United States Government Publishing Office publisher pbl distributor dst United States National Archives and Records Administration Office of the Federal Register author aut Government Organization text government publication eng FR Regulatory Information 2011_register executive 2011-10-27 article Rules and Regulations D09002ee1c7ff1db4 D09002ee1c7ff1e2e United States Department of Transportation originator org United States Government Agency or Subagency United States Federal Aviation Administration originator org United States Government Agency or Subagency This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 2011-15-51, which was sent previously to all known U.S. owners and operators of the specified Bell Model 407 and 427 helicopters by individual letters. This AD requires inspecting certain hydraulic servo actuators to determine whether the shaft turns independently of the nut or the clevis assembly. If the shaft turns independently, this AD requires replacing the servo with an airworthy servo. If the shaft does not turn independently, the AD requires inspecting to determine the condition of the lock washers. Based on the condition of the lock washers, the AD requires either replacing the servo with an airworthy servo, or if any tab of the lock washer is not flush against a flat surface of the nut or clevis assembly, bending it flush against a flat surface. The AD also requires reidentifying the servo by metal-impression stamping or by vibro- etching "67.01" onto the modification plate. Also, the AD requires before installing a servo with a part number or serial number identified in this AD, not identified by "67-01" on the modification plate, inspecting it by following the requirements of this AD. This AD is prompted by a report that a quality escape by a supplier has occurred and certain servos may have a loose nut, shaft, and clevis assembly due to improper lock-washer installation. An investigation after an accident revealed the clevis nut on the servo was loose. The actions specified by this AD are intended to prevent a malfunction of a servo in the flight control system and subsequent loss of control of the helicopter. 76 FR 66609 https://www.govinfo.gov/app/details/FR-2011-10-27/2011-27687 2011-27687 fr27oc11-5 RIN 2120-AA64 4910-13-P Docket No. FAA-2011-1035 Directorate Identifier 2011-SW-038-AD Amendment 39-16817 AD 2011-15-51 https://www.govinfo.gov/app/details/FR-2011-10-27/2011-27687 https://www.govinfo.gov/content/pkg/FR-2011-10-27/html/2011-27687.htm https://www.govinfo.gov/content/pkg/FR-2011-10-27/pdf/2011-27687.pdf Air Transportation Aircraft Aviation Safety Incorporation by Reference Safety 5 p. 66609 66613 76 FR 66609 Title 14 Part 39 14 CFR Part 39 RIN 2120-AA64 Airworthiness Directives; Bell Helicopter Textron Canada (Bell) Model 407 and 427 Helicopters; Federal Register Vol. 76, Issue RULE 2011-27687 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 2011-11-14 Docket No. FAA-2011-1035 Directorate Identifier 2011-SW-038-AD Amendment 39-16817 AD 2011-15-51 4910-13-P 2011-27687 Final rule; request for comments.

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 2011-15-51, which was sent previously to all known U.S. owners and operators of the specified Bell Model 407 and 427 helicopters by individual letters. This AD requires inspecting certain hydraulic servo actuators to determine whether the shaft turns independently of the nut or the clevis assembly. If the shaft turns independently, this AD requires replacing the servo with an airworthy servo. If the shaft does not turn independently, the AD requires inspecting to determine the condition of the lock washers. Based on the condition of the lock washers, the AD requires either replacing the servo with an airworthy servo, or if any tab of the lock washer is not flush against a flat surface of the nut or clevis assembly, bending it flush against a flat surface. The AD also requires reidentifying the servo by metal-impression stamping or by vibro- etching "67.01" onto the modification plate. Also, the AD requires before installing a servo with a part number or serial number identified in this AD, not identified by "67-01" on the modification plate, inspecting it by following the requirements of this AD. This AD is prompted by a report that a quality escape by a supplier has occurred and certain servos may have a loose nut, shaft, and clevis assembly due to improper lock-washer installation. An investigation after an accident revealed the clevis nut on the servo was loose. The actions specified by this AD are intended to prevent a malfunction of a servo in the flight control system and subsequent loss of control of the helicopter.

Effective November 14, 2011, to all persons except those persons to whom it was made immediately effective by Emergency AD 2011-15-51, issued on July 8, 2011, which contained the requirements of this amendment. Matt Wilbanks, Aviation Safety Engineer, 2601 Meacham Blvd, Fort Worth, Texas 76137, telephone (817) 222-5051, fax (817) 222-5961. Air Transportation Aircraft Aviation Safety Incorporation by Reference Safety Airworthiness Directives: Bell Helicopter Textron Canada (Bell) Model 407 and 427 Helicopters , http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html http://www.bellcustomer.com/files/ http://www.regulations.gov Vol. 76, no. 208 Office of the Federal Register, National Archives and Records Administration 2011-10-27 continuing daily deposited born digital 259 p. Table of Contents: AE 2.7: GS 4.107: AE 2.106: KF70.A2 https://www.govinfo.gov/app/details/FR-2011-10-27 P0b002ee180eb73ee 0097-6326 0042-1219 0364-1406 769-004-00000-9 000582072 f:fr27oc11 https://www.govinfo.gov/app/details/FR-2011-10-27 https://www.govinfo.gov/content/pkg/FR-2011-10-27/pdf/FR-2011-10-27.pdf https://www.govinfo.gov/content/pkg/FR-2011-10-27/xml/FR-2011-10-27.xml fdlp 66601 66848 DGPO 2011-10-27 2024-06-03 FR-2011-10-27 machine generated eng FR FR-2011-10-27 76 208