LNAV problem?

[Guest hench289]

I am having a problem with LNAV, I have previously posted about the 747x homing to the next waypoint. I posted a picture of it homing and got no responds. It is still homing to the next waypoint and on the MFD the aiplane doesnt follow the line properly. I have posted a pic of the display and what im seeing. Any ideas PMDG support?Kevin H

[Peter Clark 21]

The only thread I see is one where you post a picture of the FS map, not a panel shot, while complaining about the entire sim and claiming that the problem can't be user error. I don't know about the developers, but in general I find it hard to troubleshoot a problem when the user reports a problem that few, if any, have reported, and doesn't really give the information needed to work on it, and immediately discounts the possibility that they'd possibly be doing anything wrong.

[Guest hench289]

What would a panel shot have shown. Support said the airplane doesnt home. The picture i posted showed the straight line between the two waypoints and the red line was my flight path. This was to prove that the airplane was homing! That was a 90nm stretch and the airplane couldnt track a straight line with a 90kt crosswind. i said there wasnt any user error because they said i was doing something wrong and that i dont know how the airplane navigates. As for no one else having the same problem, why dont you go fly with a 90kt crosswind and fly between two waypoints that are some distance apart and post a picture of your flight path. Kevin H

[Peter Clark 21]

OK, so you have a 90 knot crosswind and the aircraft isn't applying enough of a crosswind correction, they've acknoweldged this issue (which your original message said had no replies to), so might I ask what more do you expect at this point? I'm not trying to be an #### here, but I'm not quite sure what the problem is.

[Guest hench289]

>OK, so you have a 90 knot crosswind and the aircraft isn't>applying enough of a crosswind correction, they've>acknoweldged this issue (which your original message said had>no replies to), so might I ask what more do you expect at this>point? I'm not trying to be an #### here, but I'm not quite>sure what the problem is.>Can you post me a link where they said they have acknowledge this issue please. And if they did acknowledge it why would support tell me that i was wrong and the airplane doesnt home. If it doesnt apply enough crosswind correct then it is homing. Dont think you are being an *****. If they did address that there was a problem im sorry and i take back the comments but i have looked through the forum and havent seen anything about it that why i have posted again about the issue.Kevin

[Peter Clark 21]

Can you post a link to the original thread, including the panel screenshots showing the LNAV/VNAV MCP status, ND with wind correction, and the aircraft being offset from the magenta line?

[Guest hench289]

>Can you post a link to the original thread, including the>panel screenshots showing the LNAV/VNAV MCP status, ND with>wind correction, and the aircraft being offset from the>magenta line?> I didnt post those screenshots, the only one i posted was the one with the FS map showing the airplane was homing. Support said the airplane doesnt home so i showed them a picture that is does home. I am flying it right now and i have a 30 kt quartering tailwind and its getting blown off the line which is going to cause it to home will post a pic. Can you please post a link to where they sadi they acknowledge this issue!!Kevin This picture i just posted i just passed my previous waypoint and you can see im getting blown off the line which is causing me to home.

[Peter Clark 21]

Interesting, I've never see that behaviour and have had over 100 knot winds (ASX near that tropical depression which blew through BOS yesterday).I mis-read your message, I thought you had said they acknoweldged the issue not that they said it didn't home. Apologies. I really should have more coffee before posting. Still, I've had some good jet streams through my flights and haven't been off the magenta line at all. Hopefully with a screenshot of the aircraft actually doing it some additional minds can jump in now.One thought - your leg is over 500NM. Is it homing or is it doing great-circle with the magenta line drawn incorrectly? Does it do it over shorter legs?

[Guest kcwestin]

I having the exact problem as you described also. It looks like your attached picture for me too. I used FSBuild 2.3 to make the flightplans, I dont know if thats the problem but FSBuild works in other addons. I havent tried a FSX generated flightplan yet.Christer W

[Guest hench289]

>Interesting, I've never see that behaviour and have had over>100 knot winds (ASX near that tropical depression which blew>through BOS yesterday).>>I mis-read your message, I thought you had said they>acknoweldged the issue not that they said it didn't home. >Apologies. I really should have more coffee before posting. >Still, I've had some good jet streams through my flights and>haven't been off the magenta line at all. Hopefully with a>screenshot of the aircraft actually doing it some additional>minds can jump in now.>>One thought - your leg is over 500NM. Is it homing or is it>doing great-circle with the magenta line drawn incorrectly? >Does it do it over shorter legs?Yes it is homing, my picture i posted of the FS map was only a 90nm stretch. Hopefully someone from support can point me in the right direction. It was doing it before the update and is still doing after the update so uninstalling/reinstalling error is not the case.

[Peter Clark 21]

Your picture was a zoomed stretch of a 500NM leg. It would be intersting to see if it does it when your waypoints are only, say, 100NM apart.

[Guest hench289]

>Your picture was a zoomed stretch of a 500NM leg. It would>be intersting to see if it does it when your waypoints are>only, say, 100NM apart.>it does do that with smaller stretches, the original picture i posted of the FS map was only 90nm!Kevin

[Peter Clark 21]

So the distance between waypoints in the FMS was only 90NM in your original report? That's why a screenshot of the aircraft, not the FS map, is much more useful when reporting things. It gives the developers that kind of information.I'll have to fly a NAT tomorrow and see if I can experiment and in a controlled test reproduce this with long legs, since I can't with short ones (that being 250NM or less) at all. I vuagely recall this issue with (something? I forget which addon) in FS9 and it turned out to be the long distance legs and the difference between great-circle and flat-earth modelling on the NDs magenta line. It wasn't homing, it was flying perfectly the great-circle route between the two long-away waypoints but the ND line was flat-earth so it looked like it was off-track when it wasn't.

[Guest hench289]

>So the distance between waypoints in the FMS was only 90NM in>your original report? That's why a screenshot of the>aircraft, not the FS map, is much more useful when reporting>things. It gives the developers that kind of information.>>I'll have to fly a NAT tomorrow and see if I can experiment>and in a controlled test reproduce this with long legs, since>I can't with short ones (that being 250NM or less) at all. I>vuagely recall this issue with (something? I forget which>addon) in FS9 and it turned out to be the long distance legs>and the difference between great-circle and flat-earth>modelling on the NDs magenta line. It wasn't homing, it was>flying perfectly the great-circle route between the two>long-away waypoints but the ND line was flat-earth so it>looked like it was off-track when it wasn't.>I understand that, but it didnt have that issue in fs9 so im sure it didnt carry over to fsx. That first picture i posted in this post was a short distance between waypoints, as you can see i only am 33nm away. Kevin H

[bsmonroe 0]

The same problem here as well - the airplane will track between the waypoints - but it does not follow the flightplan path (the magenta line) and the deviations are severe enough that FS ATC issues course corrections when on an ILS flight.Brian Monroe