{"as_of":"2026-10-05","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Fitted to","items":[{"count":2,"name":"Piper PA-24 Comanche","note":"","unit":"with this engine series","url":"https://eflight.com/models/piper/pa-24"},{"count":2,"name":"Beechcraft 65","note":"","unit":"with this engine series","url":"https://eflight.com/models/beechcraft/65"},{"count":1,"name":"Piper PA-36 Pawnee Brave","note":"","unit":"with this engine series","url":"https://eflight.com/models/piper/pa-36"}],"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":"South Dakota","note":"","unit":"of these aircraft","url":"https://eflight.com/states/SD"},{"count":1,"name":"Nevada","note":"","unit":"of these aircraft","url":"https://eflight.com/states/NV"},{"count":1,"name":"New Hampshire","note":"","unit":"of these aircraft","url":"https://eflight.com/states/NH"},{"count":1,"name":"Mississippi","note":"","unit":"of these aircraft","url":"https://eflight.com/states/MS"}],"relation":"registered in"},{"group":"Airworthiness","items":[{"count":22,"name":"FAA orders naming the Lycoming IO-720-A1B","note":"","unit":"airworthiness directives","url":"https://eflight.com/engines/lycoming-io-720-a1b#airworthiness"},{"count":50,"name":"Failure reports on the Lycoming IO-720-A1B","note":"","unit":"reports since 1995","url":"https://eflight.com/engines/lycoming-io-720-a1b#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":8,"horsepower":400,"id":"lycoming-io-720-a1b","maker":"Lycoming","name":"Lycoming IO-720-A1B","thrust_lb":null,"type":"Piston (reciprocating)","url":"https://eflight.com/engines/lycoming-io-720-a1b"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}