The weight of which items is categorized under Operating Weight?

Operating Weight refers to the weight of an aircraft that accounts for all items necessary for it to operate, excluding any payload like passengers, cargo, or fuel. This weight includes the crew, baggage, and emergency equipment, as these are essential for the safe operation of the aircraft.

Crew members contribute to the overall weight since they are integral to the aircraft's operation. Baggage is included as it represents the personal items the crew or passengers bring aboard. Emergency equipment, such as life vests and fire extinguishers, is also critical for safety and must be accounted for in the operating weight.

The other options do not encapsulate the full scope of what Operating Weight includes. Nonexpendable items alone do not represent the entire operational requirement. Similarly, ballast and engine oil are necessary but are considered more specific components, not a holistic view of operating weight, which encompasses the entire operational setup including all essential personnel and equipment. Lastly, installed equipment alone does not account for the crew and baggage, which are crucial for defining the Operating Weight.