2022-18-06: Turbine Engine Compressor Section, Turbine Section

1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. 2. The FAA amends § 39.13 by adding the following new airworthiness directive: 2022-18-06 General Electric Company: Amendment 39-22157; Docket No. FAA-2022-0516; Project Identifier AD-2022-00262-E. (a) Effective Date This airworthiness directive (AD) is effective October 26, 2022. (b) Affected ADs None. (c) Applicability This AD applies to: (1) General Electric Company (GE) GE90-110B1 and GE90-115B model turbofan engines; and (2) GE GE90-76B, GE90-85B, GE90-90B, and GE90-94B model turbofan engines with an installed interstage high-pressure turbine (HPT) rotor seal with part number (P/N) 2629M47P01 and serial number (S/N) NCU5430D. (d) Subject Joint Aircraft System Component (JASC) Code 7230, Turbine Engine Compressor Section, and JASC Code 7250, Turbine Section. (e) Unsafe Condition This AD was prompted by the detection of melt-related freckles in the forgings and billets, which may reduce the life of certain rotating compressor discharge pressure (CDP) HPT seals (rotating CDP seals), interstage HPT rotor seals, and HPT rotor stage 2 disks. The FAA is issuing this AD to prevent failure of the rotating CDP seal, interstage HPT rotor seal, and HPT rotor stage 2 disk. The unsafe condition, if not addressed, could result in uncontained debris release, damage to the engine, and damage to the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions (1) For affected GE90-110B1 and GE90-115B model turbofan engines, within 90 days after the effective date of this AD, revise the airworthiness limitations section (ALS) of the existing GE90-100 Engine Manual (EM) and the operator's existing approved maintenance program or inspection program, as applicable, by inserting the following information: (i) For rotating CDP seal P/N 2479M03P01, insert the information in Table 1 to paragraph (g)(1)(i) of this AD. Table 1 to Paragraph ( g )(1)(i)-Rotating CDP Seal P/N 2479M03P01 Part name Part No. Life cycles Seal, CDP 2479M03P01, For part serial numbers NOT listed in SB 72-0851, latest revision 15,000 Seal, CDP 2479M03P01, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A Table 11 5,300 Seal, CDP 2479M03P01, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A Table 12 10,400 Seal, CDP 2479M03P01, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A, Table 13 13,900 (ii) For interstage HPT rotor seal P/N 2505M72P01, insert the information in Table 2 to paragraph (g)(1)(ii) of this AD. Table 2 to Paragraph ( g )(1)(ii)-Interstage HPT Rotor Seal P/N 2505M72P01 Part name Part No. Life cycles Seal, Interstage 2505M72P01, For part serial numbers NOT listed in SB 72-0851, latest revision 15,000 Seal, Interstage 2505M72P01, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A Table 8 5,500 Seal, Interstage 2505M72P01, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A Table 9 10,900 Seal, Interstage 2505M72P01, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A Table 10 14,300 (iii) For HPT rotor stage 2 disk P/N 2505M73P03, insert the information in Table 3 to paragraph (g)(1)(iii) of this AD. Table 3 to Paragraph ( g )(1)(iii)-HPT Rotor Stage 2 Disk P/N 2505M73P03 Part name Part No. Life cycles Disk, Stage 2 2505M73P03, For part serial numbers NOT listed in SB 72-0851, latest revision 15,000 Disk, Stage 2 2505M73P03, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A Table 1 3,500 Disk, Stage 2 2505M73P03, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A Table 2 5,100 Disk, Stage 2 2505M73P03, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A Table 3 5,800 Disk, Stage 2 2505M73P03, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A Table 4 7,200 Disk, Stage 2 2505M73P03, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A Table 5 8,000 Disk, Stage 2 2505M73P03, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A Table 6 8,300 Disk, Stage 2 2505M73P03, For part serial numbers listed in SB 72-0851, latest revision APPENDIX A Table 7 8,800 (2) For affected GE90-76B, GE90-85B, GE90-90B, and GE90-94B model turbofan engines, before the interstage HPT rotor seal, P/N 2629M47P01 and S/N NCU5430D, accumulates 7,400 cycles since new, remove the affected interstage HPT rotor seal from service and replace with a part eligible for installation. (h) Definitions For the purpose of this AD, a "part eligible for installation" is any interstage HPT rotor seal that does not have P/N 2629M47P01 and S/N NCU5430D. (i) Alternative Methods of Compliance (AMOCs) (1) The Manager, ECO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in paragraph (j)(1) of this AD and email to: ANE-AD-AMOC@faa.gov. (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office. (j) Related Information (1) For more information about this AD, contact Alexei Marqueen, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone: (781) 238-7178; email: Alexei.T.Marqueen@faa.gov . (2) For service information identified (but not incorporated by reference) in this AD, contact General Electric Company, 1 Neumann Way, Cincinnati, OH 45215; phone: (513) 552-3272; email: aviation.fleetsupport@ge.com; website: www.ge.com. You may view this referenced service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA 01803. For information on the availability of this material at the FAA, call (817) 222-5110. (k) Material Incorporated by Reference None. Issued on August 18, 2022. Christina Underwood, Acting Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2022-19853 Filed 9-20-22; 8:45 am]BILLING CODE 4910-13-P