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AIM

10/12/17

7

−1−9

Meteorology

(b)

A review of airway NOTAMs, procedural

NOTAMs, and NOTAMs that are general in nature
and not tied to a specific airport/facility (for example,
flight advisories and restrictions, open duration
special security instructions, and special flight rules
areas), graphic notices, and other information
published in the NTAP.

(c)

Approximate density altitude data.

(d)

Information regarding such items as air

traffic services and rules, customs/immigration
procedures, ADIZ rules, search and rescue, etc.

(e)

GPS RAIM availability for 1 hour before

to 1 hour after ETA or a time specified by the pilot.

(f)

Other assistance as required.

c. Abbreviated Briefing.

Request an Abbreviat-

ed Briefing when you need information to
supplement mass disseminated data, update a
previous briefing, or when you need only one or two
specific items. Provide the briefer with appropriate
background information, the time you received the
previous information, and/or the specific items
needed. You should indicate the source of the
information already received so that the briefer can
limit the briefing to the information that you have not
received, and/or appreciable changes in meteorologi-
cal/aeronautical conditions since your previous
briefing. To the extent possible, the briefer will
provide the information in the sequence shown for a
Standard Briefing. If you request only one or two
specific items, the briefer will advise you if adverse
conditions are present or forecast. (Adverse condi-
tions contain both meteorological and/or aeronautical
information.) Details on these conditions will be
provided at your request. International data may be
inaccurate or incomplete. If you are planning a flight
outside of U.S. controlled airspace, the briefer will
advise you to check data as soon as practical after
entering foreign airspace, unless you advise that you
have the international cautionary advisory.

d. Outlook Briefing.

You should request an

Outlook Briefing whenever your proposed time of
departure is six or more hours from the time of the
briefing. The briefer will provide available forecast
data applicable to the proposed flight. This type of
briefing is provided for planning purposes only. You
should obtain a Standard or Abbreviated Briefing
prior to departure in order to obtain such items as

adverse conditions, current conditions, updated
forecasts, winds aloft and NOTAMs, etc.

e.

When filing a flight plan only, you will be asked

if you require the latest information on adverse
conditions pertinent to the route of flight.

f. Inflight Briefing.

You are encouraged to

obtain your preflight briefing by telephone or in
person before departure. In those cases where you
need to obtain a preflight briefing or an update to a
previous briefing by radio, you should contact the
nearest FSS to obtain this information. After
communications have been established, advise the
specialist of the type briefing you require and provide
appropriate background information. You will be
provided information as specified in the above
paragraphs, depending on the type of briefing
requested. En Route advisories tailored to the phase
of flight that begins after climb-out and ends with
descent to land are provided upon pilot request. Pilots
are encouraged to provide a continuous exchange of
information on weather, winds, turbulence, flight
visibility, icing, etc., between pilots and inflight
specialists. Pilots should report good weather as well
as bad, and confirm expected conditions as well as
unexpected. Remember that weather conditions can
change rapidly and that a “go or no go” decision, as
mentioned in paragraph 7

−1−4b2, should be assessed

at all phases of flight.

g.

Following any briefing, feel free to ask for any

information that you or the briefer may have missed
or are not understood. This way, the briefer is able to
present the information in a logical sequence, and
lessens the chance of important items being
overlooked.

7

−1−6. Inflight Aviation Weather Advisories

a. Background

1.

Inflight Aviation Weather Advisories are

forecasts to advise en route aircraft of development of
potentially hazardous weather. Inflight aviation
weather advisories in the conterminous U.S. are
issued by the Aviation Weather Center (AWC) in
Kansas City, MO, as well as 20 Center Weather
Service Units (CWSU) associated with ARTCCs.
AWC also issues advisories for portions of the Gulf
of Mexico, Atlantic and Pacific Oceans, which are
under the control of ARTCCs with Oceanic flight
information regions (FIRs). The Weather Forecast
Office (WFO) in Honolulu issues advisories for the

2/28/19

AIM