{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":14,"name":"Pratt & Whitney Canada PW123","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-canada-pw123#airworthiness"},{"count":10,"name":"Pratt & Whitney Canada PW123AF","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-canada-pw123af#airworthiness"},{"count":3,"name":"Pratt & Whitney Canada PW123C","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-canada-pw123c#airworthiness"},{"count":15,"name":"Pratt & Whitney Canada PW123D","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-canada-pw123d#airworthiness"},{"count":5,"name":"Pratt & Whitney Canada PW123E","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-canada-pw123e#airworthiness"},{"count":1,"name":"Pratt & Whitney Canada PW127E","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-canada-pw127e#airworthiness"},{"count":2,"name":"Pratt & Whitney Canada PW127F","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-canada-pw127f#airworthiness"},{"count":2,"name":"Pratt & Whitney Canada PW127G","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-canada-pw127g#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":"2004-11-05","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/1905417F5455666986256F2000526F87.0001","id":"2004-20-01","kind":"AD","name":"Airworthiness directive 2004-20-01","published":"2004-10-01","subject":"Bypass valve cover","system":"engine","type":"directive","url":"https://eflight.com/directives/2004-20-01"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}