AIM 4-1-11

Frequency use

The following listing depicts UNICOM and MULTICOM frequency uses as designated by the Federal Communications Commission (FCC). (See TBL 4-1-2 .) TBL 4-1-11 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-

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.

Wind direction and runway information may not be available on UNICOM frequency 122.950.

The following listing depicts other frequency uses as designated by the Federal Communications Commission (FCC). (See TBL 4-1-3 .) TBL 4-1-11 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.