Which term refers to an instrument or accessory used in operating an aircraft, installed in the aircraft, but not part of the airframe, engine, or propeller?

Which term refers to an instrument or accessory used in operating an aircraft, installed in the aircraft, but not part of the airframe, engine, or propeller?

• A. Air Traffic
• B. Appliance
• C. Air Transportation
• D. Alert Area

Answer: (B)

Understanding what an aircraft appliance is helps answer this. An instrument or accessory installed in the aircraft, but not part of the airframe, engine, or propeller, is called an appliance. This covers items added for operation or convenience—such as radios, gauges, electrical gear, or lighting—that aren’t built into the aircraft’s structure or propulsion system. The other terms don’t fit this definition: air traffic refers to the movement and control of aircraft, air transportation is the system of moving people or cargo, and an alert area is a type of designated airspace. So the word that matches the description is appliance.

Understanding what an aircraft appliance is helps answer this. An instrument or accessory installed in the aircraft, but not part of the airframe, engine, or propeller, is called an appliance. This covers items added for operation or convenience—such as radios, gauges, electrical gear, or lighting—that aren’t built into the aircraft’s structure or propulsion system.

The other terms don’t fit this definition: air traffic refers to the movement and control of aircraft, air transportation is the system of moving people or cargo, and an alert area is a type of designated airspace. So the word that matches the description is appliance.