{"as_of":"2026-10-05","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":3,"name":"Pratt & Whitney Canada PT6B-36A","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-canada-pt6b-36a#airworthiness"},{"count":4,"name":"Pratt & Whitney Canada PT6B-36B","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-canada-pt6b-36b#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Engine","note":"","unit":"","url":"https://eflight.com/systems/engine"}],"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":"2004-10-18","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/6CA3FC8130A69BD986256F2000526FD4.0001","id":"2004-20-04","kind":"AD","name":"Airworthiness directive 2004-20-04","published":"2004-10-01","subject":"Compressor rear hubs","system":"engine","type":"directive","url":"https://eflight.com/directives/2004-20-04"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}