{"as_of":"2026-11-02","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":83,"name":"Lycoming O-320-H2AD","note":"","unit":"aircraft","url":"https://eflight.com/engines/lycoming-o-320-h2ad#airworthiness"},{"count":27312,"name":"Lycoming O-320 series","note":"","unit":"aircraft","url":"https://eflight.com/engines/lycoming-o-320-series#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":"1978-08-31","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/876C1D4E2FF592808625682B0049C609.0001","id":"77-20-07","kind":"AD","name":"Airworthiness directive 77-20-07","published":"","subject":"Loose Rocker Arm Retaining Studs and Hydraulic Tappets","system":"engine","type":"directive","url":"https://eflight.com/directives/77-20-07"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}