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(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


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

Hawaiian Islands and a large portion of the Pacific

Ocean. In Alaska, the Alaska Aviation Weather Unit

(AAWU) issues inflight aviation weather advisories

along with the Anchorage CWSU. All heights are