Trouble with Garmin G5 localizer alignment

Discussion in 'Flight Following' started by MJR Pilot, Mar 23, 2021.

  1. MJR Pilot

    MJR Pilot Filing Flight Plan

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    Curious if others with Garmin G5s are having this issue: I currently have dual G5 PFD and HSI set up and Garmin 430W. Have flown a few dozen approaches with no issues. However, I recently flew a couple approaches in VMC where the final approach course displayed by the G5 CDI did not align with the runway. KBDR RNAV 29 - I was perfectly aligned with the runway, but the CDI final approach course indication was a full dot to the left. Same with KAVP ILS 22 - perfect visual alignment with the runway, yet the localizer was a full dot to the left. And this is happening throughout the entire final approach segment - not just on short final. And as I said earlier, for most approaches the CDI has aligned with the runway, but these 2 instances have left me a bit wary of relying on the G5s in low IFR. I'm going to contact Garmin directly, but we all know that can take a while. Curious in the interim if anyone has experienced similar issues or has any thoughts. Thanks as always.
     
  2. eman1200

    eman1200 Touchdown! Greaser!

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  3. MJR Pilot

    MJR Pilot Filing Flight Plan

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    I'm not sure I follow...
     
  4. Piperonca

    Piperonca Pre-takeoff checklist PoA Supporter

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  5. Groundpounder

    Groundpounder Pattern Altitude

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    How much wind was there that day? It can be very easy to think you're not aligned with the runway, but in fact you are due to there being a significant wind correction angle.
     
  6. MJR Pilot

    MJR Pilot Filing Flight Plan

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    Calm wind. I flew the ILS last night - perfectly aligned with the runway visually, but localizer on G5 was a full dot to the left. Had I followed that localizer course and not had visual contact with the runway, I estimate I would have ended up a few hundred feet to the left of the runway once I reached DA. Scary thought.
     
  7. Greg Ellis

    Greg Ellis Filing Flight Plan

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    This happened to me with my old CDI that I had. I understand what you are saying. I would fly an approach in visual conditions and if I aligned myself with the runway the needle would be one to two dots to the left. If I aligned the CDI needle centered then I would be heading off runway centerline and by the end of the approach I would have been well off centerline. Unfortunately I do not have an answer for you since instead of fixing it I upgraded my panel to include a G5 HSI like you have but mine works perfectly. It may need a calibration that Garmin can help you with or there may be an issue with the GMU11 magnetometer.
     
  8. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    This is just how the approach is. A lot of approaches you don’t look super aligned with the runway in VMC.

    It wouldn’t matter if it was a G5, steam gauge, or anything else.
     
  9. Groundpounder

    Groundpounder Pattern Altitude

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    Follow the CDI down to mins and see where you are at that point. If it as far off as you seemed that you were further out, then there is an issue.
     
  10. Shepherd

    Shepherd En-Route

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    Do it with 2 onboard. Once your head comes out of the cockpit you don't want to be switching back and forth.
    You fly the plane to the ground, your copilot records the readings.
     
  11. Plano Pilot

    Plano Pilot Line Up and Wait

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    KAVP Localizer RWY 22 is offset 1.7 degrees to the left from the runway per Jepp.
     
  12. chemgeek

    chemgeek Pattern Altitude

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    I think you are doing this backwards. Fly the CDI and see where you wind up. I don't think you can necessarily tell if you are aligned with the final approach path by looking out the windshield, accounting for approach course alignment and crab angle.

    One thing you can check is your GPS CDI indication against your G5. They should read the same. I'm not sure it's possible for the 430w and G5 to indicate different CDI indications.

    FWIW, my G5s appear to accurately reflect what's on the 430W. LNAV horizontal tolerance us in the low tens of meters.
     
  13. TommyG

    TommyG Pattern Altitude

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    Do you have another Nav/CDI to compare while on final?
     
  14. MJR Pilot

    MJR Pilot Filing Flight Plan

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    Thanks everyone for the thoughts. I am planning to re-fly KAVP ILS 22 in the next couple weeks (in VMC). I'll plan to fly the G5 CDI down to mins and see where I end up. Will also compare this to (1) the 430 CDI and (2) I'll also set up NAV 2 (old steam gauge, but it works) to track the localizer - will check how this compares to the G5 CDI. Will report back. Thanks again.
     
  15. Groundpounder

    Groundpounder Pattern Altitude

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    In aircraft with dual nav receivers and indicators, its good SOP to tune both to whatever approach you are doing as a form of redundancy.
     
  16. MJR Pilot

    MJR Pilot Filing Flight Plan

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    Yes, good point. I normally tune NAV 2 to identify FAF on the localizer course, but thats done easy enough using GPS. Will tune this to localizer going forward.
     
  17. luvflyin

    luvflyin Touchdown! Greaser! PoA Supporter

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    GOV Chart also but they get a little more tweaky, it’s 1.67
     
  18. Jim Carpenter

    Jim Carpenter Pre-takeoff checklist

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    Please don't take this as an insult, but it dawned on me, that 'might' happen if you forget to switch to VLOC mode, thus your CDI would show a GPS derived course instead of the actual localizer signal?
     
  19. MJR Pilot

    MJR Pilot Filing Flight Plan

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    No insult taken :). The CDI was set to VLOC mode. also note this happened to me on KBDR RNAV 24 and CDI was appropriately set to GPS. Will keep the group posted.
     
  20. Jeff767

    Jeff767 Pre-takeoff checklist

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    A 1.7 degree offset localizer will seem way off visually.