2009-22-01: Low-pressure turbine disk stage 2 or stage 3

2009-22-01 Rolls-Royce Deutschland Ltd & Co KG (RRD) (formerly Rolls-Royce plc, Derby, England): Amendment 39-16052. Docket No. FAA-2007-0037; Directorate Identifier 2007-NE-41-AD. Effective Date (a) This airworthiness directive (AD) becomes effective November 12, 2009. Affected ADs (b) This AD supersedes AD 2008-10-14, Amendment 39-15521. Applicability (c) This AD applies to RRD Tay 650-15 turbofan engines that have a serial number listed in Table 1 or Table 2 of this AD, and low- pressure (LP) turbine module M05300AA installed. These engines are installed on, but not limited to, Fokker F28 Mark 0100 airplanes. Table 1--Affected Tay 650-15 Engines by Serial Number (Carried Forward From AD 2008-10-14) Engine Serial Number 17251 17255 17256 17273 17275 17280 17281 17282 17300 17301 17327 17332 17365 17393 17437 17443 17470 17520 17521 17523 17539 17542 17556 17561 17562 17563 17580 17581 17612 17618 17635 17637 1764517661 17686 17699 17701 17702 17736 17737 17738 17739 17741 17742 17808 Table 2--Affected Tay 650-15 Engines by Serial Number (Added New in This AD) Engine Serial Number 17249 17303 17358 17370 17425 17426 17433 17438 17445 17446 17460 17474 17478 17490 17491 17517 17518 17522 17534 17535 17536 17538 17540 17541 17552 17553 17585 17613 17723 17724 17740 17759 17760 17807 Reason (d) Strip results from some of the engines listed in the applicability section of this directive revealed excessively corroded low-pressure turbine disks stage 2 and stage 3. The corrosion is considered to be caused by the environment in which these engines are operated. Following a life assessment based on the strip findings it is concluded that inspections for corrosion attack are required. The action specified by this AD is intended to avoid a failure of a low-pressure turbine disk stage 2 or stage 3 due to potential corrosion problems which couldresult in uncontained engine failure and damage to the airplane. We are issuing this AD to detect corrosion that could cause the stage 2 or stage 3 disk of the LP turbine to fail and result in an uncontained failure of the engine. Actions and Compliance (e) Unless already done, do the following actions. (1) Prior to accumulating 11,700 flight cycles (FC) since new, and thereafter at intervals not exceeding 11,700 FC of the engine, inspect the LP turbine disks stage 2 and stage 3 for corrosion in accordance with RRD Alert Service Bulletin No. TAY-72-A1524, Revision 2, dated June 13, 2008. (2) For engines that already exceed 11,700 FC on the effective date of this AD, perform the inspection within 90 days after the effective date of this AD. (3) When, during any of the inspections as required by paragraph (e)(1) of this directive, corrosion is found, replace the affected parts. The RRD TAY 650 Engine Manual--E-TAY-3RR, Tasks 72-52-23-200- 000 and 72-52-24-200-000 contains guidance on performing the inspection for corrosion and rejection criteria. Previous Credit (f) Initial inspections done before the effective date of this AD on LP turbine disks stage 2 and stage 3 listed in Table 1 of this AD using RRD Alert Service Bulletin No. TAY-72-A1524, Revision 1, dated September 1, 2006, comply with the initial inspection requirements specified in this AD. Alternative Methods of Compliance (AMOCs) (g) The Manager, Engine Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Related Information (h) Refer to European Aviation Safety Agency AD 2008-0122, dated July 1, 2008, for related information. (i) Contact Jason Yang, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: jason.yang@faa.gov; telephone (781) 238-7747; fax (781) 238-7199, for moreinformation about this AD. Material Incorporated by Reference (j) You must use Rolls-Royce Deutschland Alert Service Bulletin No. TAY-72-A1524, Revision 2, dated June 13, 2008, to do the actions required by this AD. (1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified in this AD, contact Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, Dahlwitz, 15827 Blankenfelde-Mahlow, Germany; telephone 49 (0) 33-7086-1768; fax 49 (0) 33-7086-3356. (3) You may review copies at the FAA, New England Region, 12 New England Executive Park, Burlington, MA; or 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.