Airworthiness directives › 2022-18-06
AD 2022-18-06 Airworthiness Directives; General Electric Company Turbofan Engines
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
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.
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.
Affected ADs
None.
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