What type of maintenance involves making adjustments after observing failures or faults?

The correct choice is based on the nature of corrective maintenance, which is specifically designed to address issues that arise after a failure or fault has been identified. This type of maintenance focuses on identifying problems as they occur and implementing the necessary repairs to restore the system or equipment to its proper functioning state.

Corrective maintenance is typically performed in response to unexpected malfunctions, ensuring that equipment is quickly brought back online to minimize downtime and maintain operational efficiency. The emphasis is on the reaction to faults rather than on preventive measures or scheduled tasks.

In contrast, preventative maintenance involves routine inspections and proactive measures intended to prevent failures before they occur, while scheduled maintenance refers to planned work performed at predetermined intervals. Reactive maintenance is a broader term that can still include corrective actions but may not specifically focus on fixing faults as they arise; it can sometimes involve responding to other types of equipment issues without the structured approach of corrective maintenance.