Airworthiness directives › 2022-20-12
AD 2022-20-12 Airworthiness Directives; General Electric Company Turbofan Engines
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
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
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.
Affected ADs
None.
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