{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":6,"name":"Billings Flying Service Inc CH-47","note":"","unit":"registered","url":"https://eflight.com/models/billings-flying-service-inc/ch-47#airworthiness"},{"count":5,"name":"Tandem Rotor Llc CH47","note":"","unit":"registered","url":"https://eflight.com/models/tandem-rotor-llc/ch47#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Rotorcraft systems","note":"","unit":"","url":"https://eflight.com/systems/rotorcraft"}],"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":"2018-09-17","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/DF916A7DED71BB7C862582E9004680CA.0001","id":"2018-16-11","kind":"AD","name":"Airworthiness directive 2018-16-11","published":"2018-08-13","subject":"Main Rotor Head","system":"rotorcraft","type":"directive","url":"https://eflight.com/directives/2018-16-11"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}