Issue between GI-275 ADI and HSI Compass Reading

[Matthew P]

So, out flying and noticed that there is a 46 degree difference between the ADI Compass heading and the HSI Compass heading...The ADI aligns with the RWY heading and Standby Magnetic Compass..so not sure why the disparity between the ADI Compass and HSI Compass. I'm aware of the difference between heading and track, I just used the track bug to show the compass setting to get the difference between the 2.. also, when changing the HSI to ADI the error is still there..

 

 

Any ideas?

 

TIA

Edited January 29 by Matthew P

[Ragsf15e]

1 hour ago, Matthew P said:

So, out flying and noticed that there is a 46 degree difference between the ADI Compass heading and the HSI Compass heading...The ADI aligns with the RWY heading and Standby Magnetic Compass..so not sure why the disparity between the ADI Compass and HSI Compass. I'm aware of the difference between heading and track, I just used the track bug to show the compass setting to get the difference between the 2.. also, when changing the HSI to ADI the error is still there..

 

 

Any ideas?

 

TIA

Is the hsi in track mode (bottom left corner?)?  At zero airspeed, it might not have a good track (since you’re not moving), Id say it needs to be in heading mode?  I think it should be in heading?  Page below shows the symbol im talking about…

[PeterRus]

It's in the track mode -- TRK. 

[Matthew P]

11 hours ago, Ragsf15e said:

Is the hsi in track mode (bottom left corner?)?  At zero airspeed, it might not have a good track (since you’re not moving), Id say it needs to be in heading mode?  I think it should be in heading?  Page below shows the symbol im talking about…

Thanks, 2 questions, regardless of the mode, shouldn't the compass on each of the ADI and HSI be the same and, how do I change it to the heading mode, which would be my preference..

TIA

 

Matt

[Ragsf15e]

1 hour ago, Matthew P said:

Thanks, 2 questions, regardless of the mode, shouldn't the compass on each of the ADI and HSI be the same and, how do I change it to the heading mode, which would be my preference..

TIA

 

Matt

That’s gonna take a read through the pilot’s guide.  I’m sorry, I don’t have GI275s so I’m not exactly sure. I would think that they would both initialize to heading, but there is a way to use GPS track as well. I’m not sure if that indicates a problem or if it’s just set into track?

[Matthew P]

9 minutes ago, Ragsf15e said:

That’s gonna take a read through the pilot’s guide.  I’m sorry, I don’t have GI275s so I’m not exactly sure. I would think that they would both initialize to heading, but there is a way to use GPS track as well. I’m not sure if that indicates a problem or if it’s just set into track?

Thank you for your time...I appreciate it...waiting to hear back from my avionics guy.

 

V/r

matt

[201Mooniac]

A couple of questions, what is the heading source for each unit?  Is it a shared GMU 11 or are you getting data from another PFD which could require some configuration changes?  Also, have you verified the units are talking to each other?  I can't see how the HSI is in track mode unless it isn't getting a Heading which would cause it to revert to track.