a defined surface intended for the purpose of determining those obstacles to be considered in the calculation of obstacle clearance altitude/height for a specified ILS (instrument landing system) facility and procedure
a defined surface intended for the purpose of determining those obstacles to be considered in the calculation of obstacle clearance altitude/height for a specified ILS (instrument landing system) facility and procedure
OAS 1 . Lennunduse terminibaas. Eesti Keele Instituut, Sõnaveeb 2026. https://127.0.0.1:5577/search/unif//len/OAS/1/eng (09.10.2026)
