{"abstract":"The FAA is adopting a new airworthiness directive (AD) for certain Pratt & Whitney RTX Corporation (PW) Model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 engines. This AD was prompted by an analysis of an event involving an International Aero Engines, LLC (IAE LLC) Model PW1127GA-JM engine, which experienced a high-pressure compressor (HPC) 7th-stage integrally bladed rotor (IBR- 7) separation that resulted in an aborted takeoff. This AD requires repetitive angle ultrasonic scan inspections (AUSIs) of the HPC 15th- stage disks, front turbine hubs, high pressure turbine (HPT) 1st-stage air seals, and HPT 2nd-stage hubs for crack indications, and removal from service and replacement if necessary, and for certain serial numbers, removal from service and replacement of the HPT 1st-stage air seal. The FAA is issuing this AD to address the unsafe condition on these products.","action":"Final rule.","agencies":[{"raw_name":"DEPARTMENT OF TRANSPORTATION","name":"Transportation Department","id":492,"url":"https://www.federalregister.gov/agencies/transportation-department","json_url":"https://www.federalregister.gov/api/v1/agencies/492","parent_id":null,"slug":"transportation-department"},{"raw_name":"Federal Aviation Administration","name":"Federal Aviation Administration","id":159,"url":"https://www.federalregister.gov/agencies/federal-aviation-administration","json_url":"https://www.federalregister.gov/api/v1/agencies/159","parent_id":492,"slug":"federal-aviation-administration"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2026/05/22/2026-10360.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"91 FR 30191","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective June 26, 2026.","disposition_notes":null,"docket_ids":["Docket No. FAA-2025-0923","Project Identifier AD-2024-00529-E","Amendment 39-23322","AD 2026-09-02"],"dockets":[{"supporting_documents":[],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2026-05-22","updated_at":"2026-05-22T09:59:25.294-04:00","comment_url":"https://www.regulations.gov/commenton/FAA-2025-0923-0008","allow_late_comments":false,"id":"FAA-2025-0923-0008","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":0,"id":"FAA-2025-0923","title":"AD-2024-00529-E; Pratt & Whitney Division Engines; Angled Ultrasonic Scan (AUSI) and removal of select impacted Nickel Powder Components"}],"document_number":"2026-10360","effective_on":"2026-06-26","end_page":30196,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/05/22/2026-10360.xml","html_url":"https://www.federalregister.gov/documents/2026/05/22/2026-10360/airworthiness-directives-pratt-and-whitney-rtx-corporation-type-certificate-previously-held-by-pratt","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-10360?publication_date=2026-05-22","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-05-22/2026-10360/mods.xml","not_received_for_publication":null,"page_length":6,"page_views":{"count":109,"last_updated":"2026-05-25 12:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-05-22/pdf/2026-10360.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-10360.pdf?1779367520","publication_date":"2026-05-22","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/05/22/2026-10360.txt","regulation_id_number_info":{"2120-AA64":{"issue":"202504","html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=202504&RIN=2120-AA64&operation=OPERATION_EXPORT_XML","priority_category":"Routine and Frequent"}},"regulation_id_numbers":["2120-AA64"],"regulations_dot_gov_info":{"supporting_documents":[],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_count":0,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2025-0923","supporting_documents_count":0,"docket_id":"FAA-2025-0923","document_id":"FAA-2025-0923-0008","regulation_id_number":"2120-AA64","title":"AD-2024-00529-E; Pratt & Whitney Division Engines; Angled Ultrasonic Scan (AUSI) and removal of select impacted Nickel Powder Components","checked_regulationsdotgov_at":"2026-05-22T18:55:04Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":30191,"subtype":null,"title":"Airworthiness Directives; Pratt & Whitney RTX Corporation (Type Certificate Previously Held by Pratt & Whitney Division United Technologies Corporation) Engines","toc_doc":"Pratt and Whitney RTX Corporation (Type Certificate Previously Held by Pratt and Whitney Division United Technologies Corporation) Engines","toc_subject":"Airworthiness Directives","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":91}