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Old 06-28-2017, 03:22 PM
woodsideraff woodsideraff is offline
 
Join Date: Aug 2007
Location: Aiken, SC
Posts: 121
Default magnetometer magnetic anomaly warning

We have the GMU 22 magnetometer mounted in the left wing per Vans' specifications.

At first, we couldn't pass the magnetometer interference tests for landing light and strobes. This issue was resolved by bringing the ground return from both landing light and nav/strobes back to the fuselage, thus eliminating the currents through the aluminum fuselage.

However, we are still getting a warning signal on the display: "AHARS 1 magnetic anomaly - check installation". I suspect there are still some stray fields generated by the electrical equipment in the wing.

I believe this to be more of a nuisance than actual magnetometer failure, since the mag heading indications don't seem to be affected.

Has anyone else observed this behavior?
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  #2  
Old 06-28-2017, 03:44 PM
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Pat Hatch Pat Hatch is offline
 
Join Date: Jun 2006
Location: Vero Beach, FL
Posts: 762
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Our issue with the GMU 22 in the wingtip was with the ailerons, specifically the galvanized pipe in the leading edge of the ailerons. We had to move the magnetometer forward slightly beyond mid cord to eliminate the interference warnings, which we would only get in a turn, presumably when the aileron would move. It's fine now once we found the sweet spot. All of our lights are grounded back at the fuselage ground bus.

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  #3  
Old 06-28-2017, 08:11 PM
KeithB KeithB is offline
 
Join Date: Mar 2014
Location: Granbury, TX
Posts: 87
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This thread might help:
http://www.vansairforce.com/communit...ighlight=Gmu22
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RV-14A Builder - kit #136
N314KC - First flight Mar 8, 2017, Phase I compl Apr 3, 2017
RV-6A sold
Sport Pilot (weight-shift control) - Airborne XT912
Dues paid 12/2016
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  #4  
Old 06-28-2017, 08:13 PM
KeithB KeithB is offline
 
Join Date: Mar 2014
Location: Granbury, TX
Posts: 87
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And watch out for pitot heat wiring:
http://www.vansairforce.com/communit...t+magnetometer
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Keith Brown

RV-14A Builder - kit #136
N314KC - First flight Mar 8, 2017, Phase I compl Apr 3, 2017
RV-6A sold
Sport Pilot (weight-shift control) - Airborne XT912
Dues paid 12/2016
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