{"as_of":"2026-11-06","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":155,"name":"Douglas DC-3","note":"","unit":"registered","url":"https://eflight.com/models/douglas/dc-3#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Propeller","note":"","unit":"","url":"https://eflight.com/systems/propeller"}],"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":"","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/1FEED287953B24C4862569BC0066D520.0001","id":"56-20-05","kind":"AD","name":"Airworthiness directive 56-20-05","published":"","subject":"Propeller Operating Limits","system":"propeller","type":"directive","url":"https://eflight.com/directives/56-20-05"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}