2007-03-13: High pressure turbine (HPT) blade platforms and shrouds

2007-03-13 Rolls-Royce Deutschland Ltd & Co KG (formerly Rolls-Royce plc): Amendment 39-149824. Docket No. FAA-2006-25272; Directorate Identifier 2006-NE-16-AD. Effective Date (a) This airworthiness directive (AD) becomes effective March 19, 2007. Affected ADs (b) None. Applicability (c) This AD applies to Rolls-Royce Deutschland Ltd & Co KG (RRD) Dart 528, 529, 532, 535, 542, and 552 series turboprop engines. These engines are installed on, but not limited to, Hawker Siddeley, Argosy AW.650, Fairchild Hiller F-27, F-27A, F-27B, F-27F, F-27G, F- 27J, FH-227, FH-227B, FH-227C, FH-227D, FH-227E, Fokker F.27 all makes; British Aircraft Corporation Viscount 744, 745D and 810; and Gulfstream G-159 airplanes. Unsafe Condition (d) This AD results from reports of high pressure turbine (HPT) disk rim failures. We are issuing this AD to prevent HPT disk rim failures resulting in the release of portions of the HPT disk, uncontained engine failure, and damageto the airplane. Compliance (e) You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. (f) Using RRD Dart Service Bulletin (SB) Da72-543, dated July 11, 2003, and the scheme detailed in RRD Repair Instruction, "Restoration of Platform and Shroud gaps by welding, DRS 611,'' dated July 15, 2005, inspect and repair HPT blade platforms and shroud abutment faces by weld build-up: (1) After no more than 1,500 flight hours from the date of issue of this AD, if the engine has not been previously inspected or reworked to the DRS 611 standard; (2) Each time new blades are installed; and (3) Before exceeding 7,400 hours since last HPT blade inspection or rework to DRS 611 standard. Alternative Methods of Compliance (g) The Manager, Engine Certification Office, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19. Related Information (h) LBA airworthiness directive 2003-217, dated August 7, 2003, also addresses the subject of this AD. (i) Contact Jason Yang, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; telephone (781) 238-7747, fax (781) 238-7199; e-mail: jason.yang@faa.gov for more information about this AD. Material Incorporated by Reference (j) You must use Rolls-Royce Deutschland Ltd & Co KG (RRD) Dart Service Bulletin Da72-543, dated July 11, 2003, and RRD Dart Repair Instruction, "Restoration of Platform and Shroud Gaps by Gaps by Welding, DRS 611,'' dated July 15, 2005, to perform the actions required by this AD. (1) The Director of the Federal Register approved the incorporation by reference of this service bulletin in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. (2) Contact Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, D-15827 Dahlewitz, Germany; telephone 49 (0) 33-7086-1768; fax 49 (0) 33-7086-335 for a copy of this service information. (3) You may review copies at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call (202) 741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.