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Circular 112
Flight Recorders
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CAO FLIGHT RECORDERS Approved by the Secretary General andpublished under his authority FIRST EDITION - 1973 INTERNATIONAL CIVIL AVIATION ORGANIZATION MONTREAL CANADA
Published in separate English, French and Spanish editions by the International Civil Aviation Organization. All correspondence, except orders and subscriptions, should be addressed to the Secretary General of ICA 0, International A via tion Building. 1080 University Street, Montreal 101, Quebec, Chnada. 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 or in a freely convertible currency Canada Information Canada, Ottawa, On- Mexico Representante de la OACI, Oficina tario. NorteamCrica y Caribe, Apartado postal 5-377, Mexico 5, D.F. Egypt Arab Republic of ICAO Represen- tative, Middle East and Eastern African Peru Representante de la OACI, Oficina Office, 16 Hassan Sabri, Zamalek, Cairo. Sudamkrica, Apartado 4 127, Lima. France Representant de I'OACI, Bureau Europe, 3bis, villa Emile-Bergerat, 92 Neuilly- sur-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. Senegal Representant de I'OACI, Bureau Afrique, Boite postale 2356, Dakar. 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. United Kingdom Her Majesty's Stationery Office, P.O. Box 569, London, S.E. 1. International Civil Aviation Organization Attention Distribution Officer, International Aviation Building, 1080 University Street, Montreal 10 1, Quebec, Canada. 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 aero- nautical world. The Bulletin will also keep you up to date on the latest lCAO publications, their contents, amendments, supplements, corri- genda, and prices. Available in three separate editions English, French and Spanish. Annual subscription U.S. 9.00 surface mail US. 17.00 air mail.
1. Flight Recorder is defined in Annex 6 Part I as Any type of recorder installed in the aircraft for the purpose of complementing accidentlincident investigation. 2. The Seventh Air Navigation Conference Montreal 5-28 April 1972 reviewed, under Agenda Item 8, the developments in flight recorder sys terns and the experience gained with the use of such equipment since the matter was discussed at the Fourth Air Navigation Conference in 1965, with a view to up-dating the specifications contained in Annex 6 Part I. The Conference was unanimous in its opinion that the experience gained over recent years firom the use of the basic five parameter flight data recorder for the purpose of accident and incident investigation, coupled with the development of more advanced recording tech- niques, justified proposals for more comprehensive flight data recorders. Similarly, the experience gained by those States which had required the carriage of cockpit voice recorders in aeroplanes justified the introduction of appropriate specifications in Annex 6 Part I. 3. As there is more than one satisfactory method of recording information to achieve the fundamental objectives of accident investigation it was agreed that if the basic objectives to be met by a flight recorder system could be specified, this would leave freedom of action to States to decide how these objectives would be achieved. 4. Additionally in relation to parameters, data sources, recording intervals, calibration, levels of crash protection, maintenance and associated matters, it was agreed that the detail involved was generally outside the scope of ICAO specifications but it would be desirable to circulate guidance material to States. 5. The basic objectives to be met by a flight recorder system are now specified in Amendment No. 5 to Annex 6 Part I Chapter 6, 6.3 which, if not disapproved will become applicable on 23 May 1974. The implementation date for the carriage of cockpit voice recorders, and flight data recorders capable of recording more than the five basic para- meters, is 1 January 1975. 6. This Circular is intended to provide guidance as to how some States are achieving the basic objectives to be met by a flight recorder sys tem. It presents the material which was received from some States known to have produced or which are in the process of deve- loping specifications. It will be noted in the introductory comments following the nanrc of the State that in most cases the regulations, as reproduced, are being revised and do not constitute the final version of the national regulations. 7. The Seventh Air Navigation Conference also examined developments related to underwater locating devices to be associated with the installation of flight recorders, flight recorder crash location beacons distinct from aircraft crash location beacons fnB/ , and devices to automatically separate flight recorders from the aircraft structure. It was agreed that there was insufficient experience at this time to warrant the drafting of international specifications but that guidance material could be of benefit to States. Such material has been included in this Circular. 8. Additional material covering flight recorders and their use in accident and incident investigation can be found in the Manual of Aircraft Accident Investigation Doc 6920- A/855/4 Part I11 Chapter 4, and Appendices 3 and 4. See Report of the Seventh Air Navigation Conference DOC 9004-AN/CONF/ 7 .
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