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the one−minute updated airport weather should be
available to you within approximately 25 NM of the
airport below 10,000 feet. The frequency for the
weather broadcast will be published on sectional
charts and in the Airport/Facility Directory. Some
part−time towered airports may also broadcast the
automated weather on their ATIS frequency during
the hours that the tower is closed.
9.8.3Controllers issue SVFR or IFR clearances
based on pilot request, known traffic and reported
weather; i.e., METAR/SPECI observations, when
they are available. Pilots have access to more current
weather at uncontrolled ASOS/AWOS airports than
do the controllers who may be located several miles
away. Controllers will rely on the pilot to determine
the current airport weather from the ASOS/AWOS.
All aircraft arriving or departing an ASOS/AWOS
equipped uncontrolled airport should monitor the
airport weather frequency to ascertain the status of
the airspace. Pilots in Class E airspace must be alert
for changing weather conditions which may effect the
status of the airspace from IFR/VFR. If ATC service
is required for IFR/SVFR approach/departure or
requested for VFR service, the pilot should advise the
controller that he/she has received the one−minute
weather and state his/her intentions.
EXAMPLE−
I have the (airport) one−minute weather, request an ILS
runway 14 approach."
REFERENCE−
Section GEN 3.5, Paragraph 7, Weather Observing Programs.
AIP
United States of America
GEN 3.4−1
15 MAR 07
Federal Aviation Administration Nineteenth Edition
GEN 3.4 Communication Service
1. Responsible Authority
1.1The authority responsible for the administration
of communications services in the U.S. is the Federal
Aviation Administration, Communication, Navigation,
Surveillance, and Infrastructure.
Postal Address:
Federal Aviation Administration
Communications, Navigation, Surveillance, and
Infrastructure (ARN−1 )
400 7th Street, SW
Washington, D.C. 20590
AFTN Address: KDCAYAYX
Commercial Telegraphic Address:
ACIVAIR Washington DC
Telex: 892−562
2. Area of Responsibility
2.1Communications services are available on a
continuous basis without charge to the user. The Air
Traffic Services Division is responsible for the
establishment of the operational requirements of the
U.S. communications system. Responsibility for the
day to day operation of these services resides with the
local air traffic facility. Enquiries or complaints
regarding any communications services or facilities
should be referred to the relevant air traffic facility or
to the Federal Aviation Administration, Air Traffic
Operations Services, as appropriate.
3. Types of Services
3.1Radio Navigation Service
3.1.1Various types of air navigation aids are in use
today, each serving a special purpose. These aids have
varied owners and operators, namely: the Federal
Aviation Administration, the military services,
private organizations; and individual states and
foreign governments. The Federal Aviation Administration
has the statutory authority to establish,
operate, and maintain air navigation facilities and to
prescribe standards for the operation of any of these
aids which are used by both civil and military aircraft
for instrument flight in federally controlled airspace.
These aids are tabulated in the Airport/Facility
Directory by State.
3.1.2Pilots should be aware of the possibility of
momentary erroneous indications on cockpit displays
when the primary signal generator for a ground−
based navigational transmitter (for example, a
glideslope, VOR, or nondirectional beacon) is
inoperative. Pilots should disregard any navigation
indication, regardless of its apparent validity, if the
particular transmitter was identified by NOTAM or
otherwise as unusable or inoperative.
3.1.3The following types of radio navigation aids
are provided in the U.S.:
3.1.3.1VHF Direction−Finding (VHF−DF).
3.1.3.2LF Non−Directional Beacon (NDB).
3.1.3.3VHF Omni−Directional Radio Range
(VOR).
3.1.3.4Distance Measuring Equipment (DME).
3.1.3.5Tactical Air Navigation (TACAN).
3.1.3.6Instrument Landing System (ILS).
3.1.3.7Final Approach Simplified Directional Facility
(SDF).
3.1.3.8Precision Approach Radar (PAR) at certain
military aerodromes.
3.1.3.9LORAN.
3.1.3.10Global Positioning System (GPS).
3.1.4NAVAID Service Volumes
　
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