{"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":"Other and general","note":"","unit":"","url":"https://eflight.com/systems/other"}],"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":"1981-10-02","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/649419E772ABE86F862569A6005CDE8F.0001","id":"81-11-02 R1","kind":"AD","name":"Airworthiness directive 81-11-02 R1","published":"1981-10-01","subject":"Oil Drain Valves","system":"other","type":"directive","url":"https://eflight.com/directives/81-11-02 R1"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}