{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":61,"name":"Enstrom Helicopter Corp 280","note":"","unit":"registered","url":"https://eflight.com/models/enstrom-helicopter-corp/280#airworthiness"},{"count":73,"name":"Enstrom Helicopter Corp 480","note":"","unit":"registered","url":"https://eflight.com/models/enstrom-helicopter-corp/480#airworthiness"},{"count":147,"name":"Enstrom F-28","note":"","unit":"registered","url":"https://eflight.com/models/enstrom/f-28#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Rotorcraft systems","note":"","unit":"","url":"https://eflight.com/systems/rotorcraft"}],"relation":"about"},{"group":"Related orders","items":[{"count":null,"name":"Replaced by 2018-02-01","note":"","unit":"","url":"https://eflight.com/directives/2018-02-01"}],"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":"","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/F5030410D75DEFEF86257E23006A16C9.0001","id":"2015-08-51","kind":"Emergency AD","name":"Airworthiness directive 2015-08-51","published":"","subject":"Main Rotor Head","system":"rotorcraft","type":"directive","url":"https://eflight.com/directives/2015-08-51"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}