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An abnormal operating condition is any departure from normal, safe operating conditions that requires actions to protect people, property, and service. It covers situations where process parameters stray outside approved limits, alarms or trips are triggered, or equipment behaves unexpectedly and could pose a risk. Think of events like a gas leak detected by a monitor, pressure or flow going out of control, overheating, or a control system failing to maintain setpoints. These scenarios demand protective actions to prevent harm or service disruption. This is different from routine maintenance, which is planned work done on a schedule and does not by itself indicate a safety deviation. It’s also different from a scheduled shutdown, which is a planned interruption, and from minor fluctuations that stay within expected variance and don’t require corrective action. Therefore, the statement that defines an AOC emphasizes any deviation that requires action to protect people, property, and service.