AD 2010-09-14 Airworthiness Directives; CFM International, S.A. CFM56-5B1/P, -5B2/P, -5B3/P, -5B3/P1, -5B4/P, -5B5/P, -5B6/P, -5B7/P, -5B8/P, -5B9/P, -5B1/2P, -5B2/2P, -5B3/2P, -5B3/2P1, -5B4/2P, -5B4/P1, -5B6/2P, -5B4/2P1, and -5B9/2P Turbofan Engines

This AD applies to CFM International, S.A. CFM56-5B1/P, -5B2/P, -5B3/P, -5B3/P1, -5B4/P, -5B5/P, -5B6/P, -5B7/P, -5B8/P, -5B9/P, -5B1/2P, -5B2/2P, -5B3/2P, -5B3/2P1, -5B4/2P, -5B4/P1, -5B6/2P, -5B4/2P1, and -5B9/2P turbofan engines. These engines are installed on, but not limited to, Airbus A318, A319, A320, and A321 series airplanes.

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) On the effective date of this AD, and at any time after the effective date of this AD, for CFM International, S.A. CFM56-5B1/P, -5B2/P, -5B3/P, -5B3/P1, -5B4/P, -5B4/P1, -5B5/P, -5B6/P, -5B7/P, -5B8/P and -5B9/P turbofan engines: (1) Monitor and calculate engine EGT margin deterioration. Use paragraphs 3.A.(2) and 3.A.(3) of the Accomplishment Instructions and Appendix A of CFM International, S.A. Alert Service Bulletin (ASB) No. CFM56-5B S/B 72-A0722, Revision 1, dated March 20, 2009, to do the monitoring and calculating. (2) As mandatory terminating action to the repetitive recalculating and monitoring of EGT margin deterioration, remove FADEC software version 5.B.Q and earlier versions from engines that have greater than 75 °C of EGT margin deterioration within 150 additional cycles-in-service (CIS). (3) As mandatory terminating action to the repetitive recalculating and monitoring of EGT margin deterioration, remove FADEC software version 5.B.Q and earlier versions from engines that have less than or equal to 75 °C of EGT margin deterioration within 900 additional CIS. (g) On the effective date of this AD, and at any time after the effective date of this AD, for CFM International, S.A. CFM56-5B1/2P, -5B2/2P, -5B3/2P, -5B3/2P1, -5B4/2P, -5B4/2P1, -5B6/2P and -5B9/2P turbofan engines: (1) Monitor and calculate engine EGT margin deterioration. Use paragraphs 3.A.(2) and 3.A.(3) of the Accomplishment Instructions and Appendix A of CFM International, S.A. ASB No. CFM56-5B S/B 72-A0722, Revision 1, dated March 20, 2009, to do the monitoring and calculating. (2) Remove engines from service that have greater than 75 °C of EGT margin deterioration within 150 additional CIS. Installation Prohibitions (h) For engines listed in paragraph (f) of this AD, after the effective date of this AD, do not install FADEC software version 5.B.Q or any earlier software versions. (i) For engines listed in paragraph (g) of this AD, after the effective date of this AD, do not install an engine that has greater than 75 °C of EGT margin deterioration. Interim Actions (j) These actions are interim actions and we anticipate further rulemaking actions in the future, including further action to address the remaining engines in service that are above 75 °C deterioration of EGT margin. Alternative Methods of Compliance (AMOCs) (k) 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 (l) Refer to European Aviation Safety Agency Airworthiness Directive 2009-0088, Revision 1, dated April 28, 2009, for related information. (m) Contact Wayne Maguire, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: wayne.maguire@faa.gov; telephone (781) 238-7778; fax (781) 238-7199, for more information about this AD. Material Incorporated by Reference (n) You must use CFM International, S. A. Alert Service Bulletin No. CFM56-5B S/B 72-A0722, Revision 1, dated March 20, 2009, to perform the EGT calculating and monitoring required by this AD. 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. Contact CFM International, S.A., Technical Customer Support, 1 Neumann Way, Cincinnati, OH 45215; telephone (513) 552-3272; fax (513) 552-3329, Web address http://customer.geae.com, for a copy of this service information. 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 April 23, 2010. Peter A. White, Assistant Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 2010-10177 Filed 5-3-10; 8:45 am] BILLING CODE 4910-13-P

This AD results from a reduction of the affected engine models listed in AD 2009-01-01 from 25 to 19, a reduction in the engine exhaust gas temperature (EGT) margin deterioration threshold from 80 °C to 75 °C, the introduction of terminating action to the continuous EGT monitoring for certain engines, and a change to the removal plan for the remaining engines if the EGT margin deterioration is greater than 75 °C. We are issuing this AD to prevent high-pressure compressor stalls, which could prevent continued safe flight or landing.