federal_register: 2012-12399

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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
2012-12399 Airworthiness Directives; Bell Helicopter Textron Canada Limited Helicopters Rule We are adopting a new airworthiness directive (AD) for Bell Helicopter Textron Canada Limited (BHTC) Model 427 helicopters which requires replacing certain tailboom attachment hardware and at certain intervals thereafter, determining the torque of that tailboom attachment hardware. This AD was prompted by a review of the tailboom attachment installation, which revealed that the torque value of the bolts specified in the BHTC Model 427 Maintenance Manual and applied during manufacturing was incorrect and exceeded the torque range recommended for the bolts. The actions are intended to prevent an over- torque of the tailboom attachment bolt (bolt), bolt failure, loss of the tailboom, and subsequent loss of control of the helicopter. 2012-05-25 2012 5 https://www.federalregister.gov/documents/2012/05/25/2012-12399/airworthiness-directives-bell-helicopter-textron-canada-limited-helicopters https://www.govinfo.gov/content/pkg/FR-2012-05-25/pdf/2012-12399.pdf Transportation Department; Federal Aviation Administration 492,159 We are adopting a new airworthiness directive (AD) for Bell Helicopter Textron Canada Limited (BHTC) Model 427 helicopters which requires replacing certain tailboom attachment hardware and at certain intervals thereafter, determining the torque of that...  

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