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Wind direction and speedConsidered together as a group, the IRU’scomprise the Inertial Reference System.

Latitude and longitude information to allinstruments and systems requiringinertial data.Each IRU uses laser gyroaccelerometers to provide: This will give you ATTitude information to your PFD.The following information comes directly from the PMDG 747 manual, specifically chapter 7, Cockpit overview, page 5:Inertial Reference System The 747-400 has three Inertial ReferenceUnits, or IRUs. That being said, the only thing that you can do is turn one (or all three if you want) to the ATT setting. As Dan stated the plane needs to be stationary (with the parking break on to make sure the plane doesnt move) to properly align.

Unfortunately, If the FMS looses IRS information while in flight, you will not be able to align the IRU's.