{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":13,"name":"Pratt & Whitney JT9D series","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-jt9d-series#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Engine","note":"","unit":"","url":"https://eflight.com/systems/engine"}],"relation":"about"},{"group":"Related orders","items":[{"count":null,"name":"Replaced by 2009-10-01","note":"","unit":"","url":"https://eflight.com/directives/2009-10-01"}],"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":"2007-09-28","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/2452CBB82248867186257341004B0064.0001","id":"2007-17-21","kind":"AD","name":"Airworthiness directive 2007-17-21","published":"2007-08-24","subject":"High pressure turbine (HPT) vane assemblies","system":"engine","type":"directive","url":"https://eflight.com/directives/2007-17-21"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}