DFWD stands for which device?

• A. Digital free water detector
• B. Direct free water device
• C. Dynamic free water detector
• D. Digital free weight detector

Answer: (A)

DFWD refers to a device that monitors fuel for the presence of free water. Free water is liquid water that separates from fuel and can accumulate in tanks or lines, posing risks like corrosion, microbial growth, and fuel system malfunction. A detector like this uses sensors to sense water and then provides a digital signal or readout, often with alarms, so the crew can take action to drain or filter the water before it causes problems. The “digital” part is key because it implies a processed electronic output rather than a purely mechanical or analog indication, enabling clear displays or automated alerts. The term matches the acronym by combining Digital, Free Water, and Detector. The other phrasing would imply different concepts (direct, dynamic, or a weight measurement) that do not describe detecting free water in fuel.