MD-11 Initialise IRS problem

[justme 0]

Hello,I have a problem with initialising the IRS on MD-11 at the following situation.- GNS/GPS enabled- only 15 sec alignment time- I forget to use Initialise IRS* in FMC within the required time when setting the IRSs to NAV so the lights of IRUs are flashing. Therefor I switch them back to off then to NAV again to restart the initialising but whatever I do I cannot use Initialise IRS* in FMC because it says NOT ALLOWED. How can I restart the process if I forget to enter the required data within time? It is a bug or I do something wrong?(Of course if I dont forget it the first time it works properly)Matyas Majzik

[Check_Airman 3]

If you need to restart the process, turn them off, count to 10, then set them back to NAV.Paul