Which of the following is a condition that defines an AOC?

The definition of an AOC, or Abnormal Operating Condition, is centered around any condition that indicates a deviation from the normal operational parameters of a system. This includes instances where the operations deviate from established norms, such as pressure, temperature, or flow rates that differ from what is expected during standard operation. Recognizing AOCs is crucial for ensuring safety and mitigating risks, as it prompts appropriate response actions to prevent accidents or system failures.

While prescribed operational limits and minor adjustments might relate to operational practices, they do not specifically categorize something as an AOC. AOC is more concerned with changes that signify issues or irregularities that could lead to further complications if not addressed. Similarly, a successful maintenance task, while important for system reliability, does not signify an abnormal condition.