Obstacle Assessment Surface (OAS) 장애물평가표면 ICAO Doc 8697 장애물평가표면(OAS). 특정 계기착륙시설(ILS) 시설·절차에 대한 장애물이격고도/높이(OCA/H) 계산 시 고려되어야 할 해당 장애물(OBST)을 결정할 목적으로 의도된 정의된 표면.
Obstacle assessment surface. A defined surface intended for the purpose of determining those obstacles to be considered in the calculation of obstacle clearance altitude/height for a specific ILS facility and procedure.
출처 ICAO Doc 8697, "Aeronautical Chart Manual", Third Edition, 2016 ICAO Doc 8400, "ICAO Abbreviations and Codes", Ninth...
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