{"as_of":"2026-11-02","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"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":"2026-11-12","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/FR-ADFRAWD-2026-21854-0000000000.0001","id":"2026-21-10","kind":"AD","name":"Airworthiness directive 2026-21-10","published":"2026-10-27","subject":"Tail rotor gearbox","system":"rotorcraft","type":"directive","url":"https://eflight.com/directives/2026-21-10"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}