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management and protection, and
environmental monitoring and
protection.
122.925
Airports with a control tower or
FSS on airport.
122.950
NOTE-
1. In some areas of the country, frequency interference
may be encountered from nearby airports using the same
UNICOM frequency. Where there is a problem, UNICOM
operators are encouraged to develop a “least interference”
frequency assignment plan for airports concerned
using the frequencies designated for airports without
operating control towers. UNICOM licensees are
encouraged to apply for UNICOM 25 kHz spaced channel
frequencies. Due to the extremely limited number of
frequencies with 50 kHz channel spacing, 25 kHz channel
spacing should be implemented. UNICOM licensees may
then request FCC to assign frequencies in accordance with
the plan, which FCC will review and consider for approval.
2. Wind direction and runway information may not be
available on UNICOM frequency 122.950.
b. The following listing depicts other frequency
uses as designated by the Federal Communications
Commission (FCC). (See TBL 4-1-3.)
2/14/08 AIM
Services Available to Pilots 4−1−7
TBL 4−1−3
Other Frequency Usage Designated by FCC
Use Frequency
Air-to-air communication
(private fixed wing aircraft).
122.750
Air-to-air communications
(general aviation helicopters).
123.025
Aviation instruction, Glider, Hot Air
Balloon (not to be used for
advisory service).
123.300
123.500
4−1−12. Use of UNICOM for ATC Purposes
UNICOM service may be used for ATC purposes,
only under the following circumstances:
a. Revision to proposed departure time.
b. Takeoff, arrival, or flight plan cancellation
time.
c. ATC clearance, provided arrangements are
made between the ATC facility and the UNICOM
licensee to handle such messages.
4−1−13. Automatic Terminal Information
Service (ATIS)
a. ATIS is the continuous broadcast of recorded
noncontrol information in selected high activity
terminal areas. Its purpose is to improve controller
effectiveness and to relieve frequency congestion by
automating the repetitive transmission of essential
but routine information. The information is continuously
broadcast over a discrete VHF radio frequency
or the voice portion of a local NAVAID. ATIS
transmissions on a discrete VHF radio frequency are
engineered to be receivable to a maximum of 60 NM
from the ATIS site and a maximum altitude of
25,000 feet AGL. At most locations, ATIS signals
may be received on the surface of the airport, but local
conditions may limit the maximum ATIS reception
distance and/or altitude. Pilots are urged to cooperate
in the ATIS program as it relieves frequency
congestion on approach control, ground control, and
local control frequencies. The A/FD indicates
airports for which ATIS is provided.
b. ATIS information includes the time of the latest
weather sequence, ceiling, visibility, obstructions to
visibility, temperature, dew point (if available), wind
direction (magnetic), and velocity, altimeter, other
pertinent remarks, instrument approach and runway
in use. The ceiling/sky condition, visibility, and
obstructions to vision may be omitted from the ATIS
broadcast if the ceiling is above 5,000 feet and the
visibility is more than 5 miles. The departure runway
will only be given if different from the landing
runway except at locations having a separate ATIS for
departure. The broadcast may include the appropriate
frequency and instructions for VFR arrivals to make
initial contact with approach control. Pilots of aircraft
arriving or departing the terminal area can receive the
continuous ATIS broadcast at times when cockpit
duties are least pressing and listen to as many repeats
as desired. ATIS broadcast shall be updated upon the
receipt of any official hourly and special weather. A
new recording will also be made when there is a
change in other pertinent data such as runway change,
instrument approach in use, etc.
EXAMPLE−
Dulles International information Sierra. 1300 zulu
weather. Measured ceiling three thousand overcast.
Visibility three, smoke. Temperature six eight. Wind
three five zero at eight. Altimeter two niner niner two. ILS
runway one right approach in use. Landing runway one
right and left. Departure runway three zero. Armel
VORTAC out of service. Advise you have Sierra.
c. Pilots should listen to ATIS broadcasts
whenever ATIS is in operation.
　
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