{"as_of":"2026-10-05","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":43,"name":"General Electric CT7-8A","note":"","unit":"aircraft","url":"https://eflight.com/engines/general-electric-ct7-8a#airworthiness"},{"count":69,"name":"General Electric CT7 series","note":"","unit":"aircraft","url":"https://eflight.com/engines/general-electric-ct7-series#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Engine","note":"","unit":"","url":"https://eflight.com/systems/engine"}],"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":"2011-11-17","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/E3ED9ADE7A90D9418625793C004888A8.0001","id":"2011-21-17","kind":"AD","name":"Airworthiness directive 2011-21-17","published":"2011-11-02","subject":"Fuel filter differential pressure switch.","system":"engine","type":"directive","url":"https://eflight.com/directives/2011-21-17"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}