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The aviation industry has seen consistent growth over the past few decades. To maintain its sustainability and competitiveness, it is important to have a comprehensive understanding of the environmental impacts across the entire life cycle of the industry, including materials, processes and resources; manufacturing and production; lifetime services; reuse; end-of-life; and recycling. One important component of aircraft engines, integral rotors known as Blisks, are made of high-value metallic alloys that require complex and resource-intensive manufacturing processes. The purpose of this paper is to assess the ecological and economical impacts generated through Blisk production and thereby identify significant ‘hot-spots’.

This paper focuses on the methodology and approach for conducting a full-scale Blisk life cycle assessment (LCA) based on ISO 14040/44. Unlike previous papers in the European Aerospace Science Network series, which focused on the first two stages of LCA, this publication delves into the “life cycle impact assessment” and “interpretation” stages, providing an overview of the life cycle inventory modeling, impact category selection and presenting preliminary LCA results for the Blisk manufacturing process chain.

The result shows that the milled titanium Blisk has a lower CO₂ footprint than the milled nickel Blisk, which is less than half of the global warming potential (GWP) of the milled nickel Blisk. A main contributor to GWP arises from raw material production. However, no recycling scenarios were included in the analysis, which will be the topic of further investigations.

The originality of this work lies in the detailed ecological assessment of the manufacturing for complex engine components and the derivation of hot spots as well as potential improvements in terms of eco-footprint reduction throughout the products cradle-to-gate cycle. The LCA results serve as a basis for future approaches of process chain optimisation, use of “greener” materials and individual process improvements.

There is a growing consensus in education that schools can and should attend to students’ social-emotional development. Emerging research and popular texts indicate that students’ mindsets, beliefs, dispositions, emotions and behaviors can advance outcomes, such as college readiness, career success, mental health and relationships. Despite this growing awareness, many districts and schools are still struggling to implement strategies that develop students’ social-emotional skills. The purpose of this paper is to fill this gap by examining the social-emotional learning (SEL) practices in ten middle schools with strong student-reported data on SEL outcomes, particularly for African American and Latinx students.

Case study methods, including interviews, observations and document analysis, were employed.

The authors identify six categories of common SEL practices: strategies that promote positive school climate and relationships, supporting positive behavior, use of elective courses and extracurricular activities, SEL-specific classroom practices and curricula, personnel strategies and measurement and data use. Absence of a common definition of SEL and lack of alignment among SEL practices were two challenges cited by respondents.

This is the first study to analyze SEL practices in outlier schools, with a focus on successful practices with schools that have a majority of African American and/or Latinx students.