{"as_of":"2026-10-30","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"System","items":[{"count":null,"name":"Engine","note":"","unit":"","url":"https://eflight.com/systems/engine"}],"relation":"about"},{"group":"Related orders","items":[{"count":null,"name":"Replaces 54-22-02","note":"","unit":"","url":"https://eflight.com/directives/54-22-02"},{"count":null,"name":"Replaces 56-23-2","note":"","unit":"","url":"https://eflight.com/directives/56-23-2"}],"relation":"related to"},{"group":"More","items":[{"count":null,"name":"Every FAA order","note":"","unit":"","url":"https://eflight.com/directives"},{"count":null,"name":"Every aircraft system","note":"","unit":"","url":"https://eflight.com/systems"}],"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":{"effective":"","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID105122107220240410153434.0001","id":"56-26-03","kind":"AD","name":"Airworthiness directive 56-26-03","published":"1957-04-11","subject":"Crankshaft","system":"engine","type":"directive","url":"https://eflight.com/directives/56-26-03"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}