What is the focus of the O-level maintenance activities?

The focus of O-level maintenance activities is on routine maintenance and repairs. This level of maintenance is primarily concerned with the day-to-day upkeep of aircraft to ensure their safety, reliability, and operational readiness. O-level maintenance activities typically include inspections, servicing, minor repairs, and the replacement of parts that can be conducted at the operating site. This level is essential for keeping the aircraft in a state of readiness and responding to immediate upkeep needs.

This distinguishes O-level maintenance from other levels, such as D-level maintenance, which is focused on more extensive overhauls and major modifications, and is usually performed at specialized facilities, rather than directly at the operational site.