Airworthiness Directive · Amendment 39-22196 · Turbine engine compressor section
General Electric Company Turbofan Engines
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.
The FAA is adopting a new airworthiness directive (AD) for certain General Electric Company (GE) GEnx-1B and GEnx-2B model turbofan engines. 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. This AD requires revising the airworthiness limitations section (ALS) of the applicable GEnx-1B and GEnx-2B Engine Manual (EM) and the operator's existing approved maintenance program or inspection program, as applicable, to incorporate reduced life limits for these parts. The FAA is issuing this AD to address the unsafe condition on these products.
(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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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 |
