{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Covers","items":[{"count":3,"name":"Lycoming VO-540-B1B3","note":"","unit":"aircraft","url":"https://eflight.com/engines/lycoming-vo-540-b1b3"},{"count":110,"name":"Lycoming VO-540 series","note":"","unit":"aircraft","url":"https://eflight.com/engines/lycoming-vo-540-series"}],"relation":"covers"},{"group":"Held by","items":[{"count":null,"name":"Lycoming Engines","note":"","unit":"","url":"https://eflight.com/holders/lycoming-engines"}],"relation":"held by"},{"group":"Orders","items":[{"count":13,"name":"FAA orders on these designs","note":"","unit":"airworthiness directives","url":"https://eflight.com/certificates/E-304"},{"count":null,"name":"2026-04-11: Engine (Reciprocating)","note":"2026-04-08","unit":"","url":"https://eflight.com/directives/2026-04-11"},{"count":null,"name":"2024-21-02: Engine (Reciprocating)","note":"2024-12-05","unit":"","url":"https://eflight.com/directives/2024-21-02"},{"count":null,"name":"2022-16-03: Engine (RECIPROCATING)","note":"2022-08-15","unit":"","url":"https://eflight.com/directives/2022-16-03"},{"count":null,"name":"2012-03-07: Carburetor","note":"2012-03-27","unit":"","url":"https://eflight.com/directives/2012-03-07"}],"relation":"subject to"},{"group":"More","items":[{"count":null,"name":"Every type certificate","note":"","unit":"","url":"https://eflight.com/certificates"},{"count":null,"name":"Who holds what","note":"","unit":"","url":"https://eflight.com/holders"}],"relation":"see also"}],"graph":"https://eflight.com/graph","graph_index":"https://eflight.com/graph/index.json","license":"https://creativecommons.org/licenses/by/4.0/","node":{"faa_document":"https://drs.faa.gov/browse/excelExternalWindow/CB06D788587A78A38625780E005D1D88.0001","holder":"Lycoming Engines","id":"E-304","models":["VO-540-B2G","VO-540-B2A","VO-540-B2D","VO-540-B1B3","VO-540-B1D","VO-540-B1C","VO-540-B1A","VO-540-A2A","VO-540-B1B","VO-540-B2E","VO-540-B1E","VO-540-B1H3","VO-540-C1A","VO-540-B2C","VO-540-B1F","VO-540-C2A (O-540-9)","VO-540-C2C","VO-540-C1C3","VO-540-A1A","VO-540-C2B","VO-540-C1B"],"name":"Type certificate E-304","product_type":"Engine","type":"certificate","url":"https://eflight.com/certificates/E-304"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}