CNS.TR.205 Allocation and use of Mode S interrogator codes

• Regulation (EU) 2023/1771 found in: ATM/ANS Provision of Services (2017/373) (Mar 2025)

CNS.TR.205 Allocation and use of Mode S interrogator codes Regulation (EU) 2023/1771 (a) A surveillance services provider shall only operate an eligible Mode S interrogator, using an eligible interrogator code (IC), if it has received an interrogator code allocation, for this purpose, from the Member State concerned. (b) A surveillance services provider that intends to operate, or operates, an eligible Mode S interrogator for which no interrogator code allocation has been received, shall submit to the Member State concerned an interrogator code application, include the following key items, as a minimum: (1) a unique application reference from the Member State concerned; (2) full contact details of the Member State’s representative responsible for the coordination of the Mode S interrogator code allocation; (3) full contact details of the Mode S operator’s point of contact for Mode S IC allocation matters; (4) Mode S interrogator name; (5) Mode S interrogator use (operational or test); (6) Mode S interrogator location; (7) Mode S interrogator planned date of first Mode S transmission; (8) requested Mode S coverage; (9) specific operational requirements; (10) SI code capability; (11) “II/SI code operation” capability; (12) coverage map capability. (c) A surveillance services provider shall comply with the key items of the interrogator code allocations it has received, including the following items as a minimum: (1) the corresponding application reference from the Member State concerned; (2) a unique allocation reference from the interrogator code allocation service; (3) superseded allocation references, as required; (4) allocated interrogator code; (5) surveillance and lockout coverage restrictions under the form of sectored ranges or Mode S coverage map; (6) implementation period during which the allocation needs to be registered into the Mode S interrogator identified in the application; (7) implementation sequence which needs to be complied with; (8) optionally and associated with other alternatives: cluster recommendation; (9) specific operational restrictions, as required. (d) A surveillance services provider shall inform the Member State concerned at least every 6 months of any change in the installation planning or in the operational status of the eligible Mode S interrogators regarding any of the interrogator code allocation key items listed in point (c). (e) The surveillance services provider shall ensure that each of their Mode S interrogators uses exclusively its allocated interrogator code.