NM.TR.105 Allocation and use of Mode S interrogator codes

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

NM.TR.105 Allocation and use of Mode S interrogator codes Regulation (EU) 2023/1771 (a) The Network Manager shall have a procedure in place that ensures that the interrogator code allocation system: (1) checks interrogator code applications for compliance with the applicable format and data conventions; (2) checks interrogator code applications for completeness, accuracy, and timeliness; (3) within maximum 6 calendar months from the date of application: (i) performs interrogator code allocation plan update simulations on the basis of the pending applications; (ii) prepares a proposed update of the interrogator code allocation plan for approval by the Member States affected by it; (iii) ensures that the proposed update to the interrogator code allocation plan meets, to the greatest extent possible, the operational requirements of the interrogator code applications, as described by key items (7), (8) and (9) listed in point (b) of point [CNS.TR.205](#_DxCrossRefBm647743341); (iv) updates, and communicates to Member States, the interrogator code allocation plan immediately after its approval, without prejudice to national procedures for the communication of information on Mode S interrogators operated by the military. (b) The Network Manager shall take the necessary measures to ensure that military units that operate eligible Mode S interrogators on any interrogator code other than II code 0, and other codes reserved for military management, comply with the requirements on the allocation and use of Mode S interrogator codes. (c) The Network Manager shall take the necessary measures to ensure that military units that operate Mode S interrogators on II code 0, or other interrogator codes reserved for military management, monitor the exclusive use of these interrogator codes to avoid the uncoordinated use of any eligible interrogator code (IC). (d) The Network Manager shall take the necessary measures to ensure that the allocation and use of interrogator codes for military units has no detrimental impact on the safety of general air traffic.