2022-20-12: 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: 2022-20-12 General Electric Company: Amendment 39-22196; Docket No. FAA-2022-0467; Project Identifier AD-2022-00174-E. (a) Effective Date This airworthiness directive (AD) is effective November 16, 2022. (b) Affected ADs None. (c) Applicability This AD applies to General Electric Company (GE) GEnx-1B54/P2, GEnx-1B58/P2, GEnx-1B64/P2, GEnx-1B67/P2, GEnx-1B70/P2, GEnx-1B70C/P2, GEnx-1B70/72/P2, GEnx-1B70/75/P2, GEnx-1B74/75/P2, GEnx-1B75/P2, GEnx-1B76/P2, GEnx-1B76A/P2, GEnx-1B78/P2, GEnx-2B67, GEnx-2B67B, and GEnx-2B67/P model turbofan engines. (d) Subject Joint Aircraft System Component Code 7230, Turbine Engine Compressor Section; 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 compressor discharge pressure (CDP) seals, interstage seals, high-pressure turbine (HPT) rotor stage 2 disks, and stages 6-10 compressor rotor spools. The FAA is issuing this AD to prevent failure of the CDP seal, interstage seal, HPT rotor stage 2 disk, and stages 6-10 compressor rotor spool. 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 all affected GEnx-1B model turbofan engines, within 90 days after the effective date of this AD, revise the airworthiness limitations section (ALS) of the existing GEnx-1B Engine Manual (EM) and the operator's existing approved maintenance program or inspection program, as applicable, by inserting the following information into the applicable table for their respective part numbers: (i) For stages 6-10 compressor rotor spool, part number (P/N) 2628M56G01, insert the information in Table 1 to paragraph (g)(1)(i) of this AD. Table 1 to Paragraph (g)(1)(i) -Stages 6-10 Compressor Rotor Spool, P/N 2628M56G01 Part name Part No. Life cycles -1B54/P2 Life cycles -1B58/P2 -1B64/P2 -1B67/P2 -1B70/P2 Life cycles -1B70C/P2 Life cycles -1B70/72/P2 -1B70/75/P2 -1B74/75/P2 -1B75/P2 Life cycles -1B76/P2 Life cycles -1B76A/P2 Life cycles -1B78/P2 Spool, Stage 6-10 2628M56G01 For part serial numbers listed in Table 1 of GEnx-1B SB 72-0484, latest revision 10,300 10,300 10,300 10,300 8,500 8,500 8,500 Spool, Stage 6-10 2628M56G01 For part serial numbers listed in Table 2 of GEnx-1B SB 72-0484, latest revision 5,700 5,700 5,700 5,700 4,800 4,800 4,800 (ii) For CDP seal, P/N 2383M82P03, insert the information in Table 2 to paragraph (g)(1)(ii) of this AD. Table 2 to Paragraph (g)(1)(ii) -CDP Seal, P/N 2383M82P03 Part name Part No. Life cycles -1B54/P2 Life cycles -1B58/P2 -1B64/P2 -1B67/P2 -1B70/P2 Life cycles -1B70C/P2 Life cycles -1B70/72/P2 -1B70/75/P2 -1B74/75/P2 -1B75/P2 Life cycles -1B76/P2 Life cycles -1B76A/P2 Life cycles -1B78/P2 Seal, CDP 2383M82P03 For part serial numbers listed in Table 3 of GEnx-1B SB 72-0484, latest revision 6,100 6,100 6,100 6,100 5,300 5,300 5,300 Seal, CDP 2383M82P03 For part serial numbers listed in Table 4 of GEnx-1B SB 72-0484, latest revision 13,400 13,400 13,400 13,400 9,300 9,300 9,300 Seal, CDP 2383M82P03 For part serial numbers listed in Table 5 of GEnx-1B SB 72-0484, latest revision 3,600 3,600 3,600 3,600 2,900 2,900 2,900 (iii) For interstage seal, P/N 2383M85P04, insert the information in Table 3 to paragraph (g)(1)(iii) of this AD. Table 3 to Paragraph (g)(1)(iii) -Interstage Seal, P/N 2383M85P04 Part name Part No. Life cycles -1B54/P2 Life cycles -1B58/P2 -1B64/P2 -1B67/P2 -1B70/P2 Life cycles -1B70C/P2 Life cycles -1B70/72/P2 -1B70/75/P2 -1B74/75/P2 -1B75/P2 Life cycles -1B76/P2 Life cycles -1B76A/P2 Life cycles -1B78/P2 Seal, Interstage 2383M85P04 For part serial numbers listed in Table 6 of GEnx-1B SB 72-0484, latest revision 10,500 10,500 10,500 10,500 6,400 6,400 6,400 Seal, Interstage 2383M85P04 For part serial numbers listed in Table 7 of GEnx-1B SB 72-0484, latest revision 15,000 15,000 15,000 15,000 10,500 10,500 10,500 Seal, Interstage 2383M85P04 For part serial numbers listed in Table 8 of GEnx-1B SB 72-0484, latest revision 5,500 5,500 5,500 5,500 2,800 2,800 2,800 (iv) For HPT rotor stage 2 disk, P/N 2383M86P02, insert the information in Table 4 to paragraph (g)(1)(iv) of this AD. Table 4 to Paragraph (g)(1)(iv) -HPT Rotor Stage 2 Disk, P/N 2383M86P02 Part name Part No. Life cycles -1B54/P2 Life cycles -1B58/P2 -1B64/P2 -1B67/P2 -1B70/P2 Life cycles -1B70C/P2 Life cycles -1B70/72/P2 -1B70/75/P2 -1B74/75/P2 -1B75/P2 Life cycles -1B76/P2 Life cycles -1B76A/P2 Life cycles -1B78/P2 Disk, Stage 2 2383M86P02 For part serial numbers listed in Table 9 of GEnx-1B SB 72-0484, latest revision 6,900 6,900 6,900 6,900 5,100 5,100 5,100 Disk, Stage 2 2383M86P02 For part serial numbers listed in Table 10 of GEnx-1B SB 72-0484, latest revision 10,400 10,400 10,400 10,400 7,500 6,800 7,500 Disk, Stage 2 2383M86P02 For part serial numbers listed in Table 11 of GEnx-1B SB 72-0484, latest revision 3,800 3,800 3,800 3,800 3,000 3,000 3,000 (2) For all affected GEnx-2B model turbofan engines, within 90 days after the effective date of this AD, revise the ALS of the existing GEnx-2B EM and the operator's existing approved maintenance program or inspection program, as applicable, by inserting the following information into the applicable table for their respective part numbers: (i) For stages 6-10 compressor rotor spool, P/N 2628M56G01, insert the information in Table 5 to paragraph (g)(2)(i) of this AD. Table 5 to Paragraph (g)(2)(i) -Stages 6-10 Compressor Rotor Spool, P/N 2628M56G01 Part name Part No. Life cycles -2B67 Life cycles -2B67B Life cycles -2B67/P Spool, Stage 6-10 2628M56G01 For part serial numbers listed in Table 1 of GEnx-2B SB 72-0423, latest revision 10,300 Spool, Stage 6-10 2628M56G01 For part serial numbers listed in Table 2 of GEnx-2B SB 72-0423, latest revision 5,700 (ii) For CDP seal, P/N 2383M82P03, insert the information in Table 6 to paragraph (g)(2)(ii) of this AD. Table 6 to Paragraph (g)(2)(ii) -CDP Seal, P/N 2383M82P03 Part name Part No. Life cycles -2B67 Life cycles -2B67B Life cycles -2B67/P Seal, CDP 2383M82P03 For part serial numbers listed in Table 3 of GEnx-2B SB 72-0423, latest revision 6,100 Seal, CDP 2383M82P03 For part serial numbers listed in Table 4 of GEnx-2B SB 72-0423, latest revision 13,400 Seal, CDP 2383M82P03 For part serial numbers listed in Table 5 of GEnx-2B SB 72-0423, latest revision 3,600 (iii) For interstage seal, P/N 2383M85P04, insert the information in Table 7 to paragraph (g)(2)(iii) of this AD. Table 7 to Paragraph (g)(2)(iii) -Interstage Seal, P/N 2383M85P04 Part name Part No. Life cycles -2B67 Life cycles -2B67B Life cycles -2B67/P Seal, Interstage 2383M85P04 For part serial numbers listed in Table 6 of GEnx-2B SB 72-0423, latest revision 10,500 Seal, Interstage 2383M85P04 For part serial numbers listed in Table 7 of GEnx-2B SB 72-0423, latest revision 15,000 Seal, Interstage 2383M85P04 For part serial numbers listed in Table 8 of GEnx-2B SB 72-0423, latest revision 5,500 (iv) For HPT rotor stage 2 disk, P/N 2383M86P02, insert the information in Table 8 to paragraph (g)(2)(iv) of this AD. Table 8 to Paragraph (g)(2)(iv) -HPT Rotor Stage 2 Disk P/N, 2383M86P02 Part name Part No. Life cycles -2B67 Life cycles -2B67B Life cycles -2B67/P Disk, Stage 2 2383M86P02 For part serial numbers listed in Table 9 of GEnx-2B SB 72-0423, latest revision 6,900 Disk, Stage 2 2383M86P02 For part serial numbers listed in Table 10 of GEnx-2B SB 72-0423, latest revision 10,400 Disk, Stage 2 2383M86P02 For part serial numbers listed in Table 11 of GEnx-2B SB 72-0423, latest revision 3,800 (h) 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 (i) 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. (i) Related Information 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 . (j) Material Incorporated by Reference None. Issued on September 19, 2022. Christina Underwood, Acting Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2022-22061 Filed 10-11-22; 8:45 am]BILLING CODE 4910-13-P