{"as_of":"2026-11-06","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"System","items":[{"count":null,"name":"Emergency equipment","note":"","unit":"","url":"https://eflight.com/systems/emergency"}],"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":"1985-10-28","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/E3819F130FA79F21862569850066A14E.0001","id":"85-04-01 R1","kind":"AD","name":"Airworthiness directive 85-04-01 R1","published":"","subject":"Hydraulic And Oxygen Line Inspection","system":"emergency","type":"directive","url":"https://eflight.com/directives/85-04-01 R1"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}