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adhars intermittent failure (Read 326 times)
Apr 30th, 2018 at 6:57am

GeorgesGolf   Offline
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France

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I just make my first engine start but not yet flown.
I have 2 skyview touch with 2 adhars (purchased in July 2016) and on one of them sometime the speed bar flicker with a bad indication of speed witch should be 0 in the hangar.
When it happen pitch is slightly wrong also and sometime I get a message VPX fail because skyview think I am in flight without alternator.
It is not a permanent failure but more and more often now.
Any idea?
Thank you
 
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Reply #1 - Apr 30th, 2018 at 7:41am

airguy   Offline
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Have you done the zero-airspeed calibration routine?
 
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Reply #2 - Apr 30th, 2018 at 8:58am

GeorgesGolf   Offline
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Zero airspeed calibration is done.
Speed indicate 0 in the hangar when the 2 adhars work properly.
I suspected a bad electric connection but after changing the plugs the malfunction is always on the adhars 200.
 
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Reply #3 - Apr 30th, 2018 at 2:09pm

Steve W.   Offline
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GeorgesGolf wrote on Apr 30th, 2018 at 8:58am:
Zero airspeed calibration is done.
Speed indicate 0 in the hangar when the 2 adhars work properly.
I suspected a bad electric connection but after changing the plugs the malfunction is always on the adhars 200.


Can you swap the units to see if the failure follows the unit, or stays with the wire?
 
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Reply #4 - Apr 30th, 2018 at 10:46pm

GeorgesGolf   Offline
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I changed the wires between the 2 units and failure stay on the adhars 200.
 
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Reply #5 - May 1st, 2018 at 12:23pm

Steve W.   Offline
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GeorgesGolf wrote on Apr 30th, 2018 at 10:46pm:
I changed the wires between the 2 units and failure stay on the adhars 200.


Did you change the wiring harness at the ADAHRS end?  Or at the EFIS end?
 
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Reply #6 - May 1st, 2018 at 10:12pm

GeorgesGolf   Offline
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At the adahrs end.
Wiring goes from the adahrs to a splitter and from the splitter to the SV-NET-HUB.
 
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