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LNAV VNAV Problems (Read 2542 times)

Thunderbird1337 Full Member Offline Posts: 5 Joined: Apr 5^th, 2021	LNAV VNAV Problems Apr 5^th, 2021 at 3:43pm	Print Post
	I figured out, that the autopilot will not follow the LNAV-Profile sometimes. The active waypoint in the FMS wont update in that case aswell. In VNAV-path, the descend-rates are pretty high at the beginning and the autopilot is ignoring overspeed, while trying to get the descend path (eventually a result, as the AP switches from vnav-idle to MCP-spd after a few seconds in descend). Greets


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Thunderbird1337 Full Member Offline Posts: 5 Joined: Apr 5^th, 2021	Re: LNAV VNAV Problems Reply #1 - Apr 5^th, 2021 at 3:48pm	Print Post
	example-pic

	7371.jpg ( 1045 KB \| 94 Downloads )
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Nevzat OLUM New Member Offline Posts: 4 Joined: Apr 5^th, 2021 Gender:	Re: LNAV VNAV Problems Reply #2 - Apr 5^th, 2021 at 5:12pm	Print Post
	yes, there's always that problem. There are also serious problems with the descent and the automatic throttle.


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centurion88 Full Member Offline Posts: 15 Joined: Jun 11^th, 2019	Re: LNAV VNAV Problems Reply #3 - Apr 6^th, 2021 at 2:04pm	Print Post
	I also have this problem with LNAV, it missed the active waypoint and then the autopilot didn't know where to fly.


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EY CS Team Offline Posts: 347 Location: Canada Joined: Nov 9^th, 2005 Gender:	Re: LNAV VNAV Problems Reply #4 - Apr 6^th, 2021 at 3:34pm	Print Post
	AIIR#6


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Thunderbird1337 Full Member Offline Posts: 5 Joined: Apr 5^th, 2021	Re: LNAV VNAV Problems Reply #5 - Apr 18^th, 2021 at 8:16pm	Print Post
	Here you go, the zipfile with the saved scenario

	737.zip ( 34 KB \| 81 Downloads )
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Thunderbird1337 Full Member Offline Posts: 5 Joined: Apr 5^th, 2021	Re: LNAV VNAV Problems Reply #6 - Apr 24^th, 2021 at 1:05pm	Print Post
	Here an example for interesting behavior in VNAV descend and Lvl. Change mode

	737_001.zip ( 138 KB \| 63 Downloads )
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Thunderbird1337 Full Member Offline Posts: 5 Joined: Apr 5^th, 2021	Re: LNAV VNAV Problems Reply #7 - Apr 24^th, 2021 at 1:06pm	Print Post
	pic

	7371_001.jpg ( 741 KB \| 92 Downloads )
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mjpercy New Member Offline Posts: 4 Joined: Apr 24^th, 2021	Re: LNAV VNAV Problems Reply #8 - Apr 25^th, 2021 at 11:18am	Print Post
	Yes I have seen the Lnav and vnav issues too. I also get the autopilot dis connecting especially at lower altitudes, very strange behaviour.


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Raul1011 Full Member Offline Fly, Navigate, Communicate, and cup a coffe! Posts: 61 Location: Spain Joined: Jan 18^th, 2021 Gender:	Re: LNAV VNAV Problems Reply #9 - Nov 22^nd, 2021 at 1:25pm	Print Post
	Same problem here

	i7 \| RTX3060 \| 32 GB \| P3DV4.5
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David Paul Senior Member Offline Posts: 270 Joined: Dec 25^th, 2010 Gender:	Re: LNAV VNAV Problems Reply #10 - Dec 23^rd, 2021 at 3:17pm	Print Post
	I also have problems with LNAV not following the course. This plane is pretty useless as a simulation if this isn't fixed. I would not have purchased had I known this was an issue.

	I5-6600K @4.2 GHZ \| GTX-1070 \| 32GB RAM \| Windows 7/10 Dual Boot on SSD and M.2 FSX-Acceleration \| P3D 4.5 \| MSFS 2020
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NicholasSoares Ex Member	Re: LNAV VNAV Problems Reply #11 - Dec 27^th, 2021 at 1:25am	Print Post
	Same here, seems to be an error when trying to compensate a curve at high speed, tried at lower speed and the error did not happened, also if you try to turn arround it shows a corrupted distance, also i notice that the B and A altitude restrictions are not computed into the star correctly, tring to enforce it manualy as a fixed altitude like 11000A as 11000 seens to fix also the lost lnav for me

	2021-12-26_8-20-12-24.jpg ( 384 KB \| 46 Downloads )
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Cubanito New Member Offline Posts: 2 Joined: Jul 24^th, 2023	Re: LNAV VNAV Problems Reply #12 - Jul 25^th, 2023 at 12:12am	Print Post
	Aircraft (777-300) 1.3.2 will follow the entire flight plan with he exception of the approach, As soon as I start the approach the plane starts banking to the left and then starts flying straight. What is going on?


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Cubanito New Member Offline Posts: 2 Joined: Jul 24^th, 2023	Re: LNAV VNAV Problems Reply #13 - Jul 25^th, 2023 at 12:13am	Print Post
	By the way this happens on MFSM 2020


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