federal_register: 2011-726

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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
2011-726 Airworthiness Directives; MD Helicopters, Inc. (MDHI) Model MD900 Helicopters Proposed Rule This document proposes superseding an existing airworthiness directive (AD) for MDHI Model MD900 helicopters. That AD currently requires turning on both Vertical Stabilizer Control System (VSCS) switches and turning off the autopilot (AP/SAS) switch; pulling certain AP/SAS circuit breakers; installing a placard near the AP/SAS master switch; installing an airspeed limitation placard on the instrument panel; and making changes to the Rotorcraft Flight Manual (RFM). This action would retain those requirements and would provide an option of replacing each affected tube adapter with a newly-designed tube adapter, which would provide terminating action for the unsafe condition. This proposal is prompted by the manufacturer introducing an improved, newly-designed tube adapter. The actions specified by this AD are intended to prevent loss of yaw control and subsequent loss of control of the helicopter. 2011-01-14 2011 1 https://www.federalregister.gov/documents/2011/01/14/2011-726/airworthiness-directives-md-helicopters-inc-mdhi-model-md900-helicopters https://www.govinfo.gov/content/pkg/FR-2011-01-14/pdf/2011-726.pdf Transportation Department; Federal Aviation Administration 492,159 This document proposes superseding an existing airworthiness directive (AD) for MDHI Model MD900 helicopters. That AD currently requires turning on both Vertical Stabilizer Control System (VSCS) switches and turning off the autopilot (AP/SAS) switch;... 2120-AA64

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