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AIM

10/12/17

7−1−7

Meteorology

FIG 7−1−3

Aviation Cloud Forecast

7−1−5. Preflight Briefing

a. Flight Service Stations (FSS) are the primary

sources for obtaining preflight briefings and to file

flight plans by phone or the Internet. Flight Service

Specialists are qualified and certified as Pilot

Weather Briefers by the FAA. They are not authorized

to make original forecasts, but are authorized to

translate and interpret available forecasts and reports

directly into terms describing the weather conditions

which can be expected along the flight route and at the

destination. Three basic types of preflight briefings

(Standard, Abbreviated, and Outlook) are available

to serve the pilot’s specific needs. Pilots should

specify to the briefer the type of briefing they want,

along with their appropriate background information.

This will enable the briefer to tailor the information

to the pilot’s intended flight. The following

paragraphs describe the types of briefings available

and the information provided in each briefing.

REFERENCE−

AIM, Paragraph 5−1−1 , Preflight Preparation, for items that are

required.

b. Standard Briefing. You should request a

Standard Briefing any time you are planning a flight

and you have not received a previous briefing or have

not received preliminary information through mass

dissemination media; for example, in Alaska only,

TIBS and TWEB. 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. The

briefer will automatically provide the following

information in the sequence listed, except as noted,

when it is applicable to your proposed flight.

1. Adverse Conditions. Significant meteoro-

logical and/or aeronautical information that might

influence the pilot to alter or cancel the proposed

flight; for example, hazardous weather conditions,

airport closures, air traffic delays, etc. Pilots should

be especially alert for current or forecast weather

that could reduce flight minimums below VFR or

IFR conditions. Pilots should also be alert for any

reported or forecast icing if the aircraft is not certified

for operating in icing conditions. Flying into areas

of icing or weather below minimums could have

disastrous results.

2. VFR Flight Not Recommended. When

VFR flight is proposed and sky conditions or

visibilities are present or forecast, surface or aloft,

that, in the briefer’s judgment, would make flight

under VFR doubtful, the briefer will describe the

conditions, describe the affected locations, and use

the phrase “VFR flight not recommended.” This

2/28/19

AIM