{"as_of":"2026-11-06","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":192,"name":"Boeing 747","note":"","unit":"registered","url":"https://eflight.com/models/boeing/747#airworthiness"}],"relation":"applies to"},{"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 2000-23-25","note":"","unit":"","url":"https://eflight.com/directives/2000-23-25"},{"count":null,"name":"Replaced by 2002-05-01","note":"","unit":"","url":"https://eflight.com/directives/2002-05-01"}],"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":"2001-07-27","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/86F4C73E09E0F8E286256A73006D6C27.0001","id":"2001-12-23","kind":"AD","name":"Airworthiness directive 2001-12-23","published":"2001-06-22","subject":"Vertical Chords of the Aft Torque Bulkhead of the Outboard Nacelle Struts","system":"engine","type":"directive","url":"https://eflight.com/directives/2001-12-23"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}