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  • 8/14/2019 By :-Viral Patel (0943)

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    BLACK BOXBLACK BOX

    By :-Viral Patel (0943)

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    Storage and RecordingStorage and Recording

    Solid state technology Solid state uses stacked arrays ofmemory chips, so they

    don't have moving parts.

    flight data recorder (FDR) and cockpit voice recorder(CVR)

    CVR and FDR is stored on stacked memory boardsinside the crash-survivable memory unit (CSMU).

    the CSMU is a cylindrical compartment on the recorder.

    The stacked memory boards are about 1.75 inches (4.4cm) in diameter and 1 inch (2.54 cm) tall.

    http://electronics.howstuffworks.com/gadgets/other-gadgets/computer-memory.htmhttp://electronics.howstuffworks.com/gadgets/other-gadgets/computer-memory.htm
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    All of the data collected by the airplane's sensors issent to the flight-data acquisition unit (FDAU).

    This device often is found in the electronic equipmentbayunder the cockpit.

    The flight-data acquisition unit is the middle manager

    of the entire data-recording process.

    It takes the information from the sensors and sends iton to the black boxes

    Both black boxes are powered by one of two powergenerators that draw their power from theplane's engines

    http://electronics.howstuffworks.com/gadgets/other-gadgets/turbine.htmhttp://electronics.howstuffworks.com/gadgets/other-gadgets/turbine.htm
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    Flight Data RecordersFlight Data Recorders

    The flight data recorder (FDR) is designed torecord the operating data from the plane's systems.

    There are sensors that are wired from various areas

    on the plane to the flight-data acquisition unit,which is wired to the FDR.

    25 hours of flight data

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    Cockpit Voice RecordersCockpit Voice Recorders There may be up to four microphones in the plane's

    cockpit Pilot's headset Co-pilot's headset Headset of a third crew member Near the center of the cockpit,

    Any sounds in the cockpit are picked up by thesemicrophones and sent to the CVR

    There is also another device in the cockpit, called theassociated control unit, that provides pre-amplification for audio going to the CVR

    accommodate two hours of audio data

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    crash-survivable memory unitscrash-survivable memory units(CSMUs)(CSMUs)

    The CSMU is a large cylinder that bolts onto theflat portion of the recorder.

    This device is engineered to withstand extremeheat, violent crashes and tons of pressure

    Using three layers of materials, the CSMU in asolid-state black box insulates and protectsthe stack of memory boards that store thedigitized information

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    Underwater Locator BeaconUnderwater Locator Beacon

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    Underwater Locator BeaconUnderwater Locator Beacon

    If a plane crashes into the water, this beacon sends out anultrasonic pulse that cannot be heard by human ears butis readily detectable by sonar and acoustical locatingequipment.

    There is a submergence sensor on the side of the beaconthat looks like a bull's-eye.

    When water touches this sensor, it activates the beacon.

    The beacon sends out pulses at 37.5 kilohertz (kHz) and

    can transmit sound as deep as 14,000 feet (4,267 m). Once the beacon begins "pinging," it pings once per second

    for 30 days.

    This beacon is powered by abatterythat has a shelf life of

    six years

    http://electronics.howstuffworks.com/gadgets/other-gadgets/hearing.htmhttp://electronics.howstuffworks.com/gadgets/other-gadgets/battery.htmhttp://electronics.howstuffworks.com/gadgets/other-gadgets/battery.htmhttp://electronics.howstuffworks.com/gadgets/other-gadgets/hearing.htm
  • 8/14/2019 By :-Viral Patel (0943)

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    Retrieving InformationRetrieving Information

    After finding the black boxes, investigators take therecorders to a lab where they can download the datafrom the recorders and attempt to recreate the eventsof the accident.

    This process can take weeks or months to complete Very often, recorders retrieved from wreckage are dented

    or burned. In these cases, the memory boards are removed, cleaned

    up and a new memory interface cable is installed.

    Then the memory board is connected to a workingrecorder.

    This recorder has special software to facilitate theretrieval of data without the possibility of overwritingany of it.

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    PORTABLE INTERFACEPORTABLE INTERFACE

    portable interface can allow investigators quick access to the data on a black box

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    WHAT'S IN STORE FORWHAT'S IN STORE FORBLACK BOXES?BLACK BOXES?

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