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Since no * is displayed, no windshear alarm outside the network area is
indicated.
Lines 5, 6, 7 and 8 are unused in this example.
As the system is operating normally, line 9 remains blank.
Line 10 displays the following information:
CF Centrefield location
090 Wind direction “90 degrees”
16 Centerfield wind speed “16 knots”
G22 Centerfield wind gusting to “22 knots”
1046 System time 1046 UTC
ALM OFF Audible alarm is switched Off
2.1.7.2.3 Operation
During normal operation (no windshear alarms) the AAD displays Runway
Identification, Wind Direction and Wind Speed for each selected runway.
The bottom line of the display (line 10) shows Centerfield Wind Direction &
Speed, Gust Wind Speed, System Time (UTC) and Audible Alarm Status.
Figure 2-8 An AAD in normal operation, showing no alarms.
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When a wind threshold is reached, the information line associated with the
affected runway(s) will flash red for a predetermined period of time. The
information displayed will now include data relating to the alarm condition, as
described in section 2.1.7.2.2.
Figure 2-9 An AAD highlighting a “Microburst Alert” for runways 10A
and 28D, by flashing red for a predetermined period of time.
When the “highlighting” period has expired, the AAD will stop flashing and
display steady text information relating to the alarm condition.
Figure 2-10 An AAD displaying “Microburst alarm” information after the
highlighting period has expired.
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2.1.7.2.4 Runway Threshold Configuration Display
The Runway Threshold Configuration Display is an object that can be placed
on a screen containing an AAD. A drop-down list allows the user to select and
view any available display configuration.
Figure 2-11 AAD Configuration Drop-down List
Each configuration determines which runway windshear threshold
information is to be displayed on the AAD.
For example, if the user selects a configuration that shows the windshear
information for “Runway 10 Approach and Runway 28 Departure”, then the
AAD will only display windshear information relating to those two zones. The
other display lines will be left blank. This saves the ATC from having to
distinguish between their runway windshear thresholds and the rest of the
airport.
If “All Runways” is selected, then windshear information relating to all the
runways is displayed.
Once a configuration has been selected, this is shown on the Runway
Threshold Configuration Display as illustrated below.
Figure 2-12 Display Configuration Selection
2.1.7.3 Graphical Alarm Display Screens (GAD)
The GAD display consists of two separate screen objects, an AAD screen
object (described above) and a separate map display. Buttons at the bottom
of the screen allow selection of different background bitmaps as appropriate.
Because the map is a screen object, the GAD can be displayed with other data
as well, such as the Supervisor’s AAD Selector (described below).
The Almos Map display (GAD Object) consists of a background bitmap and
numerous graphical objects overlaid upon this background.
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Arrows
Arrows point where the wind is blowing ‘to’ by default. Sensors that are
marked out of scan or in a fault condition appear as a red circle.
Wind Speed Box
Next to each arrow, a floating wind speed box shows the current wind speed.
The box moves with the arrow in such a way so as to not obscure the arrow
itself.
Edge/Triangle Alarm displays
During divergence/convergence detection, a red line (shaded based on
strength) depicts the area in which the wind shear is being detected.
Combined with the AAD object already on screen, this provides an excellent
windshear warning system and situation display.
Figure 2-13 LLWAS Map (Normal Operation)
Triangles are displayed as shaded red areas. The degree of shading reflects the
intensity of windshear within that area.
A typical LLWAS Map showing areas affected by windshear is shown below.
Figure 2-14 LLWAS Map (Showing Windshear)
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2.1.8 Interfaces
The Almos LLWAS system offered supports interfaces of up to 256 remote
stations using the communications methods (radio and landline) described
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