{"as_of":"2026-10-23","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Design","items":[{"count":38,"name":"Alexander Schleicher ASK 21","note":"","unit":"registered","url":"https://eflight.com/models/alexander-schleicher/ask-21"},{"count":163,"name":"Alexander Schleicher","note":"","unit":"aircraft on the register","url":"https://eflight.com/makers/alexander-schleicher"},{"count":null,"name":"Built of composite","note":"as the model family is built; the register does not record it per aircraft","unit":"","url":"https://eflight.com/materials/composite"}],"relation":"is a"},{"group":"Owner","items":[{"count":4,"name":"Greater Boston Soaring Club INC","note":"","unit":"aircraft registered to this organisation","url":"https://eflight.com/search?q=Greater Boston Soaring Club INC"}],"relation":"owned by"},{"group":"Place","items":[{"count":24,"name":"Sterling, MA","note":"","unit":"aircraft registered in this town","url":""},{"count":null,"name":"Sterling Airport","note":"3B3","unit":"","url":"https://eflight.com/airports/3B3"},{"count":2649,"name":"Massachusetts","note":"","unit":"aircraft registered","url":"https://eflight.com/states/MA"}],"relation":"registered in"},{"group":"Record","items":[{"count":null,"name":"No NTSB accident or incident record under this tail number","note":"","unit":"","url":"https://eflight.com/aircraft/N721RC#records-check"}],"relation":"involved in"},{"group":"Airworthiness","items":[{"count":13,"name":"FAA orders naming the Alexander Schleicher ASK 21","note":"","unit":"airworthiness directives","url":"https://eflight.com/models/alexander-schleicher/ask-21#airworthiness"},{"count":null,"name":"Report filed on this aircraft: Floorbeam, damaged","note":"1999-09-20","unit":"","url":"https://eflight.com/systems/structure"},{"count":null,"name":"Report filed on this aircraft: Frame, cracked","note":"1999-09-17","unit":"","url":"https://eflight.com/systems/structure"},{"count":null,"name":"Report filed on this aircraft: Keel Beam, corroded","note":"1999-09-15","unit":"","url":"https://eflight.com/systems/structure"}],"relation":"subject to"},{"group":"Analytics","items":[{"count":null,"name":"Accident history of the Alexander Schleicher ASK 21","note":"","unit":"","url":"https://eflight.com/models/alexander-schleicher/ask-21#accidents"},{"count":null,"name":"Accidents by model, with rates per thousand registered","note":"","unit":"","url":"https://eflight.com/analytics/accidents-by-model"}],"relation":"compared in"},{"group":"Live","items":[{"count":null,"name":"Where N721RC is now","note":"","unit":"","url":"https://eflight.com/live?q=N721RC"}],"relation":"seen at"}],"graph":"https://eflight.com/graph","graph_index":"https://eflight.com/graph/index.json","license":"https://creativecommons.org/licenses/by/4.0/","node":{"built_of":{"inherited_from_model":true,"material":"composite","name":"composite","note":"A glass- and carbon-fibre glider."},"id":"N721RC","maker":"Alexander Schleicher","model":"ASK 21","name":"Alexander Schleicher ASK 21 N721RC","state":"MA","type":"aircraft","url":"https://eflight.com/aircraft/N721RC","year_built":2015},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}
