AD 2010-20-22 Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (RRD) Models Tay 620-15, Tay 650-15, and Tay 651-54 Turbofan Engines

This AD applies to Rolls-Royce Deutschland Ltd & Co KG (RRD) models Tay 620-15, Tay 650-15, and Tay 651-54 turbofan engines. These engines are installed on, but not limited to, Fokker F28 Mark 0070 and Mark 0100 airplanes and Boeing 727 series airplanes. Reason (d) Following a review of operational data of the Tay 651-54 engine, it has been found that the actual stress levels in the Tay 651-54 engine High Pressure Compressor (HPC) stages 1, 3, 6, 7 and 12 discs were higher than those originally assumed and therefore the approved lives needed to be reduced. We are issuing this AD to prevent HPC stages 1, 3, 6, 7, and 12 discs from exceeding the approved reduced life limits, which could result in an uncontained failure of a disc and damage to the airplane.

Unless already done, within 30 days after the effective date of this AD, amend the approved Airworthiness Limitation Section to incorporate the new, reduced life limits as follows: For Tay 651-54 Engines (1) The maximum approved lives (MAL) of the High Pressure Compressor (HPC) rotor discs are reduced to the MALs specified in the following Table 1 of this AD: Table 1—Tay 651-54 Engine Reduced Disc MAL by Part Number For Part No. The MAL is (i) HPC Stage 1 Disc JR18049 18,800 cycles. (ii) HPC Stage 3 Disc JR18743 18,100 cycles. (iii) HPC Stage 6 Disc JR18748 19,300 cycles. (iv) HPC Stage 7 Disc JR17365 17,300 cycles. (v) HPC Stage 12 Disc JR31928 18,900 cycles. For Tay 620-15 and Tay 650-15 Engines (2) The MAL of certain HPC rotor discs are reduced. The affected disc serial numbers and the reduced MAL are defined in Rolls-Royce Deutschland Ltd & Co KG Alert Non-Modification Service Bulletin TAY-72-A1740, dated February 11, 2009. (3) Thereafter, except as provided in paragraph (f) of this AD, no alternative replacement times may be approved for these parts. Other FAA AD Provisions (f) Alternative Methods of Compliance (AMOCs): 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 (g) Refer to mandatory continuing airworthiness information European Aviation Safety Agency Airworthiness Directive 2009-0092, dated April 17, 2009, for related information. (h) Contact Tara Chaidez, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: tara.chaidez@faa.gov; telephone (781) 238-7773; fax (781) 238-7199, for more information about this AD. Material Incorporated by Reference (i) You must use Rolls-Royce Deutschland Ltd & Co KG Alert Non-Modification Service Bulletin TAY-72-A1740, dated February 11, 2009, to do the actions required by this AD, unless the AD specifies otherwise. (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, D-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. Issued in Burlington, Massachusetts, on September 24, 2010. Francis A. Favara, Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 2010-24607 Filed 10-4-10; 8:45 am] BILLING CODE 4910-13-P

Unless already done, within 30 days after the effective date of this AD, amend the approved Airworthiness Limitation Section to incorporate the new, reduced life limits as follows: For Tay 651-54 Engines (1) The maximum approved lives (MAL) of the High Pressure Compressor (HPC) rotor discs are reduced to the MALs specified in the following Table 1 of this AD: Table 1—Tay 651-54 Engine Reduced Disc MAL by Part Number For Part No. The MAL is (i) HPC Stage 1 Disc JR18049 18,800 cycles. (ii) HPC Stage 3 Disc JR18743 18,100 cycles. (iii) HPC Stage 6 Disc JR18748 19,300 cycles. (iv) HPC Stage 7 Disc JR17365 17,300 cycles. (v) HPC Stage 12 Disc JR31928 18,900 cycles. For Tay 620-15 and Tay 650-15 Engines (2) The MAL of certain HPC rotor discs are reduced. The affected disc serial numbers and the reduced MAL are defined in Rolls-Royce Deutschland Ltd & Co KG Alert Non-Modification Service Bulletin TAY-72-A1740, dated February 11, 2009. (3) Thereafter, except as provided in paragraph (f) of this AD, no alternative replacement times may be approved for these parts. Other FAA AD Provisions (f) Alternative Methods of Compliance (AMOCs): 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 (g) Refer to mandatory continuing airworthiness information European Aviation Safety Agency Airworthiness Directive 2009-0092, dated April 17, 2009, for related information. (h) Contact Tara Chaidez, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: tara.chaidez@faa.gov; telephone (781) 238-7773; fax (781) 238-7199, for more information about this AD. Material Incorporated by Reference (i) You must use Rolls-Royce Deutschland Ltd & Co KG Alert Non-Modification Service Bulletin TAY-72-A1740, dated February 11, 2009, to do the actions required by this AD, unless the AD specifies otherwise. (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, D-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. Issued in Burlington, Massachusetts, on September 24, 2010. Francis A. Favara, Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 2010-24607 Filed 10-4-10; 8:45 am] BILLING CODE 4910-13-P