On 3/12/2014 11:24 AM, Tamas Rudnai wrote: >> Writing this to this list as I know quite few of you have knowledge on a= viation. I am just thinking how could the most sophisticated airliner just = disappear in thin air? Ground control use radar and beacons as they trust i= n these much better than any other positioning devices, I get that. Over the oceans, radar coverage is not available ,generally is line of=20 sight from station. Some planes report home with operational info to aid=20 in prompt repair of equipment issues. Likely just pulling a main circuit=20 breaker or 2 would shut down all this stuff. And then there was an=20 Airbus not long ago, the Pitot tube (air speed sensor) that iced over,=20 even our little home built had a heater on it. Gave incorrect airspeed=20 to all systems, pilot flew too slow, no warning, just wing stalled and=20 went straight down, quickly. >> I also totally understand that the plane was flying in an area that wa= s uncovered by radar - at least by commercial radars. But the most modern a= irliner has no GPS at all on board? Or they do have but just could not send= back the position to the ground control? Pilot incapacitated, maybe not voluntarily (I'll leave the=20 interpretation to you) Fire in equipment bay, all sorts of mechanical=20 guesses. :( Wouldn't surprise me they never find it. It took quite a while to=20 actually locate the one that went in the Atlantic off Long Island, Ny.=20 And people saw that one. >> >> Tamas >> >> Sent from my iPad --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .