{"as_of":"2026-10-05","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Fitted to","items":[{"count":31,"name":"Daher (Socata) TB-20","note":"","unit":"with this engine series","url":"https://eflight.com/models/daher-socata/tb-20"}],"relation":"powers"},{"group":"Where they are","items":[{"count":4,"name":"Delaware","note":"","unit":"of these aircraft","url":"https://eflight.com/states/DE"},{"count":4,"name":"California","note":"","unit":"of these aircraft","url":"https://eflight.com/states/CA"},{"count":3,"name":"Oklahoma","note":"","unit":"of these aircraft","url":"https://eflight.com/states/OK"},{"count":3,"name":"New Mexico","note":"","unit":"of these aircraft","url":"https://eflight.com/states/NM"},{"count":3,"name":"Florida","note":"","unit":"of these aircraft","url":"https://eflight.com/states/FL"}],"relation":"registered in"},{"group":"Biggest operators","items":[{"count":3,"name":"Sky West Aviation INC Trustee","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/sky-west-aviation-inc-trustee"},{"count":2,"name":"Southern Aircraft Consultancy INC Trustee","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/southern-aircraft-consultancy-inc-trustee"},{"count":2,"name":"Aircraft Guaranty CORP Trustee","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/aircraft-guaranty-corp-trustee"}],"relation":"owned by"},{"group":"Airworthiness","items":[{"count":32,"name":"FAA orders naming the Lycoming IO-540-C4D5D","note":"","unit":"airworthiness directives","url":"https://eflight.com/engines/lycoming-io-540-c4d5d#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":31,"horsepower":250,"id":"lycoming-io-540-c4d5d","maker":"Lycoming","name":"Lycoming IO-540-C4D5D","thrust_lb":null,"type":"Piston (reciprocating)","url":"https://eflight.com/engines/lycoming-io-540-c4d5d"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}