If LLWAS senses a problem at one or more sensors, the tower cab display will indicate '_____________' on the affected Line(s).

• A. STATION ERROR
• B. WIND SHIFT
• C. SENSOR FAULT
• D. LLWAS OFFLINE

Answer: (A)

LLWAS checks the data from multiple wind sensors along each line for consistency. When one or more sensors misbehave or produce data that doesn’t agree with neighboring stations, the system marks that entire line as STATION ERROR. That display tells the controller that the wind information from that line is unreliable and should not be used for wind-shear assessments until the issue is fixed. Wind shift would mean a real change in wind, not a sensor problem. A sensor fault is a hardware issue at a single unit, but the standard way LLWAS communicates this data problem to the cockpit is through a STATION ERROR on the affected line. LLWAS OFFLINE would mean the whole system isn’t operating, not just a single line’s sensor issue.