the personnel are trained to conduct routine inspections, servicing, and minor repairs on aircraft. O-level maintenance ensures that aircraft are ready for operational use by performing preventive maintenance and routine checks to ensure all systems are functioning correctly.

O-level maintenance is essential as it allows for immediate attention to aircraft issues while avoiding unnecessary delays in operations. It encompasses tasks such as fluid checks, lubrication, and minor adjustments, which help keep the aircraft in service and improve its reliability.

In contrast, I-level maintenance, or intermediate level, involves more in-depth inspections and repairs that cannot be handled at the O-level. D-level maintenance, or depot level maintenance, typically involves significant overhauls and refurbishments, requiring extensive facilities and specialized equipment. Therefore, identifying O-level as the maintenance level focused on inspecting and servicing is accurate within the context of aircraft and their maintenance requirements.