Black boxes from Yemenia Airways flight damaged

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Black boxes from Yemenia Airways flight damaged | Photo 02

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{ How far this investigation is true god only knows. Large commercial aircraft are required to carry two separate black boxes or flight recorders – a Cockpit Voice Recorder (CVR) and a Flight Data Recorder (FDR). The term black-box is a misnomer as the flight recorders are actually painted orange to help in their recovery following an accident. Flight recorders are also fitted with a battery-powered sonar transducer to aid in underwater recovery (look for the shiny cylinder attached to the front of the recorder). The data, rather than the whole recorder, must survive the accident so the data storage medium (magnetic tape or microchips) is located within a crash-protected container. The container is designed to survive both high-speed impact and post-impact fire. Flight recorders are not, however, indestructible and sometimes they are destroyed and the data lost. Flight recorders are normally located near the aircraft’s tail since experience has shown that this area generally suffers the least damage during an accident.
Specifications--
Flight Data Recorder
Time recorded   25 hour continuous
Number of parameters 18 - 1000+
Impact tolerance 3400Gs / 6.5 ms
Fire resistance 1100 degC / 30 min
Water pressure resistance submerged 20,000 ft
Underwater locator beacon 37.5 KHz; battery has shelf life of 6 years or more, with 30-day operation capability upon activation.

Cockpit Voice Recorder
Time recorded   30 min continuous, 2 hours for solid state digital units
Number of channels 4
Impact tolerance 3400Gs / 6.5 ms
Fire resistance 1100 degC / 30 min
Water pressure resistance submerged 20,000 ft
Underwater locator beacon 37.5 KHz; battery has shelf life of 6 years or more, with 30-day operation capability upon activation.

With any airplane crash, there are many unanswered questions as to what brought the plane down. Investigators turn to the airplane's flight data recorder (FDR) and cockpit voice recorder (CVR), also known as "black boxes," for answers. But here in case of Yemenia it seems no explanation can be given about the crash since black box and cockpit voice recorders are damaged. Or is it the case like of air France flight 296, where the black box of Airbus that crashed during an air show in France in 1988 was replaced with another after the accident, a report shows. http://www.airdisaster.com/investigations/af296/af296.shtml#blbox }