72.128.40.138 (talk) Undid revision 600099419 . It's accurate enough. Add something then. BUT QUIT DELETING IT. |
Undid revision 600105031 by 72.128.40.138 (talk) no, it's not accurate enough |
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The devices are designed not only to survive accidents, but to function correctly after impact. Research by the [[Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile|BEA]] showed that they have had an 90% survival rate spanning 27 air accidents over the sea.<ref>{{cite report|url=http://www.bea.aero/fr/enquetes/vol.af.447/metron.search.analysis.pdf|title=Search Analysis for the Location of the AF447 Underwater Wreckage|page=39|date=2011-02-03|publisher=Metron Scientic Solutions}}</ref> The ULBs fitted in [[Air France Flight 447]], which crashed on 1 June 2009, were certified to transmit on 37.5 kHz for 30 days. Investigating the crash, the BEA recommended that FDR ULBs' transmission period be increased to 90 days and that "airplanes performing public transport flights over maritime areas to be equipped with an additional ULB capable of transmitting on a frequency (for example between 8.5 kHz and 9.5 kHz) and for a duration adapted to the pre-localisation of wreckage" (i.e. with increased range).<ref>{{cite report|title=Interim Report n°2|pages=11, 71, 77|url=http://www.bea.aero/docspa/2009/f-cp090601e2.en/pdf/f-cp090601e2.en.pdf|date=2009-12-17|publisher=Bureau d'Enquêtes et d'Analyses pour la sécurité de l'aviation civile}}</ref> |
The devices are designed not only to survive accidents, but to function correctly after impact. Research by the [[Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile|BEA]] showed that they have had an 90% survival rate spanning 27 air accidents over the sea.<ref>{{cite report|url=http://www.bea.aero/fr/enquetes/vol.af.447/metron.search.analysis.pdf|title=Search Analysis for the Location of the AF447 Underwater Wreckage|page=39|date=2011-02-03|publisher=Metron Scientic Solutions}}</ref> The ULBs fitted in [[Air France Flight 447]], which crashed on 1 June 2009, were certified to transmit on 37.5 kHz for 30 days. Investigating the crash, the BEA recommended that FDR ULBs' transmission period be increased to 90 days and that "airplanes performing public transport flights over maritime areas to be equipped with an additional ULB capable of transmitting on a frequency (for example between 8.5 kHz and 9.5 kHz) and for a duration adapted to the pre-localisation of wreckage" (i.e. with increased range).<ref>{{cite report|title=Interim Report n°2|pages=11, 71, 77|url=http://www.bea.aero/docspa/2009/f-cp090601e2.en/pdf/f-cp090601e2.en.pdf|date=2009-12-17|publisher=Bureau d'Enquêtes et d'Analyses pour la sécurité de l'aviation civile}}</ref> |
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== Range == |
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Maximum detection range is 2-3km <ref>http://www.hydro-international.com/issues/articles/id1130-Deepwater_Black_Box_Retrieval.html Deep-water Black Box Retrieval</ref> |
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==See also== |
==See also== |
Revision as of 02:57, 18 March 2014
An underwater locator beacon (ULB) or underwater acoustic beacon is a device fitted to aviation flight recorders such as the cockpit voice recorder (CVR) and flight data recorder (FDR). ULBs are also sometimes required to be attached directly to an aircraft fuselage. When triggered by water immersion, the ULB emits an ultrasonic pulse of 37.5 kHz at an interval of once per second.[citation needed]
The devices are designed not only to survive accidents, but to function correctly after impact. Research by the BEA showed that they have had an 90% survival rate spanning 27 air accidents over the sea.[1] The ULBs fitted in Air France Flight 447, which crashed on 1 June 2009, were certified to transmit on 37.5 kHz for 30 days. Investigating the crash, the BEA recommended that FDR ULBs' transmission period be increased to 90 days and that "airplanes performing public transport flights over maritime areas to be equipped with an additional ULB capable of transmitting on a frequency (for example between 8.5 kHz and 9.5 kHz) and for a duration adapted to the pre-localisation of wreckage" (i.e. with increased range).[2]
See also
References
- ^ Search Analysis for the Location of the AF447 Underwater Wreckage (PDF) (Report). Metron Scientic Solutions. 2011-02-03. p. 39.
- ^ Interim Report n°2 (PDF) (Report). Bureau d'Enquêtes et d'Analyses pour la sécurité de l'aviation civile. 2009-12-17. pp. 11, 71, 77.
External links
- DK120 Underwater Acoustic Beacon
- Underwater Locator Beacon detection ranges for fuselage encapsulated recorders (FAA 1968 study)
- Deep-water Black Box Retrieval