Gentelman,
I know all this. But our boss says if we do a full allignment (which is procedure for long range flights) we should switch off the IRS for 10 minutes to save livetime or whatever. But I can not see the point, as in todays IRS there is no moving parts and they do not need a certain time to spool down and come to a full stop like old gyros did need. I also could not find any recommendations in the maintanance manuals nor the flight manulas (manuls for pilots usually don't tell much more than how to switch on and off).
So I hope my question could be answered by an avionics engineer/expert, as there is probably some more know how behind this issue.
For example all Airbuses are designed, to take off with bleed air on. But most airlines require their pilots to T/O with bleed off in order to save live time. It is
true that Airbus has established procedures for T/O with packs off, but the to not force you in that direction as they whant to sell you new engines after a couple of years.
Cheerz