This project on the tightening up of noise limits for civil jet aircraft has the objective, based on the insights of a status-quo analysis, of preparing proposals for updating Annex 16 and of undertaking an assessment of proposals for new (more stringent) noise limits, bearing in mind aspects of environmental protection as well as from a technical, legal and economic point of view. Recommendations on the methodical and technical modification of existing rules and regulations as well as on the appropriate scale of further more stringent noise limits are seen as a further development of noisecertification. Knowledge derived from Chapters 2 to 6 of this report provides the basis for this.