Garmin 175 as a position source.

Discussion in 'Avionics and Upgrades' started by Bacho, Aug 13, 2019.

  1. Bacho

    Bacho Pre-Flight

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    I am a new owner of a 172G, I am exploring my ADS-B options as well as considering an IFR GPS. So far I have not found the 175 as an approved position source for an ADS-B transponder. Is there something I am missing?
     
  2. denverpilot

    denverpilot Taxi to Parking

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    There is a minimum TSO they have to meet.
     
  3. WannFly

    WannFly En-Route

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    combine the 2 and get a 375
     
  4. Bacho

    Bacho Pre-Flight

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    Ok, so this list is exclusive correct?
     

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  5. denverpilot

    denverpilot Taxi to Parking

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    Its not the complete list of GPS sources that would qualify but probably the most common you’d see in a GA fleet.

    Also certainly up to the manufacturer of the device receiving the GPS data if they want to put limitations on it and what they submitted for approval for their paperwork.

    The doc is from February. If you had some other GPS source in mind, you could always call Appareo and ask. I don’t think anything significant has been released this year other than the Garmin that already has the ADS-B stuff built in.
     
  6. Bacho

    Bacho Pre-Flight

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    Good deal, Thanks for the help.
     
  7. murphey

    murphey Final Approach PoA Supporter

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    The GTX 335 transponder has GPS but I don't think it can be the source for the Appaero.
     
  8. Axtel4

    Axtel4 Pre-takeoff checklist

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    These are the FAA approved ADS-B Out / GPS combinations for certified aircraft: https://www.faa.gov/nextgen/equipadsb/installation/equipment/

    Now, one could conceivably strike out on their own and get approval for other combinations following the guidance of Advisory Circular AC 20-165B in addition to other "hoop jumping."
     
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  9. murphey

    murphey Final Approach PoA Supporter

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    And the 175 is on the list"

    Garmin GTN 625/635/650, GTN 725/750, GIA 63W , S 430W/430AW/480/530W/530AW, GPS 175, GPS 400W/500W (w/ or w/o TAWS) (all require appropriate S/W rev)
     
  10. AK737pilot

    AK737pilot Pre-Flight

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    Something you might check into is if the 175 can use the position data from a GTX 335. I have a 335 (with its own WAAS antenna) with a stub out RS-232 pair and hope to one day use for a G5.

    Could the RS232 feed a 175?


    Sent from my iPhone using Tapatalk
     
  11. murphey

    murphey Final Approach PoA Supporter

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    I had the 335 installed a couple years ago, the G5 a couple months ago. Use the same GPS antenna. The A&P who installed the G5 checked the installation manual, and the RS232 goes to the G5. As for the 175....that requires a second GPS antenna, as per the avionics shop on the field.
     
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  12. WannFly

    WannFly En-Route

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    there is no reason a IFR approved WAAS GPS cant be a position source
     
  13. denverpilot

    denverpilot Taxi to Parking

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    And that’s why I suggested talking to Appero. The 175 only started offering WAAS in March. The doc is labeled Feb.

    The problem is the manufacturers also get to say what combinations are tested and happy with their “easy” install docs. Something else may require more/different paperwork to show it’s a working combination.
     
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  14. bnt83

    bnt83 Final Approach PoA Supporter

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    What transponder specifically?
     
  15. Bacho

    Bacho Pre-Flight

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    No specific choice yet. Right now I have a KT76, skybeacon was my first choice. However I got a good reminder of my transponders age the last couple flights. It seems spending more a little now would be smarter than installing the skybeacon or gdl-82 with my old transponder. So I started looking at the ESG or 335 which are better options for me IMO. But if I was to go with the 175 now instead of later, I could save a few bucks on something like the stratus ES for example.

    I have an A&P and want to do my own work. The 375 is out.
     
  16. Jesse Saint

    Jesse Saint Pre-takeoff checklist

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    You could just hook the existing gps antenna to the 175 and RS232 our from the 175 as position for the 335. The 335 can either use internal gps or an external position source. Same result, but a different way to get there.
     
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  17. MBDiagMan

    MBDiagMan En-Route

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    Sounds like a 375 would be the obvious choice.