{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"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 2007-24-05","note":"","unit":"","url":"https://eflight.com/directives/2007-24-05"}],"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":"1999-04-20","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/FD5A01BC72B651198625686300515404.0001","id":"99-02-51","kind":"AD","name":"Airworthiness directive 99-02-51","published":"1999-04-05","subject":"Starter Shaft Seal","system":"engine","type":"directive","url":"https://eflight.com/directives/99-02-51"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}