{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":1,"name":"Rolls-Royce SPEY 506-14","note":"","unit":"aircraft","url":"https://eflight.com/engines/rolls-royce-spey-506-14#airworthiness"},{"count":15,"name":"Rolls-Royce SPEY 511-8","note":"","unit":"aircraft","url":"https://eflight.com/engines/rolls-royce-spey-511-8#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":"1995-01-06","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/339181CEFEB6D3558625688000663ED3.0001","id":"94-23-09","kind":"AD","name":"Airworthiness directive 94-23-09","published":"1994-12-07","subject":"High Pressure Compressor Disks","system":"engine","type":"directive","url":"https://eflight.com/directives/94-23-09"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}