{"as_of":"2026-10-30","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":14,"name":"Md Helicopters Inc 500","note":"","unit":"registered","url":"https://eflight.com/models/md-helicopters-inc/500#airworthiness"},{"count":34,"name":"Md Helicopters Llc 369","note":"","unit":"registered","url":"https://eflight.com/models/md-helicopters-llc/369#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":"2026-11-27","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/FR-ADFRAWD-2026-21664-0000000000.0001","id":"2026-21-05","kind":"AD","name":"Airworthiness directive 2026-21-05","published":"2026-10-23","subject":"Engine/transmission coupling","system":"rotorcraft","type":"directive","url":"https://eflight.com/directives/2026-21-05"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}