AIM 4-1-11 Designated UNICOM/MULTICOM Frequencies
Chapter 4. Air Traffic Control · Section 1. Services Available to Pilots
A reference copy of the official AIM text for study. It is not legal advice or an FAA interpretation; always confirm against the current official source.
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.)
| 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 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.)
| 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.