{"id":"S85057451","label":"Ground controlled approach","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85057451","normalized_label":"ground controlled approach","broader":["http://id.loc.gov/authorities/subjects/sh85002834","http://id.loc.gov/authorities/subjects/sh85066767","http://id.loc.gov/authorities/subjects/sh85074368","http://id.loc.gov/authorities/subjects/sh85110308"],"aliases":["Blind landing","GCA (Ground controlled approach)","Talk-down system"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85057451","provider":"lcsh","revision":"9c2060db86eabaa8","taxonomy_revision":"f050b5d4780b1289","title":"Ground controlled approach","url":"/topics/S85057451","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"9547785433782830656","address_version":"morton4x16-v1","coordinates":[0,20,18302,44032],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}