No L 373/4 Official Journal of the European Communities 31.12. 91 COUNCIL REGULATION (EEC) No 3922/91 of 16 December 1991 on the harmonization of technical requirements and administrative procedures in the field of ‘ civil aviation THE COUNCIL OF THE EUROPEAN COMMUNITIES, Having regard to the Treaty establishing the European Economic Community, and in particular Article 84 (2) thereof, Having regard to the proposal from the Commission (1), Having regard to the opinion of the European Parliament (2), Having regard to the opinion of the Economic and Social Committee (3), ' Whereas, as provided for in Article 8a of the Treaty, measures should be adopted with the aim of progressively establishing the internal market over a period expiring on 31 December 1992; whereas the internal market will comprise an area without internal frontiers in which the free movement of goods, persons, services and capital is ensured; Whereas a high general level of safety in civil aviation in Europe should be maintained and current technical requirements and administrative procedures in the Member States should be raised to the highest standard currently attained in the Community; Whereas safety is a key factor in Community air transport; whereas account should be taken of the Convention on International Civil Aviation, signed in Chicago on 7 December 1944, which provides for implementation of the measures necessary to ensure the safe operation of aircraft; Whereas the current restrictions on the transfer of aircraft and aviation products and of certain services in the field of aviation between Member States would cause distortions in the internal market; Whereas the Joint Aviation Authorities (JAA), an associated body of the European Civil Aviation Conference (ECAC), have worked out arrangements to cooperate in (1) OJ No C 270, 26. 10. 1990, p. 3. (2) O No C 267, 14. 10. 1991, p. 154. (3) OJ No C 159, 17. 6. 1991, p. 28. the development and implementation of joint aviation requirements (JARs) in all fields relating to the safety of aircraft and their operation; Whereas, under the common transport policy, technical requirements and administrative procedures relating to the safety of aircraft and their operation should be harmonized on the basis of the JAR codes of the JAA; Whereas the accession of all Member States to the JAA and the participation of the Commission in its proceedings would facilitate such harmonization; Whereas, in order to achieve the Community objectives as regards freedom of movement of persons and products and also as regards the common transport policy, Member States should accept the certification of products and of bodies and persons concerned with the design, manufacture, maintenance and operation of products, without further technical work or evaluation, when the product, organization or person has been certificated in accordance with the common technical requirements and administrative procedures; Whereas safety problems may arise and, in such case, Member States must take all appropriate measures as a matter of urgency; whereas such measures must be duly justified and, where the common technical requirements and administrative procedures present shortcomings, it is for the Commission, exercising its implementing powers, to adopt the necessary amendments; Whereas it is desirable that funding by the Member States of research to improve aviation safety be coordinated to ensure optimum use of resources and to enable the maximum benefit to be achieved; Whereas it is appropriate to empower the Commission, assisted by a committee of experts nominated by the Member States, to make the amendments devoloped by the JAA to the common technical requirements and administrative procedures adopted by the Council,