Which component is NOT included in the standard empty weight of an aircraft?

The standard empty weight of an aircraft is defined as the weight of the aircraft with all of its operating equipment installed, the engine, and a full oil tank, but it does not include the weight of the passengers or their baggage. Standard empty weight is essentially the basic weight of the aircraft designed for flight operations without any payload.

Passengers and their baggage are considered variable weights and are not factored into the standard empty weight. This distinction is crucial for pilots as it helps them determine the maximum takeoff weight by adding the weight of the occupants and cargo to the standard empty weight, ensuring they remain within safe operational limits. Recognizing this helps in flight planning and compliance with weight and balance requirements.