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õhusõidukile antud raadiosagedus, mida ta kasutab teisejärguliselt maapealse üksusega raadioside pidamisel, the radiotelephony frequency assigned to an aircraft as a second choice for air-ground communication in a radiotelephony network
secondary frequency . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/secondary%20frequency/1/eng (01.07.2026)
