Mode S operators shall only operate an eligible Mode S interrogator, using an eligible interrogator code, if they have received an interrogator code allocation, for this purpose, from F1the CAA or the competent Member State.

Mode S operators intending to operate, or operating, an eligible Mode S interrogator for which no interrogator code allocation has been provided, shall submit an interrogator code application to the F2CAA, in accordance with the requirements specified in Annex II, Part A F3, unless a Member State is the competent Member State in relation to the operator.

Mode S operators shall comply with the key items of the interrogator code allocations they receive as listed in Annex II, Part B.

Mode S operators F4that have received an interrogator code allocation from the CAA shall inform the F5CAA at least every six 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 Annex II, Part B.

Mode S operators shall ensure that each of their Mode S interrogators uses exclusively its allocated interrogator code.