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NOTEThe
LLWAS is designed to detect low level wind shear
conditions around the periphery of an airport. It does not
detect wind shear beyond that limitation.
REFERENCEFAAO
JO 7210.3, Para10-3-3, Low Level Wind Shear/Microburst
Detection Systems.
(a) If an alert is received, issue the airport
wind and the displayed field boundary wind.
PHRASEOLOGYWIND
SHEAR ALERT. AIRPORT WIND (direction) AT
(velocity). (Location of sensor) BOUNDARY WIND
(direction) AT (velocity).
(b) If multiple alerts are received, issue an
advisory that there are wind shear alerts in
two/several/all quadrants. After issuing the advisory,
issue the airport wind in accordance with para 3-9-1,
Departure Information, followed by the field
boundary wind most appropriate to the aircraft
operation.
PHRASEOLOGYWIND
SHEAR ALERTS TWO/SEVERAL/ALL
QUADRANTS. AIRPORT WIND (direction) AT (velocity).
(Location of sensor) BOUNDARY WIND (direction) AT
(velocity).
(c) If requested by the pilot, issue specific
field boundary wind information even though the
LLWAS may not be in alert status.
NOTEThe
requirements for issuance of wind information remain
valid as appropriate under this paragraph, para 3-9-1,
Departure Information and para 3-10-1, Landing
Information.
2. Wind shear detection systems, including
TDWR, WSP, LLWAS NE++ and LLWAS-RS
provide the capability of displaying microburst alerts,
wind shear alerts, and wind information oriented to
the threshold or departure end of a runway. When
detected, the associated ribbon display allows the
controller to read the displayed alert without any need
for interpretation.
(a) If a wind shear or microburst alert is
received for the runway in use, issue the alert
information for that runway to arriving and departing
aircraft as it is displayed on the ribbon display.
PHRASEOLOGY-
(Runway) (arrival/departure) WIND SHEAR/
MICROBURST ALERT, (windspeed) KNOT GAIN/LOSS,
(location).
EXAMPLE-
17A MBA 40K - 3MF
PHRASEOLOGYRUNWAY
17 ARRIVAL MICROBURST ALERT 40 KNOT
LOSS 3 MILE FINAL.
EXAMPLE-
17D WSA 25K+ 2MD
PHRASEOLOGYRUNWAY
17 DEPARTURE WIND SHEAR ALERT
25KNOT GAIN 2 MILE DEPARTURE.
(b) If requested by the pilot or deemed
appropriate by the controller, issue the displayed
wind information oriented to the threshold or
departure end of the runway.
PHRASEOLOGY-
(Runway) DEPARTURE/THRESHOLD WIND (direction)
AT (velocity).
(c) LLWAS NE++ or LLWAS-RS may detect
a possible wind shear/microburst at the edge of the
system but may be unable to distinguish between a
wind shear and a microburst. A wind shear alert
JO 7110.65S 2/14/08
3-1-4 General
message will be displayed, followed by an asterisk,
advising of a possible wind shear outside of the
system network.
NOTELLWAS
NE++ when associated with TDWR can detect
wind shear/microbursts outside the network if the TDWR
fails.
PHRASEOLOGY-
(Appropriate wind or alert information) POSSIBLE WIND
SHEAR OUTSIDE THE NETWORK.
(d) If unstable conditions produce multiple
alerts, issue an advisory of multiple wind shear/
microburst alerts followed by specific alert or wind
information most appropriate to the aircraft operation.
PHRASEOLOGYMULTIPLE
WIND SHEAR/MICROBURST ALERTS
(specific alert or wind information).
(e) The LLWAS NE++ and LLWAS-RS are
designed to operate with as many as 50percent of the
total sensors inoperative. When all three remote
sensors designated for a specific runway arrival or
departure wind display line are inoperative then the
LLWAS NE++ and LLWAS-RS for that runway
arrival/departure shall be considered out of service.
When a specific runway arrival or departure wind
display line is inoperative and wind shear/microburst
activity is likely; (e.g.; frontal activity, convective
storms, PIREPs), a statement shall be included on the
ATIS, “WIND SHEAR AND MICROBURST
INFORMATION FOR RUNWAY (runway number)
ARRIVAL/DEPARTURE NOT AVAILABLE.”
NOTEThe
geographic situation display (GSD) is a supervisory
planning tool and is not intended to be a primary tool for
microburst or wind shear.
3-1-9. USE OF TOWER RADAR DISPLAYS
a. Uncertified tower display workstations shall be
used only as an aid to assist controllers in visually
locating aircraft or in determining their spacial
relationship to known geographical points. Radar
services and traffic advisories are not to be provided
using uncertified tower display workstations.
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