{"as_of":"2026-11-02","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Applies to","items":[{"count":1,"name":"Pratt & Whitney PW4052","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-pw4052#airworthiness"},{"count":25,"name":"Pratt & Whitney PW4056","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-pw4056#airworthiness"},{"count":14,"name":"Pratt & Whitney PW4060","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-pw4060#airworthiness"},{"count":6,"name":"Pratt & Whitney PW4062","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-pw4062#airworthiness"},{"count":65,"name":"Pratt & Whitney PW4158","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-pw4158#airworthiness"},{"count":10,"name":"Pratt & Whitney PW4460","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-pw4460#airworthiness"},{"count":8,"name":"Pratt & Whitney PW4462","note":"","unit":"aircraft","url":"https://eflight.com/engines/pratt-whitney-pw4462#airworthiness"}],"relation":"applies to"},{"group":"System","items":[{"count":null,"name":"Engine","note":"","unit":"","url":"https://eflight.com/systems/engine"}],"relation":"about"},{"group":"Related orders","items":[{"count":null,"name":"Replaced by 2001-09-07","note":"","unit":"","url":"https://eflight.com/directives/2001-09-07"}],"relation":"related to"},{"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":"","faa_document":"https://drs.faa.gov/browse/excelExternalWindow/3F87E5B2A5B09F0686256CD200785DC2.0001","id":"2001-08-52","kind":"Emergency AD","name":"Airworthiness directive 2001-08-52","published":"","subject":"Multiple-engine power loss due to HPC surges","system":"engine","type":"directive","url":"https://eflight.com/directives/2001-08-52"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}