{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":18633,"name":"Piper PA-28 Cherokee, Warrior, Archer and Arrow","note":"","unit":"registered","url":"https://eflight.com/models/piper/pa-28#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Airframe structure","note":"","unit":"","url":"https://eflight.com/systems/structure"}],"relation":"about"},{"group":"Related orders","items":[{"count":null,"name":"Replaced by 2016-07-21","note":"","unit":"","url":"https://eflight.com/directives/2016-07-21"}],"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":"2015-10-29","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/366D19FEC21352E986257EDE0052AE65.0001","id":"2015-20-13","kind":"AD","name":"Airworthiness directive 2015-20-13","published":"2015-10-14","subject":"Wing Ribs/Bulkhead","system":"structure","type":"directive","url":"https://eflight.com/directives/2015-20-13"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}