Originally Posted by 145qrh
If you have GPS primary it really doesn't need to be a full align as it updates itself on application of take-off thrust.
145qrh
A general misunderstanding IMHO about the IRS on the airbus. The GPS updates the FMGCs position (hybrid mix of IRS/GPS) not the IRS...
I'm used to see a 5 NM IRS drift after 2 sectors, short haul though. The reason is the first alignement of the IRS at the ARP while the aircraft stands 1NM away... Wrong SOP to my understanding.
