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ahrs magnetic anomaly. Check installation

Ulysse

By Ulysse
in Avionics/Panel Discussion

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Marc_B Experienced

Marc_B

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From what I understand it's an issue with a magnetic anomaly with the magnetometer.  Could be install location, wiring passing around the GMU11, or other external magnetic issue.  I've gotten this from time to time with my install and waiting for my shop to check it out.  Do you get this in the air or only on the ground?  Any common denominators when it happens (i.e. turning on lights, flaps, gear, etc.)?  Also, where is your magnetometer mounted?  Mine's in the left wing.

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Ulysse Collaborator

Ulysse

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On 6/3/2023 at 2:13 PM, LANCECASPER said:

near your magnetometer or wiring?

Strangely, it happened repeatedly on a 4h flight on Thursday. On subsequent flights on Friday and today, respectively 2h and 4h long, it never appeared. Could it be the influence of the content of the baggage area?

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Fly Boomer Grand Master

Fly Boomer

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7 hours ago, Ulysse said:

Follow up on this topic:

It seems that the problem has been solved by moving a small toolbox containing one screwdriver and a spanner from one side of the hatrack to the other!

I hope your problem never returns, but I'm suspicious of the "fix".  If it were mine, I would probably continue to pursue the cause.  I guess the current fad is to call it the "root cause".

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Ulysse Collaborator

Ulysse

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On 6/29/2023 at 3:07 PM, Fly Boomer said:

I'm suspicious of the "fix".

It happened again for no apparent reason. I was in IMC, the gfc500 went crazy, the g3x heading and attitude display made no sense and this is the moment where you wish you had a good old gyro.

I canceled my flight and landed. Moved some stuff in the bagage compartment and the hatrack (my magnetometer is behind). Made a test flight. It happened again for a very short moment but the rest of the flight was fine.

Any suggestion on how to handle this problem?

 

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takair Grand Master

takair

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5 hours ago, Ulysse said:

It happened again for no apparent reason. I was in IMC, the gfc500 went crazy, the g3x heading and attitude display made no sense and this is the moment where you wish you had a good old gyro.

I canceled my flight and landed. Moved some stuff in the bagage compartment and the hatrack (my magnetometer is behind). Made a test flight. It happened again for a very short moment but the rest of the flight was fine.

Any suggestion on how to handle this problem?

 

Perhaps try to remove everything from the hat rack and baggage area to eliminate that as a cause. You may have an intermittent wiring or bonding issue that causes it. Might need deeper troubleshooting. Be sure it is not a delayed response to radio transmissions  on certain frequencies too. 

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