{"as_of":"2026-10-08","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":58,"name":"Bombardier DHC-8 Dash 8 and Q400","note":"","unit":"registered","url":"https://eflight.com/models/bombardier/dhc-8#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Landing gear","note":"","unit":"","url":"https://eflight.com/systems/landing-gear"}],"relation":"about"},{"group":"Related orders","items":[{"count":null,"name":"Replaces 2017-19-09","note":"","unit":"","url":"https://eflight.com/directives/2017-19-09"},{"count":null,"name":"Replaced by 2024-12-05","note":"","unit":"","url":"https://eflight.com/directives/2024-12-05"}],"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":"2022-01-05","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/FR-ADFRAWD-2021-27709-0000000000.0001","id":"2021-25-12","kind":"AD","name":"Airworthiness directive 2021-25-12","published":"2021-12-21","subject":"Landing gear","system":"landing-gear","type":"directive","url":"https://eflight.com/directives/2021-25-12"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}