On 18/08/2016 12:17 PM, Simon Hackett wrote:
One of those rare times that I pipe up on something here these days.

Here’s evidence of such a double failure in recent times, due to neither of 
your scenarios, in a real aircraft with a lot of internal redundancy:

http://www.bushflyingdiaries.com/2013/10/double-gps-system-failure.html

And deliberate disabling like this:

https://www.faasafety.gov/files/notices/2016/Jun/CHLK_16-08_GPS_Flight_Advisory.pdf

(And as an aside notice the bit at the bottom about the Phenom 300 flight stability being dependent on a functional GPS system....)

--
Justin

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