{"as_of":"2026-10-05","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Fitted to","items":[{"count":1,"name":"Hughes 369 500 series helicopters","note":"","unit":"with this engine series","url":"https://eflight.com/models/hughes/369"}],"relation":"powers"},{"group":"Where they are","items":[{"count":1,"name":"Wyoming","note":"","unit":"of these aircraft","url":"https://eflight.com/states/WY"}],"relation":"registered in"},{"group":"Biggest operators","items":[{"count":1,"name":"Southern Aircraft Consultancy INC Trustee","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/southern-aircraft-consultancy-inc-trustee"}],"relation":"owned by"},{"group":"Airworthiness","items":[{"count":15,"name":"FAA orders naming the Rolls-Royce 250-C18","note":"","unit":"airworthiness directives","url":"https://eflight.com/engines/rolls-royce-250-c18#airworthiness"}],"relation":"subject to"},{"group":"Analytics","items":[{"count":null,"name":"The fleet by engine type","note":"","unit":"","url":"https://eflight.com/analytics/fleet"},{"count":null,"name":"Every engine series","note":"","unit":"","url":"https://eflight.com/engines"}],"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":{"aircraft":1,"horsepower":317,"id":"rolls-royce-250-c18","maker":"Rolls-Royce","name":"Rolls-Royce 250-C18","thrust_lb":null,"type":"Turboshaft","url":"https://eflight.com/engines/rolls-royce-250-c18"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}