The LLWAS system is comprised of a minimum of ______ stations.

• A. four
• B. six
• C. eight
• D. ten

Answer: (B)

LLWAS detects wind shear by comparing winds from several locations around the airport to a reference wind. Having multiple stations is essential because wind conditions can vary around the airfield and along different approach and departure directions. A network of six remote wind sensors provides coverage in multiple directions so the system can spot abnormal changes in speed or direction across different sectors around the field. With fewer sensors, gaps in coverage could hide shear in an unmonitored sector, making warnings less reliable. The central processor uses the readings from all the remote stations (and the reference) to identify significant differences that indicate low-level wind shear and then issues alerts. That broad, multi-directional coverage is why the minimum is set at six stations.