For which reason ever I got an "IRU No 2 No align" msg at the Engine & saftey warning display and the corresponsing Anu is flashing at the overhead pnl...No 1 is working well.1) What do I have to do now that No 2 is aligning as well? I tried to switch it to "off" and afterwards to "Nav" again...but no change...2) In real world: Is it allowed to take off with only on IRS working (aligned)...?Thanks! :)

1) Have you gone through the alignment process as described in the manual? Should work...2) No - the IRS is still the primary long range navigation system, GPS can only update a drifting IRS position, not supply proper position, track and GS info itself (or at least isn't certified to). Cheers,Niklas

2 ) IRS AUX may be inoperative.