The Problem : After performing a shallow turn ( half rate turn, one division on display) of approx 30 degrees or more, on leveling out, HXr horizon displays a turn in the opposite direction.
AHARS is installed behind the display
Magnetometer has been tried:
1: Behind the baggage bulkhead
2: On the shelf area under the vertical fin.
3: Two locations in the wing tip.
Greg of GRT was kind enough to replace both the AHARS and the magnetometer, however, the problem remains. He advised me that during a shallow turn the algorithm used to calculate level is biased to the magnetometer data. It would appear the problem is something to do with the magnetometer.
Have sent DEMO files to GRT, they could not find anything wrong.
This issue dose not occur in smooth air. Makes you think either a loose connection or movement of the magnetometer in its mount, cant detect either.
Wiring between the magnetometer and the AHARS has been tested both for correct pin and resistance, all measured 1.5 ohms, so no loose connections ( wiggled wires ).
Magnetometer calibrates perfectly with only minor deviations displayed during calibration.
Only discrepancy I can find is during recommended testing the Mag X value is 800 when faced north, it should be over 1000.
This problem has been going on for two years, I would be reluctant to fly in IFR with this problem, wondering if anyone else is having the same problem ?
I will be at Airventure if anyone has any thoughts.
Peter
AHARS is installed behind the display
Magnetometer has been tried:
1: Behind the baggage bulkhead
2: On the shelf area under the vertical fin.
3: Two locations in the wing tip.
Greg of GRT was kind enough to replace both the AHARS and the magnetometer, however, the problem remains. He advised me that during a shallow turn the algorithm used to calculate level is biased to the magnetometer data. It would appear the problem is something to do with the magnetometer.
Have sent DEMO files to GRT, they could not find anything wrong.
This issue dose not occur in smooth air. Makes you think either a loose connection or movement of the magnetometer in its mount, cant detect either.
Wiring between the magnetometer and the AHARS has been tested both for correct pin and resistance, all measured 1.5 ohms, so no loose connections ( wiggled wires ).
Magnetometer calibrates perfectly with only minor deviations displayed during calibration.
Only discrepancy I can find is during recommended testing the Mag X value is 800 when faced north, it should be over 1000.
This problem has been going on for two years, I would be reluctant to fly in IFR with this problem, wondering if anyone else is having the same problem ?
I will be at Airventure if anyone has any thoughts.
Peter
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