{"as_of":"2026-11-12","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Design","items":[{"count":146,"name":"Md Helicopters Inc","note":"","unit":"aircraft on the register","url":"https://eflight.com/makers/md-helicopters-inc"},{"count":12,"name":"Md Helicopters Inc 600N","note":"","unit":"registered","url":"https://eflight.com/models/md-helicopters-inc/600?variant=600N"},{"count":null,"name":"Type certificate H3WE","note":"held by MD Helicopters INC (Mdhi)","unit":"","url":""},{"count":null,"name":"Built of aluminium","note":"","unit":"","url":"https://eflight.com/materials/aluminium"}],"relation":"made by"},{"group":"Engines","items":[{"count":8,"name":"Rolls-Royce 250-C47M","note":"650 hp","unit":"of these aircraft","url":"https://eflight.com/engines/rolls-royce-250-c47m"},{"count":2,"name":"Allison (Rolls-Royce) 250 series","note":"250 hp","unit":"of these aircraft","url":"https://eflight.com/engines/allison-rolls-royce-250-series"},{"count":1,"name":"Allison (Rolls-Royce) 250-C47M","note":"650 hp","unit":"of these aircraft","url":"https://eflight.com/engines/allison-rolls-royce-250-c47m"},{"count":1,"name":"Allison (Rolls-Royce) 250-C47","note":"600 hp","unit":"of these aircraft","url":"https://eflight.com/engines/allison-rolls-royce-250-c47"}],"relation":"powered by"},{"group":"Where they are","items":[{"count":4,"name":"Florida","note":"","unit":"of these aircraft","url":"https://eflight.com/states/FL"},{"count":2,"name":"Texas","note":"","unit":"of these aircraft","url":"https://eflight.com/states/TX"},{"count":1,"name":"Oregon","note":"","unit":"of these aircraft","url":"https://eflight.com/states/OR"},{"count":1,"name":"Oklahoma","note":"","unit":"of these aircraft","url":"https://eflight.com/states/OK"},{"count":1,"name":"Delaware","note":"","unit":"of these aircraft","url":"https://eflight.com/states/DE"}],"relation":"registered in"},{"group":"Biggest operators","items":[{"count":2,"name":"Vertol Systems Company INC","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/vertol-systems-company-inc"},{"count":1,"name":"Yavapai County","note":"","unit":"of these aircraft","url":"https://eflight.com/search?q=Yavapai County"},{"count":1,"name":"Wind River Aviation LLC","note":"","unit":"of these aircraft","url":"https://eflight.com/search?q=Wind River Aviation LLC"},{"count":1,"name":"Sharcott INC Trustee","note":"","unit":"of these aircraft","url":"https://eflight.com/search?q=Sharcott INC Trustee"},{"count":1,"name":"Lga 1992 LLC","note":"","unit":"of these aircraft","url":"https://eflight.com/search?q=Lga 1992 LLC"}],"relation":"owned by"},{"group":"Record","items":[{"count":1,"name":"NTSB accidents and incidents involving the 600","note":"0 fatal","unit":"cases since 1982","url":"https://eflight.com/models/md-helicopters-inc/600#accidents"}],"relation":"involved in"},{"group":"Airworthiness","items":[{"count":31,"name":"FAA orders naming the 600","note":"","unit":"airworthiness directives","url":"https://eflight.com/models/md-helicopters-inc/600#airworthiness"},{"count":61,"name":"Approved modifications for the 600","note":"","unit":"supplemental type certificates","url":"https://eflight.com/models/md-helicopters-inc/600#airworthiness"}],"relation":"subject to"},{"group":"Analytics","items":[{"count":null,"name":"Accidents by model, with rates per thousand registered","note":"","unit":"","url":"https://eflight.com/analytics/accidents-by-model"},{"count":null,"name":"The fleet by kind, state and age","note":"","unit":"","url":"https://eflight.com/analytics/fleet"},{"count":null,"name":"Biggest makers and model families","note":"","unit":"","url":"https://eflight.com/analytics/makers"}],"relation":"compared in"}],"graph":"https://eflight.com/graph","graph_index":"https://eflight.com/graph/index.json","license":"https://creativecommons.org/licenses/by/4.0/","node":{"built_of":{"material":"aluminium","name":"aluminium","note":null},"id":"md-helicopters-inc/600","name":"Md Helicopters Inc 600","registered":12,"type":"model","url":"https://eflight.com/models/md-helicopters-inc/600","versions":1},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}