{"as_of":"2026-11-03","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"System","items":[{"count":null,"name":"Propeller","note":"","unit":"","url":"https://eflight.com/systems/propeller"}],"relation":"about"},{"group":"Related orders","items":[{"count":null,"name":"Replaced by 2022-21-13","note":"","unit":"","url":"https://eflight.com/directives/2022-21-13"}],"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":"2022-01-10","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/FR-ADFRAWD-2021-26365-0000000000.0001","id":"2021-23-17","kind":"AD","name":"Airworthiness directive 2021-23-17","published":"2021-12-06","subject":"Propeller Hub Section","system":"propeller","type":"directive","url":"https://eflight.com/directives/2021-23-17"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}