federal_register: 2011-17648

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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
2011-17648 Airworthiness Directives; Pratt & Whitney Division (PW) PW4000 Series Turbofan Engines Proposed Rule We propose to adopt a new airworthiness directive (AD) for certain PW4000 turbofan engines. This proposed AD was prompted by an updated low-cycle fatigue (LCF) life analysis performed by Pratt & Whitney. This proposed AD would require removing certain part number (P/N) high-pressure turbine (HPT) stage 1 and HPT stage 2 airseals and HPT stage 1 airseal rings before their published life limit, and establishes a new lower life limit for these parts. We are proposing this AD to correct the unsafe condition on these products. 2011-07-14 2011 7 https://www.federalregister.gov/documents/2011/07/14/2011-17648/airworthiness-directives-pratt-and-whitney-division-pw-pw4000-series-turbofan-engines https://www.govinfo.gov/content/pkg/FR-2011-07-14/pdf/2011-17648.pdf Transportation Department; Federal Aviation Administration 492,159 We propose to adopt a new airworthiness directive (AD) for certain PW4000 turbofan engines. This proposed AD was prompted by an updated low-cycle fatigue (LCF) life analysis performed by Pratt & Whitney. This proposed AD would require removing certain...  

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