{"as_of":"2026-11-06","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":396,"name":"Airbus Helicopters EC-135 now H135","note":"","unit":"registered","url":"https://eflight.com/models/airbus-helicopters/ec-135#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Rotorcraft systems","note":"","unit":"","url":"https://eflight.com/systems/rotorcraft"}],"relation":"about"},{"group":"Related orders","items":[{"count":null,"name":"Replaces 2013-21-05","note":"","unit":"","url":"https://eflight.com/directives/2013-21-05"}],"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":"2018-12-21","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/FB552C8134381DC786258347004A281B.0001","id":"2013-21-05R1","kind":"AD","name":"Airworthiness directive 2013-21-05R1","published":"2018-11-16","subject":"Tail Rotor Control System","system":"rotorcraft","type":"directive","url":"https://eflight.com/directives/2013-21-05R1"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}