susan6
Well-Known Member
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I had a similar question. How far can a radar station track a plane? Maybe it was hijacked and the pilots were forced to make a U-turn and then fly "under the radar" to some undisclosed destination.
Yeah, with the new info, this is becoming a bit more likely....apparently the pilots (if forced by a hijacker) can turn off their transponders, which makes the aircraft invisible to civilian radar but it can still be seen by military radar. So maybe it was hijacked and forced to turn around to go somewhere else.
The effect of turning off the transponder is to make the aircraft inert to secondary radar, so civil controllers cannot identify it. Secondary radar interrogates the transponder and gets information about the plane's identity, speed and height. It would however still be visible to primary radar, which is used by militaries.
http://www.slate.com/blogs/the_slat...ells_reuters_that_mh370_was_last_spotted.html
One question....would passengers be able to text or email, would that be picked up anywhere? (Or would the hijackers turn off the wifi or whatever?) Because it sounds like the plane made a drastic change in course, probably under duress (whether mechanical or human-made), and flew in a different direction for at least an hour.