ICAO Annex 10 Volume II
5.1.8 Categories of messages
The categories of messages handled by the aeronautical mobile service and the order of priority in the establishment communications and the transmission of messages shall be in accordance with the following table.
Message category and order of priority signal | Radiotelephony signal |
| MAYDAY |
| PAN, PAN or PAN, PAN MEDICAL |
| ___ |
| ___ |
| ___ |
| ___ |
Note 1: Messages concerning acts of unlawful interference constitute a case of exceptional circumstances which may preclude the use of recognized communication procedures used to determine message category and priority.
Note 2: A NOTAM may qualify for any of the categories or priorities c) to f) inclusive. The decision as to which priority will depend on the contents of the NOTAM and its importance to the aircraft concerned.
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This question has appeared on the real examination, you can find the related countries below.
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Austro Control9
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Slovenia1
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Sweden1