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GPS Garmin GTN 650

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Aircraft Systems, Commercial Pilot, Flight Instructor, General Aviation, Instrument Rating, Private Pilot, Student Pilot

On the GTN 650 what does it mean when the LPV annunciation changes from green to amber

thanks a lot

 

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1 Answers

  1. Best Answer


    John D Collins on Oct 16, 2016

    It is not explained anywhere I can find. However, it indicates that the integrity is below the required value to conduct the approach and that a downgrade to LNAV is likely. If the integrity improves to the required value, the LPV annunciation will turn green. Otherwise, at 1 minute prior to reaching the FAF, the GTN650 will downgrade to LNAV.

    The actual parameters for integrity are not displayed, but on the System>GPS Status page, the value of VFOM (Vertical Figure of Merit) will normally have to be lower than 60 feet to not get the amber indication for an LPV with a DH of 250 feet or higher, or lower than 40 feet to not get a amber indication if the DH is below 250 feet.

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