{"as_of":"2026-11-06","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":1,"name":"Honeywell TPE331-1","note":"","unit":"aircraft","url":"https://eflight.com/engines/honeywell-tpe331-1#airworthiness"},{"count":3,"name":"Honeywell TPE331-2","note":"","unit":"aircraft","url":"https://eflight.com/engines/honeywell-tpe331-2#airworthiness"},{"count":1,"name":"Honeywell TPE331-3U","note":"","unit":"aircraft","url":"https://eflight.com/engines/honeywell-tpe331-3u#airworthiness"},{"count":2,"name":"Honeywell TPE331-5","note":"","unit":"aircraft","url":"https://eflight.com/engines/honeywell-tpe331-5#airworthiness"},{"count":3,"name":"Honeywell TPE331-6","note":"","unit":"aircraft","url":"https://eflight.com/engines/honeywell-tpe331-6#airworthiness"},{"count":27,"name":"Honeywell TPE331-series","note":"","unit":"aircraft","url":"https://eflight.com/engines/honeywell-tpe331-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":"Replaces 90-21-01","note":"","unit":"","url":"https://eflight.com/directives/90-21-01"},{"count":null,"name":"Replaced by 93-05-09","note":"","unit":"","url":"https://eflight.com/directives/93-05-09"}],"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":"","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/7FE3AB2DE04973178625773D00469E64.0001","id":"91-04-02","kind":"Emergency AD","name":"Airworthiness directive 91-04-02","published":"","subject":"Third stage stator assembly","system":"engine","type":"directive","url":"https://eflight.com/directives/91-04-02"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}