{"as_of":"2026-11-06","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":8,"name":"Agusta Spa AB139","note":"","unit":"registered","url":"https://eflight.com/models/agusta-spa/ab139#airworthiness"},{"count":13,"name":"Leonardo Spa AW139","note":"","unit":"registered","url":"https://eflight.com/models/leonardo-spa/aw139#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Rotorcraft systems","note":"","unit":"","url":"https://eflight.com/systems/rotorcraft"}],"relation":"about"},{"group":"Related orders","items":[{"count":null,"name":"Replaces 2017-23-08","note":"","unit":"","url":"https://eflight.com/directives/2017-23-08"}],"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":"2021-05-07","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/75CC66EFB15E2F81862586AB0053C6D9.0001","id":"2021-05-21","kind":"AD","name":"Airworthiness directive 2021-05-21","published":"2021-04-02","subject":"Main Rotor System","system":"rotorcraft","type":"directive","url":"https://eflight.com/directives/2021-05-21"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}