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Circular 134
Control of Aircraft Engine Emissions
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CIRCULAR CIRCULAR '134-194 CONTROL OF AIRCRAFT ENGINE EMISSIONS 1977 INTERNATIONAL CIVIL AVIATION ORGANIZATION MONTREAL CANADA Approved by the Secretary General and published under his authority
Published in separate English, French, Spanish and Russian editions by the Inter- national Civil Aviation Organization. All corresporzdence, except orders and sub- scriptions, should be addressed to the Secretary General of ICAO, P.O. Box 400, Succursale Place de 1 'A viation internationale, 1000 Sherbrooke Street West, Montreal, Quebec, Canada H3A 2R2. Orders for this publication should be sent to one of the following addresses, together with the appropriate remittance by bank draft or post office money order in U.S. dollars or the currency of the country in which the order is placed. International Civil Aviation Organization. Attention Distribution Officer, P.O. Box 400, Succursale Place de 1'Aviation internationale, 1000 Sherbrooke Street West, Montreal, Quebec, Canada H3A 2R2 Egypt Arab Republic of. ICAO Representative, Middle East and Eastern African Office, 16 Hassan Sabri, Zamalek, Cairo. France. Reprbsentant de I'OACI, Bureau Europe, 3bis, villa Emile-Bergerat, 92200 Neuillysur-Seine. India. Oxford Book and Stationery Co., Scindia House, New Delhi or 17 Park Street, Calcutta. Japan. Japan Civil Aviation Promotion Foundation, No. 38 Shiba Kotohira-Cho, Minato-Ku, Tokyo. Mexico. Representante de la OACI, Oficina Norteambrica y Caribe, Apartado postal 5-377, Mbxico 5, D.F. Pem. Representante de la OACI, Oficina Sudambrica, Apartado 41 27, Lima. Senegal. ReprCsentant de I'OACI, Bureau Afrique, Boite postale 2356, Dakar. Spain. Libreria de Aeronautics y Astronbutica Sumaas, Desengaiio, 12-30-3, Madrid 13. Sweden. C.E. Fritzes Kungl. Hovbokhandel, Fredsgatan 2, Box 16356, Stockholm 16. Thailand. ICAO Representative, Far East and Pacific Office, P.O. Box 614, Bangkok. Unted Kingdom. Civil Aviation Authority, Printing and Publications Services, Creville House, 37 Gratton Road, Cheltenham, Glos., GL50 2BN. Do you receive the ICAO BULLETIN The ICAO Bulletin contains a concise account of the activities of the Organization as well as articles of interest to the aeronautical world. The Bulletin will also keep you up to date on the latest ICAO publica- tions, their contents, amendments, supplements, corrigenda, and prices. Available in three separate editions English, French and Spanish. Annual subscription U.S.Sl5.00 surface mail U.S.20.00 air mail.
FOREWORD 1. Historical Background The 18th Session of the ICAO Assembly adopted Resolutions which stated ICAO'S position on environmental matters A18-11 and set forth the manner in which the Organization's responsibilities should be carried out A18-12. These Resolutions were brought to the attention of the United Nations Conference on the Environment held in Stockholm in June 1972. The Council of ICAO in December 1971, established a plan of action for the implementation of Resolution A18-12 which included consultation with States and International Organizations on the programme to be pursued by ICAO. This consultation showed that there was a general agreement on the need for ICAO action in a number of areas including that of control of aircraft engine emissions in the vicinity of aerodromes. Consequently in June 1972 the Council approved an Action Programme Regarding the Environment and requested the Air Navigation Commission to pursue the technical aspects thereof, which it did in March 1973. With regard to engine emissions it agreed, among other things, that the Secretariat, with the assistance of a Study Group, should develop international specifications for units and methods of measurement of emissions and should study the need for controlling emissions by means of an engine certification scheme . Initial studies in pursuance of these tasks showed that although in general air quality at aerodromes was not a problem, early action to control engine emissions was desirable if a problem were to be avoided in the future. A certification scheme for the control of aircraft engine emissions has therefore been developed and is contained in this Circular for the guidance of States. Objective The objective of the material in this Circular is to provide guidance to States who are considering introducing emissions control regulations into their national codes. It is also intended to serve as advice to manufacturers on the levels of engine emissions which are likely to be acceptable in the relatively near future. It is published as guidance material as an interim measure until internationally agreed ICAO Standards and Recommended Practices SARPS can be developed to replace it. Although it is only guidance material, it has been written in the format in which ICAO SARPS could be expected to appear when developed in the future. It is believed that the publication of this material will assist the aviation industry in keeping ahead of potential air quality problems in the vicinity of aerodromes. It is also considered that the existence of the material might help remove any need seen by States for unilateral action to control aircraft engine emissions.
ii ICAO Circular 134-AN194 Scope The material contained in this Circular is aimed at the control of aircraft engine emissions in the vicinity of aerodromes. It seeks to achieve this end, in the case of gaseous pollutants, by limiting the amount of pollutant emitted during a reference landing and take-off cycle. To make allowance for the useful output of the engine, the limiting level of pollutant is related to take-off thrust. The material only relates to future production of turbojet and turbofan engines intended for propulsion at subsonic speeds. It is intended to provide material relating to other classes of engine in due course. The present intention is that engines would show compliance with the provisions of the scheme by means of a type-test procedure. However, the validity of this approach cannot be confirmed until further work concerning the variability of measurements between engines of the same type and the effects of in service life on emissions performance has been completed. 4. Use of the Material States may wish to use the material in this Circular as a basis for any national regulations for the control of aircraft engine emissions, pending the develop- ment of ICAO Standards and Recorsmended Practices on the subject.
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