sources of non-visible radiation or the presence of moving or fixed objects which may interfere with, or adversely affect, the performance of aeronautical communications, navigation and surveillance systems.
foinsí radaíochta dofheicthe nó nithe gluaiseachta nó nithe seasta a d'fhéadfadh cur isteach ar fheidhmíocht na gcóras cumarsáide, loingseoireachta agus faireachais aerloingseoireachta, nó a bhféadfadh drochthionchar a bheith acu ar an bhfeidhmíocht sin.