federal_register: E9-29482

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document_number title type abstract publication_date pub_year pub_month html_url pdf_url agency_names agency_ids excerpts regulation_id_numbers
E9-29482 Airworthiness Directives; Honeywell International Inc. TFE731 Series Turbofan Engines Proposed Rule This supplemental NPRM revises an earlier proposed airworthiness directive (AD), for Honeywell International Inc. TFE731 series turbofan engines with certain second stage low-pressure compressor rotor (LPCR) discs and/or certain third stage LPCR discs installed. That proposed AD would have required removing from service certain second stage LPCR discs and/or certain third stage LPCR discs. That proposed AD resulted from a report of cracks found during a fluorescent penetrant inspection (FPI) of the disc bore. This supplemental NPRM revises the proposed AD to correct a P/N error, to clarify the applicability, and to clarify the instructions in the compliance section. This supplemental proposed AD results from a report of cracks found during an FPI of the disc bore. We are proposing this supplemental proposed AD to prevent an uncontained failure of a second stage LPCR disc and or a third stage LPCR disc due to cracks in the bore, which could result in damage to the airplane. 2009-12-11 2009 12 https://www.federalregister.gov/documents/2009/12/11/E9-29482/airworthiness-directives-honeywell-international-inc-tfe731-series-turbofan-engines https://www.govinfo.gov/content/pkg/FR-2009-12-11/pdf/E9-29482.pdf Transportation Department; Federal Aviation Administration 492,159 This supplemental NPRM revises an earlier proposed airworthiness directive (AD), for Honeywell International Inc. TFE731 series turbofan engines with certain second stage low-pressure compressor rotor (LPCR) discs and/or certain third stage LPCR discs...  

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