{"abstract":"The FAA proposes to adopt a new airworthiness directive (AD) for certain Pratt & Whitney (PW) Model PW1519G, PW1521G, PW1521GA, PW1521G-3, PW1524G, PW1524G-3, PW1525G, PW1525G-3, PW1919G, PW1921G, PW1922G, PW1923G, and PW1923G-A engines. This proposed AD was prompted by an updated 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 engine shutdown and aborted takeoff. This proposed AD would require performing an angled ultrasonic inspection (AUSI) of certain high-pressure turbine (HPT) 1st-stage hubs, HPT 2nd-stage hubs, and HPC 8th-stage disks for cracks and, depending on the results of the inspections, replacing the HPT 1st- stage hubs, HPT 2nd-stage hubs, or HPC 8th-stage disks. This proposed AD would also require accelerated replacement of certain HPC 7th-stage rotors, HPC 8th-stage disks, HPC rear hubs, HPT 1st-stage hubs, HPT 2nd-stage hubs, HPT 1st-stage air seals, HPT 2nd-stage air seals, HPT 1st-stage blade retaining plates, and HPT 2nd-stage blade retaining plates. The FAA is proposing this AD to address the unsafe condition on these products.","action":"Notice of proposed rulemaking (NPRM).","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/2024/01/09/2024-00309.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"89 FR 1038","comment_url":null,"comments_close_on":"2024-02-08","correction_of":null,"corrections":[],"dates":"The FAA must receive comments on this proposed AD by February 8, 2024.","disposition_notes":null,"docket_ids":["Docket No. FAA-2023-2523","Project Identifier AD-2023-01086-E"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2023-2523-0007"}],"agency_name":"FAA","documents":[{"comment_count":4,"comment_start_date":"2024-01-09","updated_at":"2024-02-09T00:01:41.030-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2023-2523-0001","allow_late_comments":null,"id":"FAA-2023-2523-0001","comment_end_date":"2024-02-09","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":1,"id":"FAA-2023-2523","title":"AD-2023-1086-E; Pratt & Whitney Model PW1500G and PW1900G series engines; turbine and compressor component - inspection / removal."}],"document_number":"2024-00309","effective_on":null,"end_page":1042,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2024/01/09/2024-00309.xml","html_url":"https://www.federalregister.gov/documents/2024/01/09/2024-00309/airworthiness-directives-pratt-and-whitney-turbofan-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2024-00309?publication_date=2024-01-09","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2024-01-09/2024-00309/mods.xml","not_received_for_publication":null,"page_length":5,"page_views":{"count":854,"last_updated":"2026-10-23 02:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2024-01-09/pdf/2024-00309.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2024-00309.pdf?1704489314","publication_date":"2024-01-09","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2024/01/09/2024-00309.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":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2023-2523-0007"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_count":4,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2023-2523","supporting_documents_count":1,"docket_id":"FAA-2023-2523","document_id":"FAA-2023-2523-0001","regulation_id_number":"2120-AA64","title":"AD-2023-1086-E; Pratt & Whitney Model PW1500G and PW1900G series engines; turbine and compressor component - inspection / removal.","checked_regulationsdotgov_at":"2024-02-10T02:00:17Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":1038,"subtype":null,"title":"Airworthiness Directives; Pratt & Whitney Turbofan Engines","toc_doc":"Pratt and Whitney Turbofan Engines","toc_subject":"Airworthiness Directives:\n","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Proposed Rule","volume":89}