Aeronautical mobile service (short: AMS; also: aeronautical mobile radiocommunication service') is – according to Article 1.32 of the International Telecommunication Union's (ITU) Radio Regulations (RR) – defined as "A mobile service between aeronautical stations and aircraft stations, or between aircraft stations, in which survival craft stations may participate; emergency position-indicating radiobeacon stations may also participate in this service on designated distress and emergency frequencies."
Variations of this radiocommunication service in line to the ITU Radio Regulations article 1 are as follows :
Mobile service (article 1.24)
- Aeronautical mobile service (article 1.32)
(R)° = abbreviation to route flights (route)
(OR)°° = abbreviation to flights others than on routes (off-route)
The allocation of radio frequencies is provided according to Article 5 of the ITU Radio Regulations (edition 2012).
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.
- primary allocation: is indicated by writing in capital letters (see example below)
- secondary allocation: is indicated by small letters
- exclusive or shared utilization: is within the responsibility of administrations
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 the NATO Joint Civil/Military Frequency Agreement (NJFA).
- Example of frequency allocation
|Allocation to services|
|Region 1||Region 2||Region 3|
|2 850–3 155 MHz|
|3 025–3 025 |
|On-Route (R)||Off-Route (OR)|
|2850||–||3025 kHz||3025||–||3155 kHz|
|3400||–||3500 kHz||3500||–||3950 kHz|
|4650||–||4700 kHz||4700||–||4850 kHz|
|5450||–||5480 kHz||5450||–||5480 kHz|
|5480||–||5680 kHz||5480||–||5730 kHz|
|6525||–||6685 kHz||6685||–||6765 kHz|
|8815||–||8965 kHz||8965||–||9040 kHz|
|10005||–||10100 kHz||11175||–||11275 kHz|
|11275||–||11400 kHz||13200||–||13260 kHz|
|13260||–||13360 kHz||15010||–||15100 kHz|
|17900||–||17970 kHz||17970||–||18030 kHz|
|21924||–||22000 kHz||23200||–||23350 kHz|
- ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.32, definition: aeronautical mobile service / aeronautical mobile radiocommunication service
- ITU Radio Regulations, CHAPTER II – Frequencies, ARTICLE 5 Frequency allocations, Section IV – Table of Frequency Allocations