4.2.1 LLWAS Screen
WeatherView always includes one or more LLWAS screens. The LLWAS screen displays wind
data and windshear alerts in text format. The LLWAS screen includes a data row for each
runway. The following figure displays an example of an LLWAS screen.
Figure 3 WeatherView: LLWAS Screen
1
Runway name (including departure/arrival indicator)
2
Alert type (microburst or windshear alert)
3
Estimated headwind loss or gain (in knots)
4
Location of the first encounter with the alert condition
5
Wind direction at the threshold (in degrees)
6
Wind speed at the threshold (in knots)
In windshear or microburst alert situation, the letters
WSA
or
MBA
and the red alarm frame
indicate the alert situation. When there are no windshear alerts, only wind speed and wind
direction values for the runway are displayed. The sensors that send the wind speed and
wind direction data are located at the end of the runway, at the threshold. The sensor that
sends this threshold data is defined during installation.
The LLWAS screen text s are explained in the following table.
Table 6 WeatherView: LLWAS Screen Texts
Code
Explanation
A
Arrival.
C
Center runway (of 3 parallel runways).
CF
Centerfield.
Chapter 4 – WeatherView
19
Summary of Contents for CT25K
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