EASA AD US-2018-07-05
Engine - Low-Pressure Turbine Stage 3 Nozzles - Replacement
Summary
The Federal Aviation Administration's Airworthiness Directive 2018-07-05 addresses General Electric Company CF6-80A, -80A1, -80A2, and -80A3 turbofan engines. It mandates the replacement of low-pressure turbine (LPT) stage 3 nozzles, part numbers 9290M52P05 and 9290M52P06, due to high cycle fatigue cracking. This directive aims to prevent potential LPT uncontainment and associated engine and aircraft damage.
What Changed
This new airworthiness directive introduces a mandatory replacement requirement for the LPT stage 3 nozzles on affected GE CF6-80A series engines. It establishes a compliance timeline allowing replacement within 36 months or at the next engine shop visit, whichever occurs later. The directive also clarifies the definition of an engine shop visit for compliance purposes.
Why It Matters
This directive is critical for aviation professionals as it addresses a safety risk caused by fatigue cracking that could lead to engine uncontainment events. Operators and maintenance organizations must ensure timely nozzle replacement to maintain engine integrity and comply with FAA regulations. Failure to comply could result in unsafe operating conditions and regulatory penalties.
What To Do
Operators of aircraft with GE CF6-80A, -80A1, -80A2, and -80A3 engines must replace the LPT stage 3 nozzles, part numbers 9290M52P05 and 9290M52P06, with eligible parts. This replacement must occur within 36 months of May 11, 2018, or during the next engine shop visit after that date, whichever is later. Maintenance teams should refer to GE Service Bulletin 72-0749, Revision 2, for replacement procedures.
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