AEROCERT - Aircraft Environmental Impacts and Certification Criteria
Overview
Background & policy context:
Although the effect of aircraft pollution on the environment has been widely addressed by engine manufacturers achieving reductions in noise and emission levels, the current certification does not give a sufficient basis for assessing impacts on the environment, in particular on airport surroundings.
Objectives:
The study's main aim is to identify gaps or issues to be revised in existing certification procedures related to aircraft emissions. All known, foreseen or possible impacts of aircraft emissions will be outlined in order to specify data requirements for environmental assessment. The evaluation of existing certification procedures against common flight operations and the identification of feasible, effective and economically viable modifications are among the key objectives.
The secondary objective relates to the impact of operational and maintenance procedures to aircraft performance, especially for noise and emissions, with particular focus on the negative effects of engine deterioration during the maintenance cycle. Recommendations will be given on how to keep operational procedures close to defined certification levels.
Methodology:
The project will involve:
- a description of certification procedures and summaries of available data from certification processes;
- survey of typical aircraft/engine configurations with reference to their type certification levels;
- documentation of current flight profiles, including airport ground operations for the above mentioned configurations at representative European airports;
- a literature survey on specific environmental impacts and related parameters that are necessary to calculate descriptor values;
- an assessment of the effects from operational procedures that deviate from given certification standards on noise and engine gas emissions;
- an assessment of the degradation of engine emissions during its service life.
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