LLWAS alerts may indicate wind shear outside the network.

• A. LLWAS alerts may indicate wind shear inside the network
• B. LLWAS alerts may indicate wind shear outside the network
• C. LLWAS alerts always indicate wind shear
• D. LLWAS alerts never indicate wind shear

Answer: (B)

LLWAS works by using a set of fixed wind sensors around the airfield and looking for a rapid difference in wind speed or direction between locations. When such a gradient is detected, an alert is issued for the surrounding air mass. Because this alert reflects conditions across the whole sensor network, it can point to wind-shear occurring outside the exact locations of the sensors themselves—i.e., outside the network footprint. That’s why LLWAS alerts may indicate wind shear outside the network. The other options don’t fit as well: the alert isn’t limited to only the sensor locations, it isn’t guaranteed to indicate wind shear every time, and it isn’t correct to say it never indicates wind shear.