IRS TTN?

[daan_vb]

Hello,

I read in the manual that you can see the time its going to take for IRS's to align but I can't seem to find it in the plane?

The quote from the manual:

The duration of the alignment process depends on aircraft latitude. It varies from 2.5 minutes at the equator to 15 minutes at latitudes greater than 70°. The time to completion of alignment is known as ‘time to NAV’ mode (TTN).

TTN can be seen on the IRS sub-section of the NMS or FMS. TTN values greater than 7 minutes are shown as 7
minutes. When alignment is complete, TTN will be shown as 0.0 and an IRS NAV READY message will be given.

Where can I find this? Also what is the NMS?

Thanks

[Spurious]

Yes, I've noticed this in the manual too; I spent far too long looking through pages in the FMS trying to find it. Error in the manual maybe?

Maybe one for @Martyn , a time to IRS align counter in the EFB perhaps?

[Martyn]

In the upcoming v1.1 update, tooltips have been added to the IRS MSU alignment knobs to show the seconds left until alignment.

[Rhinozherous]

@Martyn Cool, thank you!