WIND SHEAR- A change in wind speed and/or wind direction in a short distance resulting in a tearing or shearing effect. It can exist in a horizontal or vertical direction and occasionally in both.
WING TIP VORTICES-
(See VORTICES.)
WORDS TWICE-
a.
As a request: “Communication is difficult. Please say every phrase twice.”
b..
As information: “Since communications are difficult, every phrase in this message will be spoken twice.”
WORLD AERONAUTICAL CHARTS-
(See AERONAUTICAL CHART.)
WS-
(See SIGMET.)
(See WEATHER ADVISORY.)
WST-
(See CONVECTIVE SIGMET.)
(See WEATHER ADVISORY.)
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PILOT/CONTROLLER GLOSSARY 飛行員/管制員術語詞典
