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Thread: AHRS Periodically goes crazy

  1. #21
    Jonathon, actually the AHRS was originally mounted next to the landing gear motor, highly magnetic. See the photo attached of the original mounting. We have tried every place where the current cable will reach. Definitely won't reach the inner wing. Can an extension cable be used?Name:  Original_Mount_Behind_Pilot.jpg
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    You can see the wraps of white cable which we unwrap to locate it on the spar.

  2. #22
    The cable is shielded, if you extend it will be best to use another four conductor shielded cable, and tie the shields together. If that opens up an avenue to get it mounted inboard inside the wing, give it a whirl. Can't be worse than where you have it mounted now.

  3. #23
    Jonathon, where can I order a cable extension? Can I order from AFS? If so do you have a part number?

  4. #24
    We don't have any such part number, or part. You can build an extension cable with a pair of DB9 connectors to plug in series between the existing cable, you can chop the existing wire downsteam of the connector and extend it with new wire and solder sleeves, there are any number of ways to skin the cat here.

    We could provide a cable if you require. If so, we would greatly prefer to just provide a whole new cable all the way from the EFIS, with new pins to insert into the EFIS DB25 connector, and a new DB9 connector for the AHRS side. If you would like to proceed with that, get a measurement for how long the cable should be, and give us a call at 503-263-0037.

  5. #25
    Jonathan, thanks for the reply. We will decide on a course of action.

  6. #26
    After stability for most of the year, the EFIS horizon and compass heading went crazy on a flight today and made it hard to find the airport. We have to do something to fix this. I will call 503-263-0037.

  7. #27
    Just wanted to finish this thread with how we solved our problems. We took Jonathon's advice and replaced the old AHRS with a new SV-ADAHRS-200 with a new SkyView network cable. It took a little bit of modification of the current connector pins but that took no more than about an hour of work. We found that mounting the ADAHRS on the roof of the nose of the SeaRey, just behind the access port gave an adequate location for the gyros and ideal for the magnetic compass. For the first time, we have an accurate compass, which allows the crosswind calculations to be accurate as well as obstacles on the EFIS to show up where they really are, instead of the opposite side of the airplane. There was none of the momentary 'crazy' behavior we had previously as the artificial horizon was absolutely stable for our trip from Minnesota to Florida. Worth the cost and effort to install.

    Jonathon was also very helpful with phone support while we worked through our installation questions.

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