{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":477,"name":"Bell 47","note":"","unit":"registered","url":"https://eflight.com/models/bell/47#airworthiness"},{"count":53,"name":"Brantly B-2","note":"","unit":"registered","url":"https://eflight.com/models/brantly/b-2#airworthiness"},{"count":61,"name":"Enstrom Helicopter Corp 280","note":"","unit":"registered","url":"https://eflight.com/models/enstrom-helicopter-corp/280#airworthiness"},{"count":147,"name":"Enstrom F-28","note":"","unit":"registered","url":"https://eflight.com/models/enstrom/f-28#airworthiness"},{"count":217,"name":"Hiller UH-12","note":"","unit":"registered","url":"https://eflight.com/models/hiller/uh-12#airworthiness"},{"count":207,"name":"Hughes 269 300 series helicopters","note":"","unit":"registered","url":"https://eflight.com/models/hughes/269#airworthiness"},{"count":817,"name":"Robinson R22","note":"","unit":"registered","url":"https://eflight.com/models/robinson/r22#airworthiness"},{"count":212,"name":"Schweizer 269 300 series helicopters","note":"","unit":"registered","url":"https://eflight.com/models/schweizer/269#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Other and general","note":"","unit":"","url":"https://eflight.com/systems/other"}],"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":"1981-08-13","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/1E1EA000109B8BAF86256A3400618CE5.0001","id":"81-17-01","kind":"AD","name":"Airworthiness directive 81-17-01","published":"","subject":"Starting Vibrator Assemblies","system":"other","type":"directive","url":"https://eflight.com/directives/81-17-01"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}
