{"as_of":"2026-11-06","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"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":"Electrical power","note":"","unit":"","url":"https://eflight.com/systems/electrical"}],"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":"1990-11-14","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/70BA17FE272FB30F86256A1F00513B80.0001","id":"90-21-16","kind":"AD","name":"Airworthiness directive 90-21-16","published":"","subject":"Electrical Control Units","system":"electrical","type":"directive","url":"https://eflight.com/directives/90-21-16"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}