Engine - High Pressure Turbine Shroud / Low Pressure Turbine Nozzle Assemblies - Inspection
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators must perform a visual inspection of the combustion case by June 26, 2025, and repair any wear or gouges found. Additionally, the affected HPT shroud/LPT nozzle assemblies must be reworked to add positive retention of the support air duct. Compliance with the directive should follow the procedures outlined in GE Service Bulletin 72-0351 R01, and requests for alternative methods of compliance can be submitted to the FAA if needed.
Summary
The Federal Aviation Administration's Airworthiness Directive 2025-10-04 addresses all General Electric Company Model CF34-10E2A1, CF34-10E5, CF34-10E5A1, CF34-10E6, CF34-10E6A1, CF34-10E7, and CF34-10E7-B engines equipped with specific high-pressure turbine shroud/low-pressure turbine nozzle assemblies. This directive mandates inspections and rework due to failed retention features of support air ducts discovered during engine disassembly. The AD aims to prevent combustion case failure that could lead to engine separation and potential loss of the airplane.
What changed
This new airworthiness directive introduces a requirement for a visual inspection of the combustion case for wear and gouges, repair if necessary, and rework of affected HPT shroud/LPT nozzle assemblies to add positive retention of the support air duct. It expands applicability to include additional engine models CF34-10E5 and CF34-10E5A1 following comments from stakeholders. The directive incorporates GE Service Bulletin 72-0351 R01 as the compliance method.
Why it matters
This AD is critical for aviation professionals because it addresses a safety risk involving the failure of retention features that can cause damage to the combustion case, compromising engine integrity during extreme events. Operators and maintenance organizations must comply to avoid potential engine separation and ensure continued airworthiness. The directive also provides a pathway for alternative methods of compliance, offering some operational flexibility while maintaining safety standards.
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