An avionics installer reported an integration failure between a Garmin GI 275 and an S-TEC 3100 autopilot, initially citing a lack of documentation from Garmin and ultimately discovering the cause...

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  "detected_at": "2026-09-10T23:01:37+00:00",
  "company": {
    "name": "Garmin",
    "domain": "garmin.com"
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    "post_id": "1wcyrqv",
    "summary": "An avionics installer reported an integration failure between a Garmin GI 275 and an S-TEC 3100 autopilot, initially citing a lack of documentation from Garmin and ultimately discovering the cause was a 'ghost setting' in the GI 275's configuration that required a full reset to resolve.",
    "category": "implementation",
    "comments": [
      {
        "url": "https://www.reddit.com/r/avionics/comments/1wcyrqv/comment/p926vmx/",
        "depth": 0,
        "score": 3,
        "author": "derekbox",
        "excerpt": "If there is no install guidance the default way to wire it would be probably emulating KI256 and KCS55.\n\n is it a GI275 adahrs+AP\nare there 2 gi275s? are all signals hooked up to the GI275\nwhat config file is loaded to the stec3100? what heading type?\nwhat heading type is the gi275 emulating?\nwhat autopilot was removed? what ADI/HSI was removed?",
        "posted_at": "2026-09-11T00:23:57.000Z",
        "author_url": "https://www.reddit.com/user/derekbox/"
      },
      {
        "url": "https://www.reddit.com/r/avionics/comments/1wcyrqv/comment/p92celt/",
        "depth": 0,
        "score": 2,
        "author": "Zap_Brannigan2",
        "excerpt": "You are missing the heading valid",
        "posted_at": "2026-09-11T00:52:36.000Z",
        "author_url": "https://www.reddit.com/user/Zap_Brannigan2/"
      },
      {
        "url": "https://www.reddit.com/r/avionics/comments/1wcyrqv/comment/p92ly3r/",
        "depth": 0,
        "score": 2,
        "author": "Captain_Flannel",
        "excerpt": "I just got one of these interfaces working a week or two ago. S-TEC does have some configuration data. Is this a new installation or are you trying to fix something?\n\n Feel free to DM me and I can send any of the config data sheets I have.",
        "posted_at": "2026-09-11T01:42:09.000Z",
        "author_url": "https://www.reddit.com/user/Captain_Flannel/"
      }
    ],
    "evidence": [
      "[post] Garmin has nothing on it about the interconnects. Autopilot engages but when HDG is selected there is a failure displayed on the computer and it won’t follow the heading bug on the HSI.",
      "[post] SOLVED. ... We had a ghost setting on the 275 ADI. Config mode setting set correctly but we printed the config log and it was wrong. Cleared config settings and redid the configuration setup. ✅"
    ],
    "virality": "low",
    "post_date": "2026-09-10T23:01:37.000Z",
    "post_kind": "text",
    "post_text": "Garmin has nothing on it about the interconnects. Autopilot engages but when HDG is selected there is a failure displayed on the computer and it won’t follow the heading bug on the HSI. Any ideas?? Wiring is good.\n\nSOLVED.Arinc 429 Tx and Rx ADI to 3100Arinc 429 Tx and Tx HSI to 3100Gyro Emulation King KI256Flight director Arinc 429\n\nWe had a ghost setting on the 275 ADI. Config mode setting set correctly but we printed the config log and it was wrong. Cleared config settings and redid the configuration setup. ✅",
    "sentiment": "negative",
    "subreddit": "avionics",
    "event_date": "2026-09",
    "post_title": "GI 275 interfaced to STEC 3100",
    "prominence": "core",
    "source_url": "https://www.reddit.com/r/avionics/comments/1wcyrqv/gi_275_interfaced_to_stec_3100/",
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    "comments_total": 5,
    "total_comments": 5,
    "other_companies": [
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    "comments_included": 3,
    "products_mentioned": [
      "GI 275"
    ]
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curl https://signals.autobound.ai/v1/signals/076bc859-6087-5482-aba0-1601e50f7bc3 \
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curl -X POST https://signals.autobound.ai/v1/companies/enrich \
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  -H "Content-Type: application/json" \
  -d '{"domain":"garmin.com","limit":20}'