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IFD540 LPV Vertical Alert Limit
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by9468840 View Drop Down
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    Posted: 24 Feb 2022 at 8:08am
Hi 

I was on course to intercept LPV final aproach last night and suddenly I saw LNAV/VNAV on the screen and Alerts flashing amber. It said "LPV VAL alert" can't remember exactly what it was and it had a counter that looked like about 1min. Approach was degraded to LNAV/VNAV but GP never became available. I had to abort and come back resequenced for an ILS approach instead. 

There is no information on the manual about such LPV Val alert and I have never seen it before.
does anyone know what that was?
Baris 
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AviSteve View Drop Down
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Points: 2246 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AviSteve Quote  Post ReplyReply Direct Link To This Post Posted: 24 Feb 2022 at 10:26am
Maybe the alert said "LPV Unavailable Use L/VNAV DA"?  That alert is generated when the GPS doesn't have sufficient integrity to to the LPV approach.  The IFD compares the Horizonal Protection Limit (HPL) from the GPS to the Horizontal Alert Limit (HAL) associated with the approach.  If HPL exceeds HAL, you'll get the alert and the LPV approach is unavailable.
Steve Lindsley
Avidyne Engineering
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by9468840 View Drop Down
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Points: 9 		Post Options Post Options   Thanks (0) Thanks(0)   Quote by9468840 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2022 at 8:54am
Hi Steve

this is what I have in the logs

Select approach VTF.RNAV 6
vDev failed - couldn't compute it   (actLegNOTonFinal hat=2890 notPaQual Integ OK)
  Lev:0 Cmd:2 Pri:008/000 Rpt:01 Own:00 Sent:00 IssueTm:65544 Dur:0 AD:0 ID:        TermMode sMsg:<> lMsg:<>
  Lev:3 Cmd:0 Pri:008/000 Rpt:01 Own:00 Sent:00 IssueTm:65544 Dur:0 AD:0 ID:        Approach sMsg:<> lMsg:<>
  Lev:1 Cmd:0 Pri:008/000 Rpt:01 Own:00 Sent:00 IssueTm:65544 Dur:0 AD:0 ID:          UseLV2 sMsg:<LPV Unavailable Use L/VNAV DA> lMsg:<Exceeded LPV VAL>
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