"Whenever power is taken off the IRS system, it needs to do a full alignment."
Thanks HS. That's exactly what I needed to know
And now, perhaps, a slightly harder question....
What part of the IRS gives you ATTitude ONLY mode (Are both accelerometers and gyros still required). I find it interesting to know that you can go from OFF to ATT in flight/motion and still get ATTitude. I've done this in real life, but this feature didn't seem to work in the simulators.
Thanks.
Cheers.
Q.