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 2013_register executive 2013-06-07 article Proposed Rules D09002ee1c7fb6414 D09002ee1c7fb648c 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 We propose to adopt a new airworthiness directive (AD) for certain Bell Model 206B and 206L helicopters. This proposed AD would require installing a placard beneath the engine power dual tachometer and revising the operating limitations section of the rotorcraft flight manual (RFM). This proposed AD is prompted by several incidents of third stage engine turbine wheel failures, which were caused by excessive vibrations at certain engine speeds during steady-state operations. The proposed actions are intended to alert pilots to avoid certain engine speeds during steady-state operations, prevent failure of the third stage engine turbine, engine power loss, and subsequent loss of control of the helicopter. 78 FR 34280 https://www.govinfo.gov/app/details/FR-2013-06-07/2013-13481 2013-13481 fr07jn13-9 RIN 2120-AA64 4910-13-P Docket No. FAA-2013-0488 Directorate Identifier 2008-SW-002-AD https://www.govinfo.gov/app/details/FR-2013-06-07/2013-13481 https://www.govinfo.gov/content/pkg/FR-2013-06-07/html/2013-13481.htm https://www.govinfo.gov/content/pkg/FR-2013-06-07/pdf/2013-13481.pdf Air Transportation Aircraft Aviation Safety Incorporation by Reference Safety 3 p. 34280 34282 78 FR 34280 Title 14 Part 39 14 CFR Part 39 RIN 2120-AA64 Airworthiness Directives; Bell Helicopter Textron Canada Limited (Bell) Helicopters; Federal Register Vol. 78, Issue PRORULE 2013-13481 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 2013-08-06 Docket No. FAA-2013-0488 Directorate Identifier 2008-SW-002-AD 4910-13-P 2013-13481 Notice of proposed rulemaking (NPRM).

We propose to adopt a new airworthiness directive (AD) for certain Bell Model 206B and 206L helicopters. This proposed AD would require installing a placard beneath the engine power dual tachometer and revising the operating limitations section of the rotorcraft flight manual (RFM). This proposed AD is prompted by several incidents of third stage engine turbine wheel failures, which were caused by excessive vibrations at certain engine speeds during steady-state operations. The proposed actions are intended to alert pilots to avoid certain engine speeds during steady-state operations, prevent failure of the third stage engine turbine, engine power loss, and subsequent loss of control of the helicopter.

We must receive comments on this proposed AD by August 6, 2013. Chinh Vuong, Aviation Safety Engineer, Safety Management Group, Rotorcraft Directorate, FAA, 2601 Meacham Blvd., Fort Worth, Texas 76137; telephone (817) 222-5110; email chinh.vuong@faa.gov. Air Transportation Aircraft Aviation Safety Incorporation by Reference Safety Airworthiness Directives: Bell Helicopter Textron Canada Limited (Bell) Helicopters , chinh.vuong@faa.gov http://www.bellcustomer.com/files/ http://www.regulations.gov Vol. 78, no. 110 Office of the Federal Register, National Archives and Records Administration 2013-06-07 continuing daily deposited born digital 308 p. Table of Contents: AE 2.7: GS 4.107: AE 2.106: KF70.A2 https://www.govinfo.gov/app/details/FR-2013-06-07 P0b002ee184f8f42d 0097-6326 0042-1219 0364-1406 769-004-00000-9 000582072 f:fr07jn13 https://www.govinfo.gov/app/details/FR-2013-06-07 https://www.govinfo.gov/content/pkg/FR-2013-06-07/pdf/FR-2013-06-07.pdf https://www.govinfo.gov/content/pkg/FR-2013-06-07/xml/FR-2013-06-07.xml fdlp 34245 34543 DGPO 2013-06-07 2024-06-03 FR-2013-06-07 machine generated eng FR FR-2013-06-07 78 110