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 25 FMC (incl LNAV, VNAV) (Read 6191 times)
Tanya
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FMC (incl LNAV, VNAV)
Dec 28th, 2017 at 5:27pm
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Captains,
There's always room for improvement so feel free to report any issues but:

0. Please make sure you have read the Manual. 770+ handmade pages describing thousands of hard-coded features. Great reading.

1. Please report an issue if you are 100% sure it is a bug. Not sure? Please use General Discussion

2. Please use proper threads. E.g. do not post MCP issues in the FMC thread.

3. One issue ONE post, please.

4. Please provide a reference to the Manual page #.
CS Manual is based on the original Boeing's FCOM. For obvious reasons we cannot do all operators optional equipment variants.
It's not a bug if it's not in the Manual.

In some cases we can consider a reference to an operator's official Manual or CBT.
But any info from a third party software or from personal experience IS NOT a reference material. 

Also the Manual reference page # is absolutely required for all flight related and performance comments as we cannot work with the "slower-faster" kind of data. Official Boeings' numbers are absolutely required.

5. Please provide screenshots and/or screen capture videos for each issue.
Easy to use free services:
- For the screenshots: https://onpaste.com/
- For the videos:  https://screencast-o-matic.com/
Also you can attach an image to your forum post.

6. For all flight related floating issues (FMC, MCP, VNAL/LNAV etc) please SAVE the flight right on the issue, zip all 3 files of the flight (.fxml  .wx  .config) located ....\Users\you\Documents\Prepar3D v4 Files\ , upload the zip to any free hosting service (e.g. Google disc) and include the URL into your report.

COMPLETE AND CORRECT REPORTS WILL BE FORWARDED TO THE DEVELOPMENT TEAM.

CS developers will make marks and comments right in your post as follows:

- The red AIIR# mark in your post means: sounds like a bug but Additional Information Is Required indicating the numbers as per the list above.

- The blue SW means: Should work. So we need more users to confirm the issue.

- Highlight means the items is on the list.

Developers comments are in magenta.

Please DO NOT use any text color/effect other than plain black.

Thank you all for your input!
  
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reddishknight
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Re: FMC (incl LNAV, VNAV)
Reply #1 - Jan 1st, 2018 at 8:20pm
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Can only input 2 digits for center of gravity instead of the 3 needed

AIIR#4
  


Intel i5 4690k
GTX 970
Win 7 x64
ZMA_I1
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albertofranco14
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Re: FMC (incl LNAV, VNAV)
Reply #2 - Jan 2nd, 2018 at 7:32pm
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Having an issues with the VNAV page. It keeps switch from ECON CRZ to LIM SPD CRZ by it self.

Here is a quick video showing it.
youtu.be/ UGjmxxiau5c

This happened on my second flight with the aircraft.

AIIR#6
  
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Tonylin409
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Re: FMC (incl LNAV, VNAV)
Reply #3 - Jan 3rd, 2018 at 4:57am
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VNAV speed/Mach mismatch.

while VNAV engaged,Aircraft is not maintain the  MACH that I`ve enter in CRZ page.  Aircraft is at FL340, FMC programed to FL340.

Please check the target speed on speed tape in the video. I circle the mouse around it for comparison.

watch?v=rdNfhfXQCvY   Here`s video on youtube for the bug.  I`m not allow to post video link before 10th post

AIIR#4
  
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fsx
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Re: FMC (incl LNAV, VNAV)
Reply #4 - Jan 3rd, 2018 at 11:35am
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If I change the Cruise Altitude on the VNAV page while in cruise, the aircraft automatically climbs to that altitude without me commanding the new (higher) altitude on the MCP.

AIIR#4
  
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Tonylin409
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Re: FMC (incl LNAV, VNAV)
Reply #5 - Jan 3rd, 2018 at 4:26pm
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PART II page 340.

At cruise altitude, the FMC commands economy cruise speed or the pilot
entered speed until reaching the top-of-descent (T/D) point. Alternate cruise
speed options are:
 long range (LRC)
 engine out (ENG OUT), or
 flight crew entered speed. 


FYI. This kind of work (provide the manual page) is really low. Developer or beta tester should know this aircraft better than any of us. We`re simply reporting the problem, what you should do is try to recreat the problem instead of telling us go to read the manual.

go check-out the video. You`ll see what I`ve said.

Tonylin409 wrote on Jan 3rd, 2018 at 4:57am:
VNAV speed/Mach mismatch.

while VNAV engaged,Aircraft is not maintain the  MACH that I`ve enter in CRZ page.  Aircraft is at FL340, FMC programed to FL340.

Please check the target speed on speed tape in the video. I circle the mouse around it for comparison.

watch?v=rdNfhfXQCvY   Here`s video on youtube for the bug.
  I`m not allow to post video link before 10th post

AIIR#4

  
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cptryan91
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Re: FMC (incl LNAV, VNAV)
Reply #6 - Jan 3rd, 2018 at 7:49pm
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The Menu Options in FMC for pause at TOD, display KG etc isn't saving at all once you load another flight after closing the sim.

Would be really handy for it to save as it's a bit of a hassle having to remember to click through disabling pause at TOD then realistic alignment and so on every single flight  Smiley

Not a bug, but may work as a suggestion.
  
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Scholli04
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Re: FMC (incl LNAV, VNAV)
Reply #7 - Jan 4th, 2018 at 5:35pm
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My ECON Mach Number is always calculated at almost M.78, regardless of the CI used.
At CI50 I get M.780, at 999 M.786.
These are much to close to each other.

AIIR#4

Both PFPX and SimBrief calculate about M.80 for a CI of 120 for instance.
I'm sure your real 757 pilots will be able to give you some more detailled reference than I can, but it is obvious that the CI as it is right now does not reflect what any other aircraft does.

  
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Tim Smith
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Re: FMC (incl LNAV, VNAV)
Reply #8 - Jan 5th, 2018 at 6:37am
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Entered climb speeds of 290/.780 in the VNAV climb page and the aircraft does not switch to using the Mach speed at the crossover.

Currently still climbing at 290kts IAS, despite already pushing mach .80 and over FL330

AIIR#4
  
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Scholli04
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Re: FMC (incl LNAV, VNAV)
Reply #9 - Jan 5th, 2018 at 10:19pm
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Scholli04 wrote on Jan 4th, 2018 at 5:35pm:
My ECON Mach Number is always calculated at almost M.78, regardless of the CI used.
At CI50 I get M.780, at 999 M.786.
These are much to close to each other.

AIIR#4

Both PFPX and SimBrief calculate about M.80 for a CI of 120 for instance.
I'm sure your real 757 pilots will be able to give you some more detailled reference than I can, but it is obvious that the CI as it is right now does not reflect what any other aircraft does.



I can for some reason not edit my post, so I'll have to answer this way to your AIIR#4

As you know the Boeing FCOM does not contain an exact CI/Mnr table, so I can't give you any exact table.
I'm sure your project advisors and 757 pilots will be able to give you at least some rough data to get a closer approximation than you currently have.

Boeing themselve give a few examples of CI's and their resulting speeds though: http://www.boeing.com/commercial/aeromagazine/articles/qtr_2_07/article_05_2.htm...
None of these match your simulation.

From the table:
Cost Index 70
Cruise Mach .794

In your simulation:
Cost Index 70
Cruise Mach .780

From the table:
CI 0
M.778

In yours:
CI 0
M.780 (identical to CI70, this is a big no no! Such a big difference CAN not result in zero speed difference!)

And finally:
Boeing:
CI 9999
M.847

In yours:
CI 9999
M.838


Furthermore in your simulation the resulting cruise Mach is independent of the GW, so we can assume the above Boeing data to be correct or at least close.
In your simulation I can't reach a cruise Mach number of .790 before a CI of 1800.
That's clearly far off the Boeing numbers. FIXED

Thanks, OTL!

I know this is not a certain proof, however it is clear and any real pilot will tell you that your numbers are off here.
  
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Tonylin409
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Re: FMC (incl LNAV, VNAV)
Reply #10 - Jan 6th, 2018 at 1:35am
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Unable to select Intercept CRS or Abeam pts function in MOD RTE 1 LEGS page.

CS manual Part 2 Page 412

AIIR#6 and the fpln file pls
  
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Scholli04
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Re: FMC (incl LNAV, VNAV)
Reply #11 - Jan 6th, 2018 at 1:34pm
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Tonylin409 wrote on Jan 6th, 2018 at 1:35am:
Unable to select Intercept CRS or Abeam pts function in MOD RTE 1 LEGS page.

CS manual Part 2 Page 412

AIIR#6 and the fpln file pls


Same here. Happens on actually ANY flight with any route.
Simply use your own takeoff in Seattle saved flight and then enter a direct after takeoff.
You won't have the mentioned options available.
  
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Darien
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Deleted Flight Plan and Data After Second Leg
Reply #12 - Jan 6th, 2018 at 3:08am
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First and foremost I want to say thanks for this aircraft! The more I use it the more I enjoy it despite it's bugs. However I just wanted to report the issue even though I know for a fact that addition info will be required. I am trying to see what I can gather. For the issue and this is with any second consecutive leg that I do; my EPR button will not work. I will then slowly increase my throttle and by the time I get past half of the runway, it will seem to erase my flight plan and initialization data that I had put in. Undecided I do have a video but I don't think I'll be able to post it since I don't think I have enough posts and for the fact I haven't uploaded it anywhere.

P.S. I will try to find any additional information you may need but as I said, I just felt the need to point it out Smiley
  

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Wise87
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Re: Deleted Flight Plan and Data After Second Leg
Reply #13 - Jan 6th, 2018 at 5:44am
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I posted the same thing in the Bug Tracking (Autopilot MCP part only) on release day and the only reply I got back from CS was "Not MCP for sure  Wink". Not even help to post in the correct section or provide additional information. Maybe they will take you more serious.
  
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Darien
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Re: Deleted Flight Plan and Data After Second Leg
Reply #14 - Jan 6th, 2018 at 6:21am
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Well because it actually doesn't involve the MCP. It involves the CDU. Smiley
  

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