{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":122,"name":"Hughes 369 500 series helicopters","note":"","unit":"registered","url":"https://eflight.com/models/hughes/369#airworthiness"},{"count":108,"name":"Md Helicopters Inc 369","note":"","unit":"registered","url":"https://eflight.com/models/md-helicopters-inc/369#airworthiness"},{"count":15,"name":"Md Helicopters Inc 500","note":"","unit":"registered","url":"https://eflight.com/models/md-helicopters-inc/500#airworthiness"},{"count":11,"name":"Md Helicopters Inc 600","note":"","unit":"registered","url":"https://eflight.com/models/md-helicopters-inc/600#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Rotorcraft systems","note":"","unit":"","url":"https://eflight.com/systems/rotorcraft"}],"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":"2020-10-28","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/D8845BAE3B58FAB5862585EC004434C2.0001","id":"2020-18-20","kind":"AD","name":"Airworthiness directive 2020-18-20","published":"2020-09-23","subject":"Main Rotor Blade","system":"rotorcraft","type":"directive","url":"https://eflight.com/directives/2020-18-20"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}