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Data Color
(Day)
Data Color
(Night)
Status Description
Red slashes Modified red
slashes
Missing The data is not available because of problems in the
system, or the system has just been restarted and
there is not enough data available yet.
Blue Modified blue Backup Data is coming from a backup source.
Purple in italics Modified purple
in italics Manual Data is entered manually by the user using the manual
observations feature, for example, while maintenance
is fixing a sensor problem.
If the data field status is other than normal, see the troubleshooting instructions for some
general problem solving instructions. Check also the local practices at the airport.
More Information
‣
Day and Night Display Modes (page 33)
‣
Troubleshooting WeatherView (page 40)
4.2.4.2 Missing Values
In WeatherView, slashes in the data fields indicate missing data. Normally, missing values are
a sign of system problems. However, if the system has been restarted, for example, after
system maintenance, missing average values are a part of normal operation. When the CDUs
have been restarted, the statuses are as follows:
• Instant values appear immediately in WeatherView data fields, and their data status is
normal.
• Average values remain missing until the system has collected enough data to calculate
valid average values.
When the connection between a sensor and the CDU is broken, or when a sensor is out of
order, the data status on WeatherView screens turns first to "old".
Later the values will disappear from data fields and they are indicated as "missing" with
slashes.
• For instant values, the transition from "old" to "missing" happens very quickly.
• For average values the transition happens more slowly. The data remains in the data
fields until the system reaches the validation limit. Typically, the validation limit is
approximately 40 % of the entire average period. In a 2
‑
minute average, this would be
50 seconds. In a 10
‑
minute average, the validation limit would be 4 minutes. After the
validation limit is passed, values disappear from data fields. The system replaces them
with slashes (
///
).
4.2.4.3 Reported or System Data
If configured in your system, the WeatherView application may include the option of
comparing the current automatic system data and the data reported in the last METAR
report, including the manual changes.
Low-Level Windshear Alert System User Guide M210885EN-K
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