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Rapid Speed Increase in VNAV Descent (Read 1902 times)
thaliabobalia
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Rapid Speed Increase in VNAV Descent
May 9th, 2020 at 7:22pm
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Hi, All

Loving the 767 and have had a lot of fun with it. I know that a lot has been discussed about VNAV and the FMC sticking to its restrictions so please excuse me if this has already been discussed.

I just completed a flight from EHAM-PDX. Everything went smooth on the climb and cruise and initial part of the descent. Upon reaching KRATR on the KRATR 2 RNAV ARR, the speed rapidly climbed to 400+ kts although the restriction I had set was 240/10,000. This has happened to me on other STAR's as well but I thought I would document this one. Please see picture below.

Is this a bug or am I possibly doing something wrong?

Thanks in advance
  

OnPaste_20200509-151652.png ( 1250 KB | 71 Downloads )
OnPaste_20200509-151652.png
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thaliabobalia
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Re: Rapid Speed Increase in VNAV Descent
Reply #1 - May 9th, 2020 at 7:25pm
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thaliabobalia wrote on May 9th, 2020 at 7:22pm:
Hi, All

Loving the 767 and have had a lot of fun with it. I know that a lot has been discussed about VNAV and the FMC sticking to its restrictions so please excuse me if this has already been discussed.

I just completed a flight from EHAM-PDX. Everything went smooth on the climb and cruise and initial part of the descent. Upon reaching KRATR on the KRATR 2 RNAV ARR, the speed rapidly climbed to 400+ kts although the restriction I had set was 240/10,000. This has happened to me on other STAR's as well but I thought I would document this one. Please see picture below.

Is this a bug or am I possibly doing something wrong?

Thanks in advance


Sorry, forgot to mention that I am running P3D 4.5 HF2, 767 .94, REX, and Active Sky.
  
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Alex T
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Re: Rapid Speed Increase in VNAV Descent
Reply #2 - May 9th, 2020 at 7:52pm
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You wouldn’t happen to have a pic of your active VNAV page do you?
  
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thaliabobalia
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Re: Rapid Speed Increase in VNAV Descent
Reply #3 - May 9th, 2020 at 9:35pm
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No, unfortunately I do not. I will snap a picture of the VNAV page next to me I see this occurring. I am pretty certain that I have it set up correctly but maybe I have missed something!

Has anybody else experienced this?
  
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thaliabobalia
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Re: Rapid Speed Increase in VNAV Descent
Reply #4 - May 10th, 2020 at 4:36pm
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I had this happen again earlier today on a flight from PHOG-KLAX. Attached is a photo of the VNAV page of the FMC. Any thoughts?
  

Capture1.PNG ( 1346 KB | 73 Downloads )
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thaliabobalia
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Re: Rapid Speed Increase in VNAV Descent
Reply #5 - May 11th, 2020 at 10:37pm
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Has anybody else experienced this?
  
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CaptLE
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Re: Rapid Speed Increase in VNAV Descent
Reply #6 - May 12th, 2020 at 1:34pm
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Hi,

I cannot comment on the 767 as I have yet to purchase it, but I documented a very similar issue in the 757 last year,
please see reply #2 of the following thread: https://www.captainsim.org/forum/csf.pl?num=1559949362

I'll have to test this again in the near future, as it's been a while since I used the SEL SPD function.

Thanks.
  

Liam Evans
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Alex T
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Re: Rapid Speed Increase in VNAV Descent
Reply #7 - May 12th, 2020 at 1:41pm
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Yeah I have the same exact issue, when I’m doing Sel spd during a VNAV descent. I know CS is actively working on a 240/10000 bug, this fix may fix both problems.
  
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N90831
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Re: Rapid Speed Increase in VNAV Descent
Reply #8 - May 12th, 2020 at 5:54pm
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Maybe this will help someone.

I have had all of these problems and more with the FMS. However, I noticed that since my install of the 767 my other CS planes FMS (especially the VNAV) was acting screwy.

So what I did was reinstalled the latest version of my CS757 basepack and presto all my CS planes to include the 767 work fine with VNAV and the entire FMS.

Of course I backed up all my 757 junk before I did this so beware.
  

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Captain Sim
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Re: Rapid Speed Increase in VNAV Descent
Reply #9 - May 13th, 2020 at 2:04pm
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Alex T wrote on May 12th, 2020 at 1:41pm:
Yeah I have the same exact issue, when I’m doing Sel spd during a VNAV descent.

Pls attach a flight saved on the issue.
  
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