{"as_of":"2026-11-06","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":11,"name":"Md Helicopters Inc MD 900","note":"","unit":"registered","url":"https://eflight.com/models/md-helicopters-inc/md-900#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 99-26-20 L","note":"","unit":"","url":"https://eflight.com/directives/99-26-20 L"},{"count":null,"name":"Replaced by 2002-10-05","note":"","unit":"","url":"https://eflight.com/directives/2002-10-05"}],"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":"2001-05-01","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/380FB83189CE4B4886256A480069C0BA.0001","id":"2001-07-09","kind":"AD","name":"Airworthiness directive 2001-07-09","published":"2001-04-16","subject":"Main Rotor Upper Hub Assembly","system":"rotorcraft","type":"directive","url":"https://eflight.com/directives/2001-07-09"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}