Garmin G500 AHRS Failure

Discussion in 'Avionics and Upgrades' started by jdfrey1, Sep 29, 2019.

  1. jdfrey1

    jdfrey1 Pre-Flight

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    Jeff Frey
    I'm going to post this on a few forums as I'm trying to find ideas on what could be the issue. I'm having an issue in my Saratoga that just after rotation I get an ATTITUDE FAIL message. My shop checked all connections and there weren't any issues. The suggested I capture video of the LRU status page when the issue occurs which I've done in the attached video. They have spoken with Garmin and are saying that it may be the AHRS unit but we are hesitant to replace it until we know for sure. If anyone has any suggestions please let me know.

    Here is the sequence of events and some things that were observed.

    1) For a very brief instance just after rotation the screen flashed "CHECK ATTITUDE". This happened so quickly that I didn't even notice it until I reviewed the video. Another thing I notice is that the wind box on the left side changed to "NO WIND DATA".

    2) The big red X and "ATTITUDE FAIL" message came up but all other information on the PFD looks okay

    3) A few seconds later on the LRU Status page both the GMU and GRS had and X on status. This was only for a couple of seconds and then I received the AHRS ALIGN - Keep Wings Level message.

    4) There was an advisory so I went to the alerts page. Initially it showed the HDG LOST message. Very quickly and just before everything was normal again notice that three GAD43 messages. I'm not sure if this happened as a result of the failure or as the cause of the failure.

    Hopefully this is enough information to isolate the issue. I put the plane back in my hangar as I thought you might need to do some research and order parts. After you review please give me a call and we can discuss the plan.

    Here are the 2 videos taken showing the problem occur.

    - I think this is the better video and here are some screenshots of the key points that I identified above.
     

    Attached Files:

  2. FORANE

    FORANE Pattern Altitude

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    Would a loaner replacement LRU be an option for troubleshooting? Does G offer that option or are you expected to buy another LRU?
     
  3. jdfrey1

    jdfrey1 Pre-Flight

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    I was wondering the same thing and asked my shop this. It sounds like there is an issue with re-certification that if we use something in my plane as a loaner then it would need to be re-certified by Garmin if it wasn't the issue and needed to be replaced. I don't mind trying replacement parts but don't want to buy them if we aren't sure that is the culprit.
     
  4. flyingcheesehead

    flyingcheesehead Touchdown! Greaser!

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    This sounds similar to something I heard over at BeechTalk months ago, when the G500 TXi was fairly new.

    I think it might have been related to the panel having shock mounts - IIRC the G500 TXi must be in a hard-mounted panel unless it's an upgrade from the original G500 or had the AHRS remotely mounted for some other reason. But, it's worth searching BeechTalk for the issue.
     
  5. bnt83

    bnt83 Final Approach PoA Supporter

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    In aviation parts business "loaner" almost always means lease/rent... Especially for high-end avionics.
     
  6. hindsight2020

    hindsight2020 En-Route

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    what's the rental rate on a garmin LRU? What a ridiculous hobby...