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航行情报手册 Aeronautical Information Manual (AIM) 1(127)

时间:2011-04-18 00:47来源:蓝天飞行翻译 作者:航空 点击:


4.1.11. Designated UNICOM/MULTICOM Frequencies
Frequency use
a. The following listing depicts UNICOM and MULTICOM frequency uses as designated by the Federal Communications Commission (FCC). (See TBL 4.1.2.)
TBL 4.1.2
Unicom/Multicom Frequency Usage
Use  Frequency 
Airports without an operating control tower.  122.700 122.725 122.800 122.975 123.000 123.050 123.075 
(MULTICOM FREQUENCY) Activities of a temporary, seasonal, emergency nature or search and rescue, as well as, airports with no tower, FSS, or UNICOM.  122.900 
(MULTICOM FREQUENCY) Forestry management and fire suppression, fish and game 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 interfer-ence” 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.)
Services Available to Pilots
4.1.6
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 continu-ously 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.

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