Aeronautical mobile service (short:AMS; alsoaeronautical mobile radiocommunication service) is a form ofaviation communication conducted throughradio. TheITU Radio Regulations divide AMS into communication used for civilair route flights (R) and off-route flights (OR). Aeronautical mobile (R) service is a so-calledsafety-of-life service, must be protected forinterferences, and is an essential part ofair traffic control. Communication occurs between radio stations onboard aircraft, termedaircraft stations, and terrestrial stations that are sometimes termed "aeronautical stations". Communication can also occur between aircraft.[1] AMS is commonly used inair traffic control.
Aeronauticalmobile satellite service (AMSS) is a form of AMS where an aircraft station is connected to acommunications satellite. It is useful in situations where the aircraft is far away from any radio station on land.[2]
The allocation of radio frequencies is provided according toArticle 5 of theITU Radio Regulations (edition 2012).[3]
In order to improve harmonisation in spectrum utilisation, the majority of service-allocations stipulated in this document were incorporated in national Tables of Frequency Allocations and Utilisations which is within the responsibility of the appropriate national administration. The allocation might be primary, secondary, exclusive, and shared.
However, military usage, in bands where there is civil usage, will be in accordance with the ITU Radio Regulations. In NATO countries military utilizations will be in accordance with theNATO Joint Civil/Military Frequency Agreement (NJFA).
| Allocation to services | ||
| Region 1 | Region 2 | Region 3 |
2 850–3 155 MHz
| ||
3 025–3 025
| ||
| On-Route (R) | Off-Route (OR) | |||||
|---|---|---|---|---|---|---|
| 2.850 | – | 3.025 MHz | 3.025 | – | 3.155 MHz | |
| 3.4 | – | 3.5 MHz | 3.5 | – | 3.95 MHz | |
| 4.65 | – | 4.7 MHz | 4.7 | – | 4.85 MHz | |
| 5.45 | – | 5.48 MHz | 5.45 | – | 5.48 MHz | |
| 5.48 | – | 5.68 MHz | 5.48 | – | 5.73 MHz | |
| 6.525 | – | 6.685 MHz | 6.685 | – | 6.765 MHz | |
| 8.815 | – | 8.965 MHz | 8.965 | – | 9.04 kHz | |
| 10.005 | – | 10.1 MHz | 11.175 | – | 11.275 MHz | |
| 11.275 | – | 11.4 MHz | 13.2 | – | 13.26 MHz | |
| 13.26 | – | 13.36 MHz | 15.01 | – | 15.1 MHz | |
| 17.9 | – | 17.97 MHz | 17.97 | – | 18.03 MHz | |
| 21.924 | – | 22 MHz | 23.2 | – | 23.35 MHz | |
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