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LPV downgrade |
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Craig767 
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Joined: 17 Dec 2014 Location: Gainesville, FL Status: Offline Points: 98 |
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 Topic: LPV downgradePosted: 23 Apr 2023 at 7:31pm |
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Was doing practice apps the other day when the IFD540 downgraded the LPV. Got an alert message about the issue and IFD showed GPS-LNAV+V. Except there was no +V.
Does the IFD default to LNAV only, even though it had a +V. I think Garmin does this, not sure about Avidyne. Craig
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AviSteve
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Joined: 12 Feb 2018 Location: Melbourne, FL Status: Offline Points: 2153 |
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Posted: 23 Apr 2023 at 9:50pm |
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The FMS will go to LNAV+V and provide advisory vertical deviations only if there is a descent angle associated with the approach (i.e. specified in the database).
I did get confused by the wording of your question. What does "Except there was no +V" mean? Does that mean that the +V didn't appear in the upper right corner or does it mean that you didn't get advisory vertical deviations during the approach?
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Steve Lindsley
Avidyne Engineering |
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Craig767
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Joined: 17 Dec 2014 Location: Gainesville, FL Status: Offline Points: 98 |
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Posted: 23 Apr 2023 at 10:40pm |
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There was no advisory vertical deviation although the IFD showed LNAV+V. Though it was curious that although the IFD determined the LPV criteria was not met, it still showed +V. Would have made more sense to have seen just LNAV.
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