by tikibar » Wed Jun 01, 2016 2:47 am
As sanhozay pointed out, the 757 has a form of IRS alignment. It's also in the 747-8 and 767. It doesn't actually simulate an IRS, but it does simulate some of the initialization of the system. In the 747-8, there's a selection in the Control Panel dialog where you can choose your level of realism by setting how long it takes to align (30 sec, 5 min, or 13 min). It's set to 5 min for the 757/767. It doesn't really affect anything in the end except if you fly a route-manager flightplan without aligning the IRS, "IRS ALIGN" appears in orange on the EICAS for your whole flight. It also does a 30-second realignment. In the 757 and 767, it's in Nasal/systems.nas. Look for IRS/INS