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The ssr.xml file defines the SSR code blocks to be used and the SSR Code allocation rules used for departing or transiting aircraft when a code allocation or change is necessary. The file is composed of two sections, the first one defining the code blocks that shall be used, the second one defining the allocation rules.
The ssr.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