Which statement accurately defines Unforeseen Operational Circumstance?

• A. It is a planned event
• B. It is an unplanned event of insufficient duration to adjust schedules
• C. It is a forecasted weather event
• D. It is a routine delay with known cause

Answer: (B)

Unforeseen Operational Circumstance refers to an event that arises during operations without prior planning and that could not reasonably have been anticipated. Because it lasts too short to rework or adjust the flight schedule, crews must deal with it using temporary measures rather than a full schedule change. This distinguishes it from events that are planned, forecasted, or have a known cause that would allow re-sequencing or altering the plan.

So the statement that best matches this definition describes an unplanned event that is of insufficient duration to adjust schedules. The other descriptions describe planned events, forecasted conditions, or routine delays with known causes, which do not fit the term.