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public).
122.750
122.850
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:
1. Revision to proposed departure time.
2. Takeoff, arrival, or flight plan cancellation
time.
3. 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.
d. Pilots should notify controllers on initial
contact that they have received the ATIS broadcast by
repeating the alphabetical code word appended to the
broadcast.
EXAMPLE−
“Information Sierra received.”
e. When a pilot acknowledges receipt of the ATIS
broadcast, controllers may omit those items contained
in the broadcast if they are current. Rapidly
changing conditions will be issued by ATC and the
ATIS will contain words as follows:
EXAMPLE−
“Latest ceiling/visibility/altimeter/wind/(other
conditions) will be issued by approach control/tower.”
AIM 2/19/04
4−1−8 Services Available to Pilots
NOTE−
The absence of a sky condition or ceiling and/or visibility
on ATIS indicates a sky condition or ceiling of 5,000 feet or
above and visibility of 5 miles or more. A remark may be
made on the broadcast, “the weather is better than
5000 and 5,” or the existing weather may be broadcast.
f. Controllers will issue pertinent information to
pilots who do not acknowledge receipt of a broadcast
or who acknowledge receipt of a broadcast which is
not current.
g. To serve frequency limited aircraft, FSSs are
equipped to transmit on the omnirange frequency at
most en route VORs used as ATIS voice outlets. Such
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AIM航空信息手册2004上(94)
