Avidyne Homepage
Forum Home Forum Home > Avidyne General > IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM
  New Posts New Posts RSS Feed - IFD540 LPV Vertical Alert Limit
  FAQ FAQ  Forum Search   Register Register  Login Login

IFD540 LPV Vertical Alert Limit
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
by9468840 View Drop Down
Newbie
Newbie


Joined: 21 Jan 2021
Location: Switzerland
Status: Offline
Points: 9 		Post Options Post Options   Thanks (0) Thanks(0)   Quote by9468840 Quote  Post ReplyReply Direct Link To This Post Topic: IFD540 LPV Vertical Alert Limit
    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 
Back to Top
AviSteve View Drop Down
Admin Group
Admin Group
Avatar

Joined: 12 Feb 2018
Location: Melbourne, FL
Status: Offline
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
Back to Top
by9468840 View Drop Down
Newbie
Newbie


Joined: 21 Jan 2021
Location: Switzerland
Status: Offline
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>
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.180 seconds.