What should be done last during a 300-hour mechanical preventative maintenance inspection on a MEP 12?

During a 300-hour mechanical preventative maintenance inspection on a MEP 12, updating historical records should be done last for a few reasons. Firstly, this step is crucial to document all the maintenance activities that have been performed, ensuring an accurate maintenance history is maintained. This not only helps in tracking when parts were last replaced or serviced but also aids in scheduling future maintenance tasks.

Additionally, completing the other maintenance tasks first—such as performing a visual inspection, replacing filters, and cleaning the equipment—allows for accurate information to be recorded. After these actions, you can reflect on all the work completed, documenting details about the performance and condition of the equipment, the replacement parts used, and any other observations made during the inspection. This step serves as a comprehensive wrap-up of the inspection process, ensuring all pertinent information is captured while also providing a clear record for future reference. Thus, updating historical records logically follows the completion of all physical maintenance tasks.