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dracer33

Possible post SP1 bug

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I just started noticing this after a fresh install of the NGX and SP1. I will have the bird sitting on the runway correctly set up for a flight with LNAV and VNAV armed. I engage TOGA and the LNAV and VNAV lights on the MCP extinguish as expected, however once airborne and at 500' AGL the VNAV button becomes re-lit as it's supposed to but the LNAV button does not. It's strange because LNAV is engaged as shown in green letters on the PFD but the MCP says the opposite. If I re-press the LNAV it will show the light on the MCP and everything show's normally. I'm confused because this hadn't occured prior to SP1 and with an aircraft that had such a large emphisis on detail and realism is this possibly a new bug created by SP1 or just my user error? Thanks.Devin Mack

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The LNAV button lighting up on the MCP doesn't mean it's engaged. That only means it can be disengaged by pressing the button again. The pfd is the only place to see which modes are engaged.

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The LNAV can´t engage if the first wp is offset by >5 degree. You´ll have to flyHeading until you come in the turn, then you can engage it./ Leffe

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The LNAV button lighting up on the MCP doesn't mean it's engaged. That only means it can be disengaged by pressing the button again. The pfd is the only place to see which modes are engaged.
Thank you for the reply Kenneth. And you're exactly right, the autopilot will follow the LNAV path perfectly without the lighted LNAV button. But isn't the light supposed to turn on in unison with the VNAV button upon climbing through 500' AGL?
That is true but in this case LNAV IS engaged and the light should be on.Same as the VNAV light is on.
Jason so I am correct that the LNAV light should be on, is there anything I could being doing for this to occur?Devin Mack

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Thank you for the reply Kenneth. And you're exactly right, the autopilot will follow the LNAV path perfectly without the lighted LNAV button. But isn't the light supposed to turn on in unison with the VNAV button upon climbing through 500' AGL?Devin Mack
See my post further up/ Leffe

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See my post further up/ Leffe
His LNAV is engaged. He's talking about the button on the MCP not being illuminated.

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See my post further up/ Leffe
Thanks Leffe, the thing is LNAV is engaged, if you enlarge the screenshots I had uploaded you can see that the waypoint RBELL is directly in front of me on the takeoff heading. In fact the autopilot took me all the way to my destination perfectly without me interferring after the last screen shot was posted everything was fine except the LNAV light on the MCP never illuminated.Devin Mack

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His LNAV is engaged. He's talking about the button on the MCP not being illuminated.
Yeah I saw that now in the last pics./ Leffe
Thanks Leffe, the thing is LNAV is engaged, if you enlarge the screenshots I had uploaded you can see that the waypoint RBELL is directly in front of me on the takeoff heading. In fact the autopilot took me all the way to my destination perfectly without me interferring after the last screen shot was posted everything was fine except the LNAV light on the MCP never illuminated.Devin Mack
Thx I saw that just now. Peculiar....and you have both Flightdir on?/ Leffe

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Thx I saw that just now. Peculiar....and you have both Flightdir on?/ Leffe
Yes sir I do, VNAV wouldn't arm on the ground unless both were on.
Oh, it didn't light up the entire flight?
Nope, it remained like that until I manually disengaged and then turned LNAV back on. Then the light turned on as well.Devin Mack

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Peculiar. Can you change to the normal PFD/ND gauges.....try and see if it´s the same thenAlso try to push it once more./ Leffe

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Peculiar. Can you change to the normal PFD/ND gauges.....try and see if it´s the same thenAlso try to push it once more./ Leffe
Still the same results Confused.gifDevin Mack

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Then I don´t know why this occur. It can´t be a bug causeI have no probs with it stayed lightend when it´s engaged/ Leffe

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Straight%20Face.gif what a perplexing situation. Well thanks for your help Leffe. Oh and yes if I manually press the LNAV button after takeoff it will stay lighted, it's just the after takeoff procedue that is giving me the trouble.Devin Mack

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Same problem happends over there, actually I disappointed from all those Flight-Sim payware addons.I have also expected gauges FREEZE in VC, seems like PMDG saving money to perform good QA.I work in software development Industry and I know exactly how those parts are working.It is disappointing to see how they brawely release SP1 with many bugs, and everybody says they're genious, maybe they just the best of worse but not more.I'm not familiar with real aircraft systems, but details of PMDG are really impressing, the only problem is a quality and bugs.

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Straight%20Face.gif what a perplexing situation. Well thanks for your help Leffe. Oh and yes if I manually press the LNAV button after takeoff it will stay lighted, it's just the after takeoff procedue that is giving me the trouble.Devin Mack
looks like a weird situation.first thing i wanted to suggest is to change the PFD display layout but you've already tried that.1.What happens if you set the autobrakes OFF (currently still RTO) and the landing gear the the OFF position?2.You're taking off with FLAPS 1 and when airborne they are 5 or do i misinterpret the screenshots?3.Are you able to reproduce this issue when using another route/SID ?

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At least from what I know, only LNAV is armed on gnd.VNAV suppose to be engadged passing 400 AGL and it will be armed passing 400 AGL only.And light bolbs can be burned, FMA is the only place to look for what the AC is doingand his mode.

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And light bolbs can be burned
Not the issue here as he clearly states he can press it to come alive manually,The issue is why it doesn't appear lit automatically like the VNAV button

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Not the issue here as he clearly states he can press it to come alive manually,The issue is why it doesn't appear lit automatically like the VNAV button
Didn't say this is the issue. Just said that when you fly, MCP lights are not where you should look tosee which mode is on.FMA is the place.

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Have the same problem - thought it was me but perhaps not.To add to the above.1. Pre - TO. Select LNAV on MCP - it arms {white on FMA}2. Post TO. LNAV engages correctly {green on FMA} but LNAV light on MCP extinguishes.3. Climb/Cruise. LNAV remains engaged {green on FMA} and follows correct route - LNAV MCP light remains out4. At any stage - press LNAV on MCP: LNAV disengages and AP reverts to CWSR5. Press LNAV again and LNAV re-engages and reverts to normal operation.As with the OP could not find this in FCOM or tuuorial so perhaps some of our experts could advise as they do not see it- is it something in my NGX set up?John Rooum

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looks like a weird situation.first thing i wanted to suggest is to change the PFD display layout but you've already tried that.1.What happens if you set the autobrakes OFF (currently still RTO) and the landing gear the the OFF position?2.You're taking off with FLAPS 1 and when airborne they are 5 or do i misinterpret the screenshots?3.Are you able to reproduce this issue when using another route/SID ?
Thanks for your ideas Antoine, sadly I tried them all and the event still occurs regardless of my takeoff config, local, or SID. Oh and the flaps had been different in the screen shot because in the original ones I took while on the ground with flaps 1 I had forget to take a screenshot in the air so I restarted the flight and changed the weights a little to set flap 5, either way the issue still persists. Doh.gif
Have the same problem - thought it was me but perhaps not.To add to the above.1. Pre - TO. Select LNAV on MCP - it arms {white on FMA}2. Post TO. LNAV engages correctly {green on FMA} but LNAV light on MCP extinguishes.3. Climb/Cruise. LNAV remains engaged {green on FMA} and follows correct route - LNAV MCP light remains out4. At any stage - press LNAV on MCP: LNAV disengages and AP reverts to CWSR5. Press LNAV again and LNAV re-engages and reverts to normal operation.As with the OP could not find this in FCOM or tuuorial so perhaps some of our experts could advise as they do not see it- is it something in my NGX set up?John Rooum
John it's comforting to know that someone else is having this issue as well, I just wish we could get someone from the PMDG team to give their take on it though.Devin Mack

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Same problem here (since SP1). LNAV mode _is_ active, but not lit. Switching LNAV off and on again during flight usually brings it back.Regards,Jörn

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I have the same problem, I noticed, thought it didn't bother me much, that if I engaged both VNAV and LNAV on the ground, that sometimes after I press TOGA, LNAV would extinguish.I would usually repress the button after takeoff, before I engage AP, but that would sometimes disengage VNAV (as I remember!). In the end, a click here and there would solve the "situation".But: sometimes it all went normal, 2 are on, two are kept on, and I only press AP.The situation I was testing was a saved flight from EGKK to LOWI, always the same config, and I always take care that I have right configuration on takeoff, along with correct trim and following the FD anyway possible, usually between 15 and 20 degree up. With the exactly same procedure, sometimes it happens and sometimes not. Maybe I am missing something, but I think not.

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