Engine - High Pressure Turbine Rotor Stage 2 Disks - Inspection / Replacement
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators must perform immersion ultrasonic inspections of the specified HPT rotor stage 2 disks by January 21, 2021. If any disk shows rejectable indications, it must be replaced with an approved part before further flight. Operators should consult the referenced GE service bulletins and maintain documentation of compliance. Requests for alternative compliance methods may be submitted with supporting safety data.
Summary
The Federal Aviation Administration's Airworthiness Directive 2020-25-10 is a final rule addressing certain General Electric Company GEnx-1B and GEnx-2B model turbofan engines equipped with specific high-pressure turbine (HPT) rotor stage 2 disks. This directive mandates inspection and potential replacement of these disks due to the risk of undetected subsurface anomalies that could lead to uncontained disk failure. The directive applies to multiple GEnx engine variants including GEnx-1B64/P2, GEnx-1B67/P2, GEnx-1B70/75/P2, and others.
What changed
This new airworthiness directive introduces a requirement for immersion ultrasonic inspection (USI) of the affected HPT rotor stage 2 disks. Depending on inspection results, operators must replace any disk found with rejectable indications with a part eligible for installation. The directive clarifies that it does not supersede previous ADs but addresses a separate unsafe condition with distinct compliance requirements.
Why it matters
This directive is critical for aviation professionals as it addresses a potential safety hazard that could result in catastrophic engine failure. Operators and maintenance organizations must ensure compliance to prevent uncontained failures, which could jeopardize aircraft safety and lead to costly unscheduled maintenance. Compliance teams must carefully manage inspection schedules and part replacements to maintain airworthiness and regulatory adherence.
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