{"as_of":"2026-10-23","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Design","items":[{"count":1,"name":"Dittmar Heini","note":"","unit":"aircraft on the register","url":"https://eflight.com/makers/dittmar-heini"}],"relation":"is a"},{"group":"Owner","items":[{"count":148,"name":"Western Antique Aeroplane & Automobile Museum","note":"","unit":"aircraft in the fleet","url":"https://eflight.com/fleets/western-antique-aeroplane-automobile-museum"}],"relation":"owned by"},{"group":"Place","items":[{"count":337,"name":"Hood River, OR","note":"","unit":"aircraft registered in this town","url":""},{"count":null,"name":"Ken Jernstedt Airfield","note":"4S2","unit":"","url":"https://eflight.com/airports/4S2"},{"count":7020,"name":"Oregon","note":"","unit":"aircraft registered","url":"https://eflight.com/states/OR"}],"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/N51HD#records-check"}],"relation":"involved in"},{"group":"Live","items":[{"count":null,"name":"Where N51HD is now","note":"","unit":"","url":"https://eflight.com/live?q=N51HD"}],"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":null,"id":"N51HD","maker":"Dittmar Heini","model":"CONDOR IV","name":"Dittmar Heini CONDOR IV N51HD","state":"OR","type":"aircraft","url":"https://eflight.com/aircraft/N51HD","year_built":1951},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}