What is an inadvertent door or window opening in aviation?

• A. It refers to an unexpected opening of doors or windows that can compromise aircraft safety.
• B. It refers to a deliberately opened door for ventilation during flight.
• C. It refers to door latches failing at altitude only.
• D. It refers to door opening in ground operations only.

Answer: (A)

An inadvertent door or window opening means an unplanned, accidental opening of a door or window during flight. This is dangerous because the cabin is pressurized, so an unexpected opening can cause rapid depressurization, create large aerodynamic loads on the door and airframe, and expose people to wind blast and potential injury. The essence is unplanned, not intentional, so this option best fits the situation described. Deliberate openings, openings only at altitude due to a latch issue, or openings that occur only on the ground do not match the concept of an unplanned in-flight event.