Originally Posted by
EXDAC
Why does this heading drift render PFD2 useless? Is it not possible to source PFD2 heading from side 1 IRS?
I don't know this system so can't comment on drift rate. Have you asked Pilatus or Honeywell?
Hi EXDAC,
Well, there is no use in having a PFD 2 with a heading discrepancy of more than 10 degrees within a couple of minutes of a sync, in darkness and full IMC.
But perhaps I was not clear enough in my description.
Yes, you can source the PFD2 heading from the PFD1 IRS, but its not a constant sync, its a momentary sync. Once you have pressed Sync, the gyro immediately starts to drift with around 1-2degrees / min.
That's why I was asking if anyone had knowledge about what a normal passive drift rate of a AHRS gyro is.
I will bring it up with Pilatus.
Thanks guys.