{"as_of":"2026-10-05","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Fitted to","items":[{"count":1,"name":"Aerofab Inc LAKE 250","note":"","unit":"with this engine series","url":"https://eflight.com/models/aerofab-inc/lake-250"},{"count":1,"name":"Aerofab Inc LAKE LA-250","note":"","unit":"with this engine series","url":"https://eflight.com/models/aerofab-inc/lake-la-250"}],"relation":"powers"},{"group":"Where they are","items":[{"count":1,"name":"Wisconsin","note":"","unit":"of these aircraft","url":"https://eflight.com/states/WI"},{"count":1,"name":"Arizona","note":"","unit":"of these aircraft","url":"https://eflight.com/states/AZ"}],"relation":"registered in"},{"group":"Airworthiness","items":[{"count":30,"name":"FAA orders naming the Lycoming TIO-540-AA1AD","note":"","unit":"airworthiness directives","url":"https://eflight.com/engines/lycoming-tio-540-aa1ad#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":2,"horsepower":250,"id":"lycoming-tio-540-aa1ad","maker":"Lycoming","name":"Lycoming TIO-540-AA1AD","thrust_lb":null,"type":"Piston (reciprocating)","url":"https://eflight.com/engines/lycoming-tio-540-aa1ad"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}