federal_register: 2022-08304

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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
2022-08304 Airworthiness Directives; Leonardo S.p.a. Helicopters Proposed Rule The FAA proposes to supersede Airworthiness Directive (AD) 2021-20-10, which applies to certain Leonardo S.p.a. Model AB139 and AW139 helicopters. AD 2021-20-10 requires removing from service a certain part-numbered main gearbox (MGB) spherical bearing lock nut (lock nut) that is installed on certain part-numbered MGBs and replacing it with a newly designed MGB lock nut. AD 2021-20-10 also prohibits installing any MGB with the affected MGB lock nut and prohibits installing any affected MGB lock nut on any helicopter. Since the FAA issued AD 2021-20-10, it was discovered that a part number (P/ N) was incorrectly listed and that the applicability needed to be clarified. This proposed AD would retain the requirements of AD 2021- 20-10 and would clarify the applicability. The FAA is proposing this AD to address the unsafe condition on these products. 2022-04-20 2022 4 https://www.federalregister.gov/documents/2022/04/20/2022-08304/airworthiness-directives-leonardo-spa-helicopters https://www.govinfo.gov/content/pkg/FR-2022-04-20/pdf/2022-08304.pdf Transportation Department; Federal Aviation Administration 492,159 The FAA proposes to supersede Airworthiness Directive (AD) 2021-20-10, which applies to certain Leonardo S.p.a. Model AB139 and AW139 helicopters. AD 2021-20-10 requires removing from service a certain part-numbered main gearbox (MGB) spherical bearing... 2120-AA64

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