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GTN750 Unable to use a RNAV approach

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  • R Offline
    R Offline
    rbringh
    wrote on last edited by rbringh
    #1

    With the GTN750 using APP gives me a GS indication while GPS is selected for RNAV approach. Any trick to get it to show a GP indication? Will the 530 do a RNAV approach utilizing GP? Strange, did a flight with both 750 and 530 enabled. It did the RNAV approach but still showed GS. Hit APP well before IAF. It flew it down a path but was way off RWY hdg. Everyone on board was happy...lol.

    sg_aviationS 1 Reply Last reply
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    • R rbringh

      With the GTN750 using APP gives me a GS indication while GPS is selected for RNAV approach. Any trick to get it to show a GP indication? Will the 530 do a RNAV approach utilizing GP? Strange, did a flight with both 750 and 530 enabled. It did the RNAV approach but still showed GS. Hit APP well before IAF. It flew it down a path but was way off RWY hdg. Everyone on board was happy...lol.

      sg_aviationS Offline
      sg_aviationS Offline
      sg_aviation
      wrote on last edited by sg_aviation
      #2

      @rbringh You need to consider if the RNAV approach has a vertical component. If it's LNAV or LP only you may not get a glidepath indication, at least this is what I believe WT implemented and is correct real-life behavior.

      You can also post the procedure you are having issues with for us to crosscheck.

      PS. If you use PMS50 GTN750 you need to install the WTT mode package for TBM 850!

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      • R Offline
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        rbringh
        wrote on last edited by
        #3

        I solved that problem. In the GTN settings Alt source was set to AP. Changed that setting to Constraints and now RNAV works as expected.

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        • sg_aviationS Offline
          sg_aviationS Offline
          sg_aviation
          wrote on last edited by
          #4

          Glad you have been able to solve your issue. I saw that setting as well and did not dare touching it ;)

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