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increase airport capacity.
c) This system is currently under development and
is operating in a developmental test status at the
Albuquerque, New Mexico, airport. When fielded,
the WSP is expected to be installed at 34 airports
across the nation, substantially increasing the safety
of flying.
25.6.1.7 Operational Aspects of LLWAS, TDWR,
and WSP
To demonstrate how this data is used by both the
controller and the pilot, 3 ribbon display examples
and their explanations are presented:
a) MICROBURST ALERTS
EXAMPLEThis
is what the controller sees on his/her ribbon display
in the tower cab.
27A MBA 35K- 2MF 250 20
NOTE-
(See FIG GEN 3.5-13 to see how the TDWR/WSP
determines the microburst location).
This is what the controller will say when issuing the
alert.
PHRASEOLOGYRUNWAY
27 ARRIVAL, MICROBURST ALERT, 35 KT
LOSS 2 MILE FINAL, THRESHOLD WINDS 250 AT 20.
In plain language, the controller is telling the pilot
that on approach to runway 27, there is a microburst
alert on the approach lane to the runway, and to
anticipate or expect a 35-knot loss of airspeed at
approximately 2 miles out on final approach (where
the aircraft will first encounter the phenomena). With
that information, the aircrew is forewarned, and
should be prepared to apply wind shear/microburst
escape procedures should they decide to continue the
approach. Additionally, the surface winds at the
airport for landing runway 27 are reported as
250degrees at 20 knots.
NOTEThreshold
wind is at pilot's request or as deemed
appropriate by the controller.
b) WIND SHEAR ALERTS
EXAMPLEThis
is what the controller sees on his/her ribbon display
in the tower cab.
27A WSA 20K- 3MF 200 15
NOTE-
(See FIG GEN 3.5-14 to see how the TDWR/WSP
determines the wind shear location).
This is what the controller will say when issuing the
alert.
PHRASEOLOGYRUNWAY
27 ARRIVAL, WIND SHEAR ALERT, 20 KT
LOSS 3 MILE FINAL, THRESHOLD WINDS 200 AT 15.
In plain language, the controller is advising the
aircraft arriving on runway 27 that at 3 miles out the
pilot should expect to encounter a wind shear
condition that will decrease airspeed by 20 knots and
possibly the aircraft will encounter turbulence.
Additionally, the airport surface winds for landing
runway 27 are reported as 200 degrees at 15 knots.
NOTEThreshold
wind is at pilot's request or as deemed
appropriate by the controller.
30 AUG 07
AIP
United States of America
GEN 3.5-49
15 MAR 07
Federal Aviation Administration Nineteenth Edition
FIG GEN 3.5-13
FIG GEN 3.5-14
30 AUG 07
AIP
United States of America
GEN 3.5-50
15 MAR 07
Nineteenth Edition Federal Aviation Administration
FIG GEN 3.5-15
c) MULTIPLE WIND SHEAR ALERTS
EXAMPLEThis
is what the controller sees on his/her ribbon display
in the tower cab.
27A WSA 20K+ RWY 250 20
27D WSA 20K+ RWY 250 20
NOTE-
(See FIG GEN 3.5-15 to see how the TDWR/WSP
determines the gust front/wind shear location).
This is what the controller will say when issuing the
alert.
PHRASEOLOGYMULTIPLE
WIND SHEAR ALERTS.
RUNWAY 27 ARRIVAL, WIND SHEAR ALERT, 20 KT
GAIN ON RUNWAY;
RUNWAY 27 DEPARTURE, WIND SHEAR ALERT, 20 KT
GAIN ON RUNWAY, WINDS 250 AT 20.
EXAMPLEIn
this example, the controller is advising arriving and
departing aircraft that they could encounter a wind shear
condition right on the runway due to a gust front
(significant change of wind direction) with the possibility
of a 20 knot gain in airspeed associated with the gust front.
Additionally, the airport surface winds (for the runway in
use) are reported as 250 degrees at 20 knots.
25.6.1.8 The Terminal Weather Information for
Pilots System (TWIP)
a) With the increase in the quantity and quality of
terminal weather information available through
TDWR, the next step is to provide this information
directly to pilots rather than relying on voice
communications from ATC. The National Airspace
System has long been in need of a means of delivering
terminal weather information to the cockpit more
efficiently in terms of both speed and accuracy to
enhance pilot awareness of weather hazards and to
reduce air traffic controller workload. With the TWIP
capability, terminal weather information, both
30 AUG 07
AIP
United States of America
GEN 3.5-51
15 MAR 07
Federal Aviation Administration Nineteenth Edition
alphanumerically and graphically, is now available
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