ASDE is most accurately described as which of the following?

• A. Airport Surveillance Detection Engine
• B. Automated Surface Data Evaluator
• C. Airfield Surface Detection Equipment
• D. Airport Surface Detection Equipment

Answer: (D)

ASDE stands for Airport Surface Detection Equipment. It is a surveillance system that uses surface movement radar to detect and display aircraft and ground vehicles operating on the airport’s movement area, such as runways and taxiways, so air traffic controllers can monitor positions and prevent runway incursions. The official term uses “Airport” rather than “Airfield,” and it specifically describes detection and display of surface movements rather than other functions. The other wordings don’t reflect the established name or purpose of the system. Modern versions, like ASDE-X, integrate additional sensors to improve coverage and accuracy, but the core idea remains: detect and present surface movements to enhance safety on the airport surface.