Which of the following is not a type of spot check?

The choice is based on the understanding of the different types of checks that are utilized in a quality assurance context within the Navy 3-M System. Spot checks are typically used to evaluate the effectiveness and compliance of maintenance activities, ensuring that procedures are being followed correctly.

Historical spot checks are based on past performance and records, while maintenance validation spot checks specifically examine whether maintenance actions are being completed as per requirements. Monitored maintenance involves oversight during maintenance actions to ensure proper protocols are being adhered to.

In contrast, functional checks are distinct as they focus on assessing the operational capabilities of equipment or systems rather than evaluating compliance to maintenance processes. Therefore, functional checks do not fall under the category of spot checks aimed specifically at validating maintenance processes or adherence to standards. This distinction is crucial for understanding each type of check's role in quality assurance within the 3-M System.