Corrective maintenance is implemented right after a defect has been detected on a piece of equipment or a production line. As per the maintenance activity block diagram template, corrective maintenance can either be planned or unplanned depending on whether or not a maintenance plan has been created. A block diagram is a diagram of a system where the principal parts or functions are represented by blocks connected by lines that shows the relationships of the blocks. Instead of creating a maintenance activity block diagram from scratch, use EdrawMax pre-defined templates as it provides the right facts and figures that ease the entire process.