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tions capabilities for aircraft flying at 5,000 feet

above ground level to 17,500 feet MSL on a common

frequency of 122.0 MHz. 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.


When 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 one hour
from the normal operating hours.


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 FSS communication frequencies

may be available at lower altitudes. See FIG 7−1−2.


Contact flight watch by using the name of the

ARTCC facility identification serving the area of

your location, followed by your aircraft identifica-

tion, and the name of the nearest VOR to your

position. The specialist needs to know this

approximate location to select the most appropriate

transmitter/receiver outlet for communications



Cleveland Flight Watch, Cessna One Two Three Four Kilo,
Mansfield V

−O−R, over.


Charts depicting the location of the flight watch

control stations (parent facility) and the outlets they

use are contained in the A/FD. 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.


Flight Watch, Cessna One Two Three Four Kilo,
Mansfield V

−O−R, over.


Radio outlets that provide En Route Flight

Advisory Service are listed regionally in the A/FDs.


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 aero-

drome forecasts will be provided on request. Pilots

requesting information not within the scope of flight

watch will be advised of the appropriate FSS

frequency to obtain the information. Pilot participa-

tion is essential to the success of EFAS by providing

a continuous exchange of information on weather,

winds, turbulence, flight visibility, icing, etc.,

between pilots and flight watch specialists. Pilots are

encouraged to report good weather as well as bad, and

to confirm expected conditions as well as unexpected

to EFAS facilities.



6. Inflight Aviation Weather Advisories

a. Background


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



There are three types of inflight aviation

weather advisories: the SIGMET, the Convective

SIGMET, and the AIRMET (text or graphical

product). All of these advisories use the same location

identifiers (either VORs, airports, or well−known

geographic areas) to describe the hazardous weather

areas. See FIG 7−1−3 and FIG 7−1−4. Graphics with

improved clarity can be found in the latest version of

Advisory Circular AC 00−45 series, Aviation Weath-

er Services, which is available on the following Web



Two other weather products supplement

these Inflight Aviation Weather Advisories:


The Severe Weather Watch Bulle-

tins (WWs), (with associated Alert Messages)

(AWW), and


The Center Weather Advisories (CWAs).




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