{"as_of":"2026-11-03","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":6,"name":"Saab Ab SAAB 340","note":"","unit":"registered","url":"https://eflight.com/models/saab-ab/saab-340#airworthiness"},{"count":8,"name":"Saab-Fairchild 340","note":"","unit":"registered","url":"https://eflight.com/models/saab-fairchild/340#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Airframe structure","note":"","unit":"","url":"https://eflight.com/systems/structure"}],"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":"1999-10-20","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/275E311D6F39DF8386256A2400473929.0001","id":"99-19-21","kind":"AD","name":"Airworthiness directive 99-19-21","published":"1999-09-15","subject":"Inspect Fastener Holes Of Horizontal Stabilizers","system":"structure","type":"directive","url":"https://eflight.com/directives/99-19-21"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}