{"abstract":"We are superseding an existing airworthiness directive (AD) for all RR RB211-535E4-37, -535E4-B-37, -535E4-B-75, and -535E4-C-37 turbofan engines. That AD currently requires performing initial and repetitive visual and fluorescent penetrant inspections (FPI) of the low-pressure (LP) turbine stage 1, 2, and 3 discs to detect cracks in the discs. This new AD continues to require those inspections and changes the definition of a shop visit to be less restrictive. This AD was prompted by our finding that the definition of shop visit in the existing AD was too restrictive. We are issuing this AD to revise the definition of shop visit and to detect cracks in the LP turbine stage 1, 2, and 3 discs, which could result in an uncontained release of LP turbine blades and damage to the airplane.","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/2012/01/31/2012-1954.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"77 FR 4648","comment_url":"http://www.regulations.gov/commenton/FAA-2009-0994-0010","comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective March 6, 2012.","disposition_notes":null,"docket_ids":["Docket No. FAA-2009-0994","Directorate Identifier 2009-NE-39-AD","Amendment 39-16934","AD 2012-02-11"],"dockets":[],"document_number":"2012-1954","effective_on":"2012-03-06","end_page":4650,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2012/01/31/2012-1954.xml","html_url":"https://www.federalregister.gov/documents/2012/01/31/2012-1954/airworthiness-directives-rolls-royce-plc-rr-rb211-535-series-turbofan-engine","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2012-1954?publication_date=2012-01-31","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2012-01-31/2012-1954/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":109,"last_updated":"2026-09-22 00:15:09 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2012-01-31/pdf/2012-1954.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2012-01954.pdf?1327931357","publication_date":"2012-01-31","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2012/01/31/2012-1954.txt","regulation_id_number_info":{"2120-AA64":{"issue":"202410","html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=202410&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 - See Attachments","document_id":"FAA-2009-0994-0011"},{"title":"U.S. DOT/FAA - See Attachment","document_id":"FAA-2009-0994-0004"},{"title":"U.S. DOT/FAA - See Attachments","document_id":"FAA-2009-0994-0002"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2009-0994","supporting_documents_count":3,"docket_id":"FAA-2009-0994","regulation_id_number":"2120-AA64","title":"2009-NM-108-AD","checked_regulationsdotgov_at":"2023-03-01T19:16:39Z"},"regulations_dot_gov_url":"http://www.regulations.gov/commenton/FAA-2009-0994-0010","significant":false,"signing_date":null,"start_page":4648,"subtype":null,"title":"Airworthiness Directives; Rolls-Royce plc (RR) RB211-535 Series Turbofan Engine","toc_doc":"Rolls-Royce plc RB211535 Series Turbofan Engine","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":77}