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3.8 En Route Flight Advisory Service (EFAS)
3.8.1 EFAS is a service specifically designed to
provide en route aircraft with timely and meaningful
weather advisories pertinent to the type of flight
intended, route of flight, and altitude. In conjunction
with this service, EFAS is also a central collection and
distribution point for pilot-reported weather information.
EFAS is provided by specially trained
specialists in selected AFSSs/FSSs controlling
multiple remote communications outlets covering a
large geographical area and is normally available
throughout the conterminous U.S. and Puerto Rico
from 6 a.m. to 10 p.m. EFAS provides communications
capabilities for aircraft flying at 5,000 feet AGL
to 17,500 feet MSL on a common frequency of
122.0MHz. Discrete EFAS frequencies have been
established to ensure communications coverage from
18,000 through 45,000 MSL serving in each specific
ARTCC area. These discrete frequencies may be used
below 18,000 feet when coverage permits reliable
communication.
NOTEWhen
an EFAS outlet is located in a time zone different from
the zone in which the flight watch control station is located,
the availability of service may be plus or minus 1 hour from
the normal operating hours.
3.8.2 In some regions of the contiguous U.S.,
especially those that are mountainous, it is necessary
to be above 5000 feet AGL in order to be at an altitude
where the EFAS frequency, 122.0 MHz, is available.
Pilots should take this into account when flight
planning. Other AFSS communication frequencies
may be available at lower altitudes. See
FIG GEN 3.5-2.
3.8.3 Contact flight watch by using the name of the
ARTCC facility serving the area of your location,
followed by your aircraft identification and the name
of the nearest VOR to your position. The specialist
needs to know this approximate location to select the
most appropriate outlet for communications coverage.
EXAMPLECleveland
flight watch, Cessna One Three Four Two Kilo,
Mansfield V-O-R, over.
3.8.4 Charts depicting the location of the flight
watch control stations (parent facility) and the outlets
they use are contained in the Airport/Facility
Directory. If you do not know in which flight watch
area you are flying, initiate contact by using the words
“FLIGHT WATCH,” your aircraft identification, and
the name of the nearest VOR. The facility will
respond using the name of the flight watch facility.
EXAMPLEFlight
watch, Cessna One Two Three Four Kilo, Mansfield
V-O-R, over.
3.8.5 The AFSSs/FSSs which have implemented
EnRoute Flight Advisory Service are listed in the
Airport/Facility Directory.
3.8.6 EFAS is not intended to be used for filing or
closing flight plans, position reporting, getting
complete preflight briefings, or obtaining random
weather reports and forecasts. En route flight
advisories are tailored to the phase of flight that
begins after climb-out and ends with descent to land.
Immediate destination weather and terminal airport
forecasts will be provided on request. Pilots
requesting information not within the scope of flight
watch will be advised of the appropriate AFSS/FSS
frequency to contact to obtain the information. Pilot
participation is essential to the success of EFAS by
providing a continuous exchange of information on
weather, winds, turbulence, flight visibility, icing or
other hazardous conditions between pilots and flight
watch specialists. Pilots are encouraged to report
good weather as well as bad, and to confirm both
expected conditions and unexpected conditions to
EFAS facilities.
3.9 Inflight Aviation Weather Advisories
3.9.1 Background
3.9.1.1 Inflight Aviation Weather Advisories are
forecasts to advise en route aircraft of development of
potentially hazardous weather. All inflight aviation
weather advisories in the conterminous U.S. are
issued by the Aviation Weather Center (AWC) in
Kansas City, Missouri. The Weather Forecast
Office(WFO) in Honolulu issues advisories for the
Hawaiian Islands. In Alaska, the Alaska Aviation
Weather Unit (AAWU) issues inflight aviation
weather advisories. All heights are referenced MSL,
except in the case of ceilings (CIG) which indicate
AGL.
30 AUG 07
AIP
United States of America
GEN 3.5-10
15 MAR 07
Nineteenth Edition Federal Aviation Administration
3.9.1.2 There are three types of inflight aviation
weather advisories: the Significant Meteorological
Information (SIGMET), the Convective SIGMET
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