What characterizes a special inspection?

A special inspection is characterized by having a prescribed interval other than daily or phase inspections. This means that a special inspection is scheduled based on specific criteria or requirements that aren't strictly tied to the routine daily checks or phase maintenance schedules. These inspections are typically established due to conditions that warrant extra attention, such as manufacturer recommendations, regulatory standards, or findings during regular inspections.

Since they are not performed daily or tied to predefined phases of maintenance, it allows for flexibility in maintenance schedules while ensuring that the aircraft remains airworthy. This type of inspection is crucial for identifying potential issues that may not be apparent during standard inspections, ensuring the safety and reliability of the aircraft during its operation. Other options do not accurately capture the nature or purpose of special inspections, thus reinforcing the importance of having a defined schedule rather than a random or flight-dependent inspection process.