Malaysia Airlines Flight 370--turning off the transponder helped it disappear.
Bruce
There's no proof it was turned off. It stopped responding, yes. But no proof it was turned off. Give the pilot the benefit of the doubt that some electrical catastrophe (fire) took it out until proven otherwise.
Here's a link to a very sensible theory of what happened, and I'm inclined to believe it more than anything else, again, until proven otherwise.
https://www.wired.com/2014/03/mh370-electrical-fire/
As it was explained to me, there's two different radar systems in use. One can see almost all airplanes and determine distance and heading, but it can't determine altitude. The other sends out a signal that transponders recognize. When the transponder detects that second type of radar, it squawks (returns) a number that the pilot was instructed to squawk. Air traffic control keeps track of the altitude they told you to fly at. So, if your have a transponder, and they tell you to squawk 1234, and fly at 10,000 feet, that's how they "best guess" your actual altitude. They are essentially trusting you to fly at the altitude they told you to, but don't really have a great way to verify that you are, indeed, actually at that assigned altitude. Sleep well on that.... :laughing:
Here's a link that explains it better ....
Transponder (aeronautics) - Wikipedia
I consider myself a realist, not clouded by emotions. The pilot crashed that plane. No argument intended. Just stating my opinion.
It looks like the secondary transponder often broadcasts the planes pressure altitude, so with a working transponder and no monkeying around, then the ground station will have a measured altitude to read.
Point taken though: Z is harder to measure confidently than X, Y.
Rgds, D.
I have better than a clue. I have facts, which I have cited twice.
You, on the other hand, have nothing more than an uninformed and incorrect opinion.