Airworthiness directives › 2017-26-01
AD 2017-26-01 Airworthiness Directives; General Electric Company Turbofan Engines
Applicability*9
This AD applies to General Electric Company (GE) GEnx-1B64/P2, -1B67/P2, -1B70/P2, -1B70/75/P2, -1B70C/P2, and -1B74/75/P2 turbofan engines, with a high-pressure turbine (HPT) stage 1 blade retainer, part number (P/N) 2445M91P01 or 2383M99P02, with a serial number listed in Planning Information, Paragraph 1.A., of GE GEnx-1B Service Bulletin (SB) 72-0326 R02, revised August 16, 2017.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) At the next piece-part exposure of the HPT stage 1 blade retainer after the effective date of this AD, perform a one-time inspection of the HPT stage 1 blade retainer in accordance with the Accomplishment Instructions, paragraph 3.A.(1), in GE GEnx-1B SB 72-0326 R02, revised August 16, 2017. (2) If any cracks are found in the HPT stage 1 blade retainer, or the retainer does not meet the dimensional criteria found in the Accomplishment Instructions, Paragraph 3.A.(1), in GEnx-1B SB 72-0326 R02, revised August 16, 2017, replace the HPT stage 1 blade retainer with a part eligible for installation.
Unsafe condition
This AD was prompted by a report of the failure of the HPT stage 1 blade retainer and subsequent in-flight shutdown of the engine. We are issuing this AD to prevent failure of the HPT stage 1 blade retainer. The unsafe condition, if not corrected, could result in failure of one or more engines, loss of thrust control, and damage to the airplane.
Affected ADs
None.
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