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Reducing the impact on the environment and the associated commercial implications are two major challenges that the global commercial aviation industry is addressing with significant commitment today. In this respect, Clean Sky, which is a €1.6 billion Joint Technology Initiative part funded by the European Commission is the largest ever programme addressing the greening of air transportation in response to the Advisory Council for Aeronautics Research in Europe (ACARE) goals of reducing CO2 and perceived noise emissions by 50% and NOx by 80% by 2020 compared to 2000 condition. This paper presents research work carried out within the Systems for Green Operations Integrated Technology Demonstrator (ITD) of Clean Sky that is associated with GATAC, a trajectory and route planning tool to enable the multi-objective optimization of flight trajectories and missions. The design and operational methodology of the tool, the optimization algorithms and models are discussed and the results of a preliminary application for a long-range commercial flight are presented.

A study on the environment impact of civil narrow body turboprop aircraft was performed. Main target of this study is to investigate whether the turboprop is an environmental friendly power substitution for turbofan to power the civil narrow body aircraft through flight performance simulation in typical routes. The study was based on the utilization of three codes, aircraft performance model 'APM' ,gas turbine performance model 'TURBOMATCH', emission prediction tool 'HEPHAESTUS', developed by Cranfield University, UK. Results show, the substitution of turbofan with turboprop can reduce the total fuel burn. But this benefit reduces from 18.9% to 6.5% with the increase of the flight range from 650km to 4000km due to stronger and stronger time penalty from 23% to 37%. In addition, this substitution can also reduce around 80% NO x emission, while the reduction of CO 2 emission is proportional to the reduction of fuel burn.

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