Engine - High Pressure Turbine Stage 2 Air Seal Assembly - Inspection / Replacement
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Pratt & Whitney PW2037, PW2037M, PW2040, and F117-PW-100 engines must perform fluorescent penetrant and visual inspections of the HPT 2nd-stage air seal assembly as specified. If cracks or defects are found, the assembly must be replaced with a part eligible for installation. Additionally, the affected air seal assembly must be replaced at the next engine shop visit or piece-part opportunity. Compliance with this directive is required by September 1, 2021.
Summary
Airworthiness Directive 2021-14-13 is a final rule issued by the FAA addressing Pratt & Whitney PW2037, PW2037M, PW2040, and F117-PW-100 turbofan engines. It mandates inspections and potential replacement of the high-pressure turbine (HPT) 2nd-stage air seal assembly due to risks of cracks that could lead to uncontained engine failure. This directive aims to ensure continued airworthiness and safety of affected engines.
What changed
This new airworthiness directive introduces mandatory fluorescent penetrant inspections and visual inspections of the HPT 2nd-stage air seal assembly. Depending on inspection results, the affected part must be replaced with an eligible part. The directive also requires replacement of the air seal assembly at the next engine shop visit or piece-part opportunity, removing previously proposed borescope inspection requirements.
Why it matters
This directive is critical for aviation professionals as it addresses a serious unsafe condition that could cause uncontained engine failure, posing safety risks. Operators and maintenance organizations must comply to prevent in-service engine failures and ensure regulatory compliance. The inspections and replacements will impact maintenance scheduling and resource allocation for affected fleets.
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- EASA AD US-2018-14-10Fuel Control Turbine Engines - Electronic Engine Control Software - InstallationSep 25, 2018
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