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 25 FMC (incl LNAV, VNAV) (Read 10152 times)
hobbseltoff
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Re: FMC (incl LNAV, VNAV)
Reply #75 - Aug 7th, 2018 at 2:30am
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hobbseltoff wrote on Jul 27th, 2018 at 3:27am:
When going direct to a fix, it will disappear from the top of the list on the legs page. 


I am still having this issue, even after upgrading 1.2.

Repro steps:

Route programmed in: KSEA 34R SUMMA1 BKE J54 BOI J15 JNC ALS PNH MDANO KDFW

1. Use the LSK to select a point on the legs page, I find it most consistently repros when you try to go to direct your next point.



2. Use LSK1 to paste the point back at the top of the legs page.



3. Execute. Notice how the fix now disappears from the top of the legs page.



After this, BOI became the active fix although BKE remained on the ND. LNAV gave up and did not attempt to navigate to BOI, it just slowly turned left for a bit as shown by the PFD.



AIIR#6

Edit: Added attachment. In the scenario, wait until the aircraft passes SUMMA and then while it is turning towards BKE, perform the above steps and go direct BKE.
  

CS757_Bug_Repro.zip ( 22 KB | 19 Downloads )
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alf46
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Re: FMC (incl LNAV, VNAV)
Reply #76 - Aug 8th, 2018 at 4:06am
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I installed the version 1.2 and i still do not have the option ""INTC CRS waypoint intercept course creation""??????? I tried everything like said in the manual part 2, page 426 but this is still only available in the option ""MODIFICATION OF THE ACTIVE WAYPOINT (MOD), and when i insert a course in the INTC CRS TO: in the (MOD) option, the plane do not intercept and follow the magenta line, only fly direct wherever the plane is to the waypoint or vor after press the LNAV button. Thanks.
  

-2018-aug-8-003.jpg ( 341 KB | 35 Downloads )
-2018-aug-8-003.jpg
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trevors
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Re: FMC (incl LNAV, VNAV)
Reply #77 - Aug 8th, 2018 at 3:42pm
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1.   VNAV climb and speed change over to mach:
      The FMC indicates a CLB speed of 306KIAS / M.786
      Above FL100, speed changes to 306 and the plane adjusts
      pitch to accelerate from 250 to 306. So far, so good.
      When reaching M.786 however, there is no immediate change
      in pitch to adjust for mach. Speed sometimes increases right
      up to M.80 before the plane "realizes" it must pitch up.
      The VS then goes beyond 3000'/minute to correct the mach
      down to M.786. Thereafter, its fine again.

2.    While flying at FL390, I see the little red blocks on the speed tape indicating overspeeds.
       However, there are no little yellow blocks on the speedtape to indicate the stall speeds.

AIIR#6

Trevor
  
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trevors
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Re: FMC (incl LNAV, VNAV)
Reply #78 - Aug 9th, 2018 at 5:08pm
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I have attached files - I hope they are the correct ones.
I am using FSX-SE and these are the only files I could find in the
documents folder.
If they are not correct, please explain how to produce these files.

Trevor

Thanks!
  

757_FSX.zip ( 324 KB | 16 Downloads )
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trevors
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Re: FMC (incl LNAV, VNAV)
Reply #79 - Aug 10th, 2018 at 9:21am
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Hi

Tried again using the PW2040 model.
No problem with the speed/mach change over.

However, still no yellow blocks on the speed tape to indicate
stall speeds. Slowed right down to M.7 at FL390 and saw no warnings indicated on the speed tape.

Trevor
  
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trevors
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Re: FMC (incl LNAV, VNAV)
Reply #80 - Aug 10th, 2018 at 3:48pm
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Hi

I re-installed the 757 and now the speed/mach changeover works correctly in the PW2037 model.

However, still no stall warning/indication on the speedtape. This needs your attention please.

Regards
Trevor
Smiley
  
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dubatm
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Decent
Reply #81 - Aug 25th, 2018 at 9:29am
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I am having a problem with the latest version, the aircraft doesn't follow the Vnav decent it goes down at 4000 fpm until it hits the ground.
  
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KrisJ
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Re: FMC (incl LNAV, VNAV)
Reply #82 - Sep 4th, 2018 at 4:56pm
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Flown EGLL STAR today and the a/c does not maintain STAR altitude limits at all. It should level off at 6000 feet but it continues climbing up to MCP altitude.

Right, because MCP always has priority over FMC.
  
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KrisJ
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Re: FMC (incl LNAV, VNAV)
Reply #83 - Sep 5th, 2018 at 6:47am
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Thanks for the answer. I thought MCP has priority when its below FMC alt and climbing so aircraft will level off at MCP. However when MCP is above FMC limited alt and aircraft is operating in VNAV it should stick to flight plan (star) altitude limits and continue to MCP when clear of STAR altitude restrictions. But i might be wrong.
  
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KrisJ
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Re: FMC (incl LNAV, VNAV)
Reply #84 - Sep 5th, 2018 at 8:49pm
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Also, Approach page calculates planned Vrefs instead of acctual which is wrong. It very accurately calculates planned landing weight and respective Vrefs but Thats not the point. The system should give you always your acctual weight in case you need to return due to engine out or diverte enrout.
  
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Dreamflight767
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Re: FMC (incl LNAV, VNAV)
Reply #85 - Sep 30th, 2018 at 6:57pm
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I too am having a problem with VNAV.  I was inbound to SLVR and changed the STAR.  The VNAV began a 4,000'+ decent.  There was one crossing restriction 200KT/3000' which was at least 140NM away.

AIIR#6

  
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Redz Carib268
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Re: Decent
Reply #86 - Oct 14th, 2018 at 4:22am
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dubatm wrote on Aug 25th, 2018 at 9:29am:
I am having a problem with the latest version, the aircraft doesn't follow the Vnav decent it goes down at 4000 fpm until it hits the ground.


In addition, it does not follow the speed restrictions either.

When you set an ALT in the MCP from cruise ALT, it will begin its descent as per the calculated TOD. When you check the star, there are several speed restrictions in the FMC, but the a/c does not obey these restrictions. Further, when you add speed restrictions based on Part 2 Pages 465-472, the aircraft just descents and blows through the speed constraints.


For example, even though there are speed restrictions to cross -let say FLIPR at 280/12000, I like to have a speed transition of 240/16000. For me, it helps to keep the a/c under 250 below 10k...yet the aircraft does not obey either one.

I have to manually enter the speed in the MCP and use FLCHG to manage it.

P'Rez
  
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hellboyhuy
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Re: FMC (incl LNAV, VNAV)
Reply #87 - Nov 8th, 2018 at 5:10am
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Are we going to including the function so the plane can do RNAV approach? It doesn't indicate that it got the GP and FAC.

AIIR#4
  
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hellboyhuy
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Re: FMC (incl LNAV, VNAV)
Reply #88 - Nov 9th, 2018 at 4:06am
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Step climb doesn't exist unless you change the FL in the perf then it will follow VNAV up.

Also, why does VNAV only descend when it hit around 3000 to 4000 fpm? Can it descend a little bit less like 1500 to 2000 constant to provide more passenger comfort

AIIR#4
  
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