{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":9,"name":"Airbus Helicopters MBB-BK 117 C-1","note":"","unit":"registered","url":"https://eflight.com/models/airbus-helicopters/mbb-bk-117-c-1#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":"2026-04-17","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/FR-ADFRAWD-2026-04921-0000000000.0001","id":"2026-05-04","kind":"AD","name":"Airworthiness directive 2026-05-04","published":"2026-03-13","subject":"Main Rotor Head","system":"rotorcraft","type":"directive","url":"https://eflight.com/directives/2026-05-04"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}