Airworthiness Directive · Amendment 39-23269 · Turbine engine compressor section
General Electric Company Engines
This AD applies to General Electric Company Model GEnx-1B64, GEnx-1B64/P1, GEnx-1B64/P2, GEnx-1B67, GEnx-1B67/P1, GEnx-1B67/P2, GEnx-1B70, GEnx-1B70/75/P1, GEnx-1B70/75/P2, GEnx-1B70/P1, GEnx-1B70/P2, GEnx-1B70C/P1, GEnx-1B70C/P2, GEnx-1B74/75/P1, GEnx-1B74/75/P2, GEnx-1B76/P2, Genx-1B76A/P2, GEnx-2B67, GEnx-2B67/P, and GEnx-2B67B engines with a high-pressure compressor (HPC) stage 5 blisk having part number (P/N) 2357M35P02 installed and a serial number (S/N) referenced in paragraphs (c)(1) through (3) of this AD:
(1) S/N TMT214T8
(2) S/N TMT214T9
(3) S/N TMT218UA
The FAA is adopting a new airworthiness directive (AD) for certain General Electric Company (GE) Model GEnx-1B64, GEnx-1B64/P1, GEnx-1B64/P2, GEnx-1B67, GEnx-1B67/P1, GEnx-1B67/P2, GEnx-1B70, GEnx- 1B70/75/P1, GEnx-1B70/75/P2, GEnx-1B70/P1, GEnx-1B70/P2, GEnx-1B70C/P1, GEnx-1B70C/P2, GEnx-1B74/75/P1, GEnx-1B74/75/P2, GEnx-1B76/P2, Genx- 1B76A/P2, GEnx-2B67, GEnx-2B67/P, and GEnx-2B67B engines. This AD was prompted by a report of a quality escape for certain high-pressure compressor (HPC) stage 5 blisks manufactured from a single forged ingot with a nonconforming indication. This AD requires replacement of certain HPC stage 5 blisks with parts eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
For the purpose of this AD:
(1) A part “eligible for installation” is any HPC stage 5 blisk that does not have a P/N and S/N identified in paragraph (c) of this AD.
(2) A “piece-part exposure” is when the affected part is removed from the engine and completely disassembled.
At the next piece-part exposure or before exceeding 7,700 cycles since new, whichever occurs first after the effective date of this AD, remove the affected HPC stage 5 blisk from service and replace with a part eligible for installation.
