federal_register: 2012-29871

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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
2012-29871 Airworthiness Directives; Turbomeca S.A. Turboshaft Engines Proposed Rule We propose to adopt a new airworthiness directive (AD) for certain Turbomeca S.A. Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 turboshaft engines. This proposed AD was prompted by a finding that the engine's tachometer unit cycle counting feature is unreliable. This proposed AD would require daily post-flight checks of the engine tachometer's unit cycle counting feature. This proposed AD would also require ground-run functional checks within every 1,000 operating hours. This proposed AD was prompted by detailed analysis and review of the accuracy of the engine's tachometer cycle counting feature. We are proposing this AD to prevent uncontained engine failure and damage to the helicopter. 2012-12-11 2012 12 https://www.federalregister.gov/documents/2012/12/11/2012-29871/airworthiness-directives-turbomeca-sa-turboshaft-engines https://www.govinfo.gov/content/pkg/FR-2012-12-11/pdf/2012-29871.pdf Transportation Department; Federal Aviation Administration 492,159 We propose to adopt a new airworthiness directive (AD) for certain Turbomeca S.A. Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 turboshaft engines. This proposed AD was prompted by a finding that the engine's tachometer unit cycle...  

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