{"as_of":"2026-10-09","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":20670,"name":"Cessna 172 Skyhawk","note":"","unit":"registered","url":"https://eflight.com/models/cessna/172#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Airframe structure","note":"","unit":"","url":"https://eflight.com/systems/structure"}],"relation":"about"},{"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":"1974-02-12","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/8560DC9CF2D3E59D86256A3400649047.0001","id":"74-04-01","kind":"AD","name":"Airworthiness directive 74-04-01","published":"","subject":"Aft Fuselage Bulkhead Assembly","system":"structure","type":"directive","url":"https://eflight.com/directives/74-04-01"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}