11/3/22
AIM
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.)
TBL 4
−
1
−
3
Other Frequency Usage Designated by FCC
Use
Frequency
Air-to-air communication
(private fixed wing aircraft).
122.750
Helicopter air
−
to
−
air
communications; air traffic control
operations.
123.025
Aviation instruction, Glider, Hot Air
Balloon
(not to be used for
advisory service)
.
123.300
123.500
Assignment to flight test land and
aircraft stations (not for air
−
to
−
air
communication except for those
aircraft operating in an oceanic
FIR).
123.400
1
123.450
2
1
This frequency is available only to itinerant stations that
have a requirement to be periodically transferred to various
locations.
2
Mobile station operations on these frequencies are limited
to an area within 320 km (200 mi) of an associated flight
test land station.
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.
Services Available to Pilots
4
−
1
−
7