On 30/05/2011, at 8:18 PM, Mike Borgelt wrote:

> So hopefully when the computers went off line the back up display worked from 
> the gyros and accelerometers? With the quality of the gyros and 
> accelerometers they would be using the attitude display at least ought to 
> work usefully for some minutes at least, without air data inputs.



The ISIS is another electronic system, not a gyro-based steam-gauge
system.

It takes data from the third set of pitot/static probes.

If they're iced over, then the ISIS doesn't work.

  - mark


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