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daily 03/14/2014

    • The short answer is yes—there are several airports long enough to land a Boeing 777. But doing so covertly would probably require the complicity of the Indian armed forces (or perhaps those of Myanmar), which makes it extremely unlikely.
    • In a nutshell, this method used a plank of wood (usually wedge shaped and weighted on one end so it would float perpendicular to the water to increase drag) tied to a long thin line that had knots tied at evenly spaced intervals.
    • More pertinently, this is equal to 1/60th a degree of latitude or longitude or one minute of arc (assuming the Earth is a perfect sphere, which it’s not -being squashed at the poles and bulging in the middle -but this is a good enough approximation). Thus, if you were traveling at one knot, it would take you approximately 60 hours to go 1 degree of longitude or latitude.
    • “We are very concerned,” a State Department official told the Times. “This is the second time inside of a month that Russia has chosen to mass large amounts of force on short notice without much transparency around the eastern borders of Ukraine. It certainly creates an environment of intimidation.”
    • Administration and the National Transportation Safety Board have concluded that pings sent to a satellite hours after the plane’s last transponder signal likely came from the missing aircraft, the official said.
    • Malaysian authorities believe they have several “pings” from the airliner’s service data system, known as ACARS, transmitted to satellites in the four to five hours after the last transponder signal, suggesting the plane is believed to have flown to the Indian Ocean, a senior U.S. official told CNN. That information combined with known radar data and knowledge of fuel range leads officials to believe the plane may have made it to that ocean, which is in the opposite direction of the plane’s original route.
    • And there’s another confusing twist. An emergency beacon that would have sent data if the plane was about to impact the ocean apparently did not go off, the official said. The beacons, known as Emergency Locator Transmitters, activate automatically upon immersion in fresh or salt water, but must remain on the surface for a distress signal to transmit.
    • GPS satellites send signals. GPS devices on the ground are entirely passive and only listen for a very faint signal coming out of the sky.

       

      Here’s an article that gives at least one reason why black boxes don’t phone home. http://goo.gl/ItAiOZ

Posted from Diigo. The rest of my favorite links are here.

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