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AIM
FIG 4
−
3
−
22
FIG 4
−
3
−
24
Cut Engines
Stop
FIG 4
−
3
−
23
Night Operation
Use same hand movements
as day operation
4
−
3
−
26. Operations at Uncontrolled
Airports With Automated Surface
Observing System (ASOS)/Automated
Weather Observing System (AWOS)
a.
Many airports throughout the National
Airspace System are equipped with either ASOS or
AWOS. At most airports with an operating control
tower or human observer, the weather will be
available to you in an Aviation Routine Weather
Report (METAR) hourly or special observation
format on the Automatic Terminal Information
Service (ATIS) or directly transmitted from the
controller/observer.
b.
At uncontrolled airports that are equipped with
ASOS/AWOS with ground
−
to
−
air broadcast capabil
ity, 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 Chart Supplement U.S. Some
part
−
time towered airports may also broadcast the
automated weather on their ATIS frequency during
the hours that the tower is closed.
c.
Controllers issue SVFR or IFR clearances
based on pilot request, known traffic and reported
weather, i.e., METAR/Nonroutine (Special) Aviation
Weather Report (SPECI) observations, when they are
available. Pilots have access to more current weather
Airport Operations
4
−
3
−
31