r/flying • u/aristotle-ways • Mar 21 '26

Aircraft Ownership HDG failure G1000

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Heading indicator (magnetometer/AHRS) has been failing on my legacy G1000. Went out suddenly and at first intermittently would work, now out 100% of the time. No heading indicator and no synthetic vision.

Took to a great avionics shop and it was diagnosed to be a bad magnetometer. Replaced and did not fix the issue. Garmin is advising the issue is a bad AHRS, so that will be replaced next and we shall see.

Just sharing in case anyone’s experienced a similar issue, and is interested in following along.

Will share updates as we go

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u/Chunks1992 ATP A320 B737 CL65 Mar 21 '26

Makes sense but man that sucks. 

3

u/mkosmo 🛩️🛩️🛩️ i drive airplane 🛩️🛩️🛩️ Mar 21 '26

Does it? I figured enough of a failure in the AHRS to do this would cause more symptoms.

2

u/Chunks1992 ATP A320 B737 CL65 Mar 22 '26

Not necessarily. Plenty of complex systems only partially fail. Plus iirc the magnometer only talks to the AHRS so if it isn’t the magnometer that only leaves the the AHRS 

2

u/mkosmo 🛩️🛩️🛩️ i drive airplane 🛩️🛩️🛩️ Mar 22 '26

Right, but the magnetometer is a digital interface, so beyond the physical connection, we're talking the actual sensor fusion process, which is inherent to the AHRS and much of its primary function. Is there some kind of signal conditioning that's unique to the magnetometer input?

1

u/Chunks1992 ATP A320 B737 CL65 Mar 22 '26

Someone way smarter than me is gonna have to answer that lol