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configurable and default duration is 30 seconds.
2.1.7.2.1 General Description
The AAD is a multi-line read-only display having the following features:
• Threshold wind data can be selected and displayed for each runway
• Displays LLWAS messages in a syntax that is configurable. (This
• allows easy changes to be made to the system's output without changing
the software).
• Displays a database-configurable number of rows and columns per
• display.
• Status information is displayed on the AAD.
• Centrefield & alarm information is displayed on the AAD.
• Audible alarm, which sounds at full volume. (Users can adjust the
• volume using a volume control).
• A configurable flashing/hi-lighting method can be selected for new
messages.
• Can be configured to indicate alarm updates for particular thresholds for a
specified period of time.
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LLWAS
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• The system time is displayed on the AAD.
• Auto-scales character size to the selected AAD object size. (The font is
configurable).
• Displays a configurable Communication Failure message if the server is
not found after a timeout period.
• Displays missing wind data as a configurable value.
• Does not display any persisted data. (No LLWAS messages or wind
information is persisted).
• All configurable parameters have a default setting.
While the AAD reports the status of single data elements, these elements can
be configured to use backup sensors for centrefield and threshold winds,
providing ATC with constant data.
2.1.7.2.2 The Screen
All parameters on the AAD are configurable, including the ten available
display lines (8 message + 2 status), colours & highlighting rules, audible alarm
and line formats.
Each message line provides 6 possible items of information:
1. Runway identifier
2. Alert type
3. Wind speed gain or loss
4. Location of windshear or microburst
5. Threshold wind direction and speed
6. Possible alarm outside the network zone
When the system is operating normally, line 9 (second-last line from the
bottom) is blank. If a problem occurs, the text DEGRADED, SUPPORT,
INITIALIZATION or OFF is displayed, to indicate the state of the system.
Line 10 is reserved for LLWAS system messages. When there is active
communication between the server (master station) and AAD, the following
information is displayed:
• Centrefield wind direction and speed
• Centrefield gust speed
• System time (in UTC)
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LLWAS
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• Audible alarm state (On or Off)
If no information is received from the server within a configurable time period,
the AAD will blank and display “COMMUNICATION FAILURE” on line 10.
The following identifiers are used in the AAD:
A Approach
D Departure
LA Left approach
LD Left departure
RA Right approach
RD Right departure
CA Centre arrival
CD Centre departure
ALM Alarm
MBA Microburst alarm
WSA Windshear alarm
G Gust
K Knots (wind speed)
+/- Gain or loss (change in windspeed)
CF Centrefield
MF Nautical “Miles Final” (final approach)
MD Nautical “Miles Departure”
(departure corridor)
RWY Location (runway)
* Possible alarm outside the network zone
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Figure 2-7 is a typical example of an AAD.
Figure 2-7 Typical AAD
Referring to the example display above, line 1 provides the following
information:
10A Operational runway “10 Arrival”
WSA Windshear alarm
46K+ Estimated wind speed gain “46 knots”
2MF Location “2 nautical miles from final”
090 Threshold wind direction “90 degrees”
12 Threshold wind speed “12 knots”
No * is shown, therefore a windshear alarm outside the network area is not
indicated.
In the example, line 2 provides the following information:
10D Operational runway “10 Departure”
WSA Windshear alarm
20K- Estimated wind speed loss “20 knots”
RWY Location “Runway 10D”
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LLWAS
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090 Threshold wind direction “90 degrees”
12 Threshold wind speed “12 knots”
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