CAO FLIGHT RECORDERS Approved by the Secretary General andpublished under his authority FIRST EDITION - 1973 INTERNATIONAL CIVIL AVIATION ORGANIZATION MONTREAL CANADA
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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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