What type of inspection might require cleanliness controls during maintenance?

Cleanliness controls during maintenance are essential across various stages of the inspection process, particularly during initial, in-process, and final inspections. Each of these stages can introduce potential contaminants or residues that could affect the quality and performance of the product or system being inspected.

During initial inspections, it's critical to ensure that components are free of contaminants before assembly or further processing. This sets the foundation for quality and helps to prevent issues that could arise later in production.

In-process inspections help catch any debris or unwanted materials that might accumulate during manufacturing or assembly. Implementing cleanliness control measures at this stage helps maintain the integrity of the product and ensures compliance with quality standards.

Finally, final inspections are vital to confirm that the finished product meets all necessary specifications and regulations. Cleanliness is a key aspect of this verification. If cleanliness is not controlled throughout the entire process, the risk of defects or failures increases, which can lead to costly recalls, repairs, or even safety hazards.

The other options suggest that cleanliness controls are only necessary at specific times, which does not address the comprehensive nature of quality assurance required throughout all inspection stages.