Pixhawk Not Arming - Unknown Error Tone

Hoping someone can help me out here - my Pixhawk (plane) won't arm and I have not idea what the alarm sound means as it's not in the list of sounds in the Wiki. I also get the message "Bad or no terrain data" and it won't go away like it usually does after a minute or 2.

Here is a link to a video of the issue:




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  • are you trying to ARM indoors?

    do you have GPS 3D lock?

    have you got Pre-Arming turned ON?

    • Hi Muhammad

      I was trying this indoors, but I have a clear polycarb roof covering with good GPS reception.

      GPS lock was good - 3D

      Pre-arming is not on.

      The problem seems to have sorted itself out now - it could have been a loose SD card, but not certain.



    • Alhamdulillah, glad to know it all worked out. Yup, the Pixhawk won't without and SD card :-)

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