{"as_of":"2026-10-05","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Where they are","items":[{"count":3,"name":"Alaska","note":"","unit":"of these aircraft","url":"https://eflight.com/states/AK"},{"count":2,"name":"Texas","note":"","unit":"of these aircraft","url":"https://eflight.com/states/TX"},{"count":1,"name":"New York","note":"","unit":"of these aircraft","url":"https://eflight.com/states/NY"},{"count":1,"name":"Michigan","note":"","unit":"of these aircraft","url":"https://eflight.com/states/MI"}],"relation":"registered in"},{"group":"Airworthiness","items":[{"count":19,"name":"FAA orders naming the Lycoming O-540-A4D5","note":"","unit":"airworthiness directives","url":"https://eflight.com/engines/lycoming-o-540-a4d5#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":7,"horsepower":250,"id":"lycoming-o-540-a4d5","maker":"Lycoming","name":"Lycoming O-540-A4D5","thrust_lb":null,"type":"Piston (reciprocating)","url":"https://eflight.com/engines/lycoming-o-540-a4d5"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}