EASA AD US-2020-08-04
Engine - Low Pressure Turbine Stage 3 Blades - Replacement
Summary
The Federal Aviation Administration Airworthiness Directive 2020-08-04 is a final rule addressing certain International Aero Engines LLC PW1100G-JM series turbofan engines. It specifically targets engines with low-pressure turbine (LPT) 3rd-stage blades, part numbers 5387343, 5387493, 5387473, or 5387503, due to reported blade failures. This directive mandates replacement of the affected blades to ensure continued airworthiness and safety.
What Changed
This new airworthiness directive introduces mandatory replacement of the affected LPT 3rd-stage blades on specified IAE PW1100G-JM series engines. It clarifies applicability by excluding engines covered under a previous AD 2019-25-01 and defines compliance requirements without calendar time but at the next engine shop visit. The directive also addresses public comments and confirms the definition of an engine shop visit consistent with manufacturer service bulletins.
Why It Matters
This directive is critical for aviation professionals as it prevents potential uncontained failures of LPT 3rd-stage blades, which could lead to engine failure and loss of thrust control. Operators and maintenance organizations must comply to maintain safety and regulatory compliance. Understanding the specific affected engine models and blade part numbers helps focus maintenance efforts and avoid unnecessary inspections or replacements.
What To Do
Operators of affected IAE PW1100G-JM series engines must replace the specified LPT 3rd-stage blades at the next engine shop visit after May 21, 2020. They should verify that engines are not excluded by AD 2019-25-01 before proceeding. Maintenance teams should follow Pratt & Whitney Service Bulletin PW1000G-C-72-00-0111-00A-930A-D for removal and replacement procedures.
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