{"as_of":"2026-11-05","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":358,"name":"Boeing 777","note":"","unit":"registered","url":"https://eflight.com/models/boeing/777#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 99-25-13","note":"","unit":"","url":"https://eflight.com/directives/99-25-13"},{"count":null,"name":"Replaced by 2000-13-04","note":"","unit":"","url":"https://eflight.com/directives/2000-13-04"}],"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":"1999-12-23","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/496D2520357B4BFE86256CBC0051C6CE.0001","id":"99-25-13 C1","kind":"AD","name":"Airworthiness directive 99-25-13 C1","published":"1999-12-22","subject":"Limitations Section - AFM - Backup Generator Having Sheared Shaft","system":"engine","type":"directive","url":"https://eflight.com/directives/99-25-13 C1"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}