'Contact lost' with Malaysia Airlines plane

If the transponder is so vital to aircraft operation and general tracking, why does the pilot have the ability to 'turn it off'? Seems a bit of a flaw.
 
Assuming this hasn't been posted !

Found it

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If the transponder is so vital to aircraft operation and general tracking, why does the pilot have the ability to 'turn it off'? Seems a bit of a flaw.

They turn them off when on the ground, as they are un-needed, and create confusion for controllers with ground radar. If every aircraft on the ground had them turned on, it would be very busy on the screens.

I see this all the time when I watch aircraft with ADS-B transponders. As soon as they turn off the runway, they soon disappear from my screen.
 
They turn them off when on the ground, as they are un-needed, and create confusion for controllers with ground radar. If every aircraft on the ground had them turned on, it would be very busy on the screens.

I see this all the time when I watch aircraft with ADS-B transponders. As soon as they turn off the runway, they soon disappear from my screen.

Well in that case, let me rephrase :p

Why can they turn them off in flight?
 
They turn them off when on the ground, as they are un-needed, and create confusion for controllers with ground radar. If every aircraft on the ground had them turned on, it would be very busy on the screens.

I see this all the time when I watch aircraft with ADS-B transponders. As soon as they turn off the runway, they soon disappear from my screen.

Don't they also have the ability to turn virtually any electric system off for fault finding and fire prevention type reasons.
 
Well in that case, let me rephrase :p

Why can they turn them off in flight?

This has been answered repeatedly and isn't a difficult question. Pretty much everything can be turned on or off by the pilots in case of a malfunction of some kind. This is, on balance, a good thing.
 
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