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The mode_a.xml file defines the SSR codes to be allocated to departing and transiting aircraft when a code allocation or change is necessary. The file is composed of two sections, the first one feeding the blocks that may be used, the second one defining the allocation rules.
The mode_a.xml file is located in the fir/ directory
| Root Element | blocks | |
|---|---|---|
| Element | block | |
| Attribute | Format | Remarks |
| id | string | Unique ID of code range |
| first | integer | First code available in range |
| last | integer | Last code available in range |
| Root Element | assignment | |
|---|---|---|
| Element | ssr | |
| Attribute | Format | Remarks |
| block | string | ID of code range defined in <blocks> |
| fr | V / I / IV | Flight Rules (I = IFR, V= VFR) |
| ty | string | Type of flight (SGM etc) |
| atc | string | Controlling unit which assigns the code |
| adep | string | Departure aerodrome (1, 2, 3, 4 characters of ICAO code = EB or EBBR) |
| ades | string | Arrival aerodrome (1, 2, 3, 4 characters of ICAO code = EB or EBBR) |
| sid | string | Assigned departure route |
| minrfl | integer | Lowest requested flight level |
| maxrfl | integer | Highest requested flight level |
Note that this file has not been finalised, format changes may occur