{"as_of":"2026-10-29","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":17,"name":"Mitsubishi MU-300","note":"","unit":"registered","url":"https://eflight.com/models/mitsubishi/mu-300#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Heating, ice protection and utility systems","note":"","unit":"","url":"https://eflight.com/systems/utility"}],"relation":"about"},{"group":"Related orders","items":[{"count":null,"name":"Replaces 94-25-10","note":"","unit":"","url":"https://eflight.com/directives/94-25-10"}],"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":"1999-11-22","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/ABFF192FEE02634786256A090072E103.0001","id":"99-21-26","kind":"AD","name":"Airworthiness directive 99-21-26","published":"1999-10-18","subject":"Airplane Flight Manual Changes - Icing Conditions","system":"utility","type":"directive","url":"https://eflight.com/directives/99-21-26"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}