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FMC Issues On Pmdg MD-11  
User currently offlinexero9 From Canada, joined Feb 2007, 154 posts, RR: 0
Posted (4 years 7 months 5 days 9 hours ago) and read 11831 times:

Afternoon everyone,

I've had this add-on from PMDG since the day it came out, and while I'm an enthusiast, I know very little about it except lower flaps to 22 and give it full throttle to get it off the ground  

Well since I've started flight training, I'm actually a little smarter now about certain things, such as the ZFW and ZFWCG parts of it, though obviously still don't know how to properly fly a plane such as the MD-11. One of the biggest problems I'm having with it is the FMC. I had this same problem with the 747 FMC and I'm obviously just missing something, but I can't figure it out even after going through their tutorial (It works fine for the MD-11 tutorial, but as soon as I try a different route it doesn't work).

What I try to do for example, is set up a route from CYYZ to KPHL, so on the F-PLN INIT page I put it CYYZ/KPHL for the from/to field and click *INSERT

If I push the F-PLN button, I get a list of waypoints which my understand is the aircraft will follow.. This is where it gets tricky. In the tutorial, it says to select the airport line and should bring up a screen where you can select a SID, then on the right side if you select the runway you are taking off from, it will narrow down the SIDs you can pick from, and so I do this but no matter which one I pick, it goes back to the flight plan and has a few new entries but then has "F-PLN DISCONTINUITY". At this point, my flight plan is completely out of wack and I can't reset it without resetting the game.

Can someone perhaps try to fill in the blanks on what I'm missing here? I don't quite understand what the SIDs are, my only guess is that they're approach/departure points as the plane leaves the airport.

Thanks for any help anyone can provide!

And if I wasn't very clear about something, let me know and I'll try to explain it a bit better.

10 replies: All unread, jump to last
 
User currently offlineLuftfahrer From Germany, joined Mar 2009, 1033 posts, RR: 1
Reply 1, posted (4 years 7 months 5 days 7 hours ago) and read 11807 times:

Quoting xero9 (Thread starter):
"F-PLN DISCONTINUITY"


It is normal to have that when entering SIDs/STARs, in order to clear it, press the CLR button + the LSK (Left Soft Key) at the place of the F-PLN DISCONTINUITY.

Quoting xero9 (Thread starter):
I don't quite understand what the SIDs are, my only guess is that they're approach/departure points as the plane leaves the airport.

Not exactly points, much rather a route that the airplane is going to fly along immediately after departure... for more details, wiki is quite useful... http://en.wikipedia.org/wiki/Standard_Instrument_Departure



'He resembled a pilot, which to a seaman is trustworthiness personified.' Joseph Conrad
User currently offlineFlybaurLAX From United States of America, joined Oct 2008, 638 posts, RR: 0
Reply 2, posted (4 years 7 months 5 days 7 hours ago) and read 11807 times:

I'm not too familiar with the MD FMC, and it's been a while since I used FS, but what the route discontinuity is telling you is that there's a break in the flight plan. The original flight plan will create certain waypoints, but when you add a SID (Standard Instrument Departure), it adds extra waypoints in. What you need to do is find a common waypoint, or one that will take you the most direct from the transition waypoint to the next waypoint on your flight plan. I know with Boeing FMCs you just click on the next waypoint after the disco, and then drop it in where the boxes are for the disco, and then you get rid of that. Look at the map on the nav display as you do this to verify that the routing makes sense. I'm sure someone more proficient in the MD FMC can help out more, but I'll look into it when I get back form work. I hope this helps.


Boilerup! Go Purdue!
User currently offlinecpd From Australia, joined Jun 2008, 4879 posts, RR: 37
Reply 3, posted (4 years 7 months 5 days 4 hours ago) and read 11781 times:

You need to find the common waypoint after the SID so that the two can join correctly, perhaps get rid of superfuous waypoints in between those two and then clear away the F-PLN DISCONTINUITY with the CLR button then the LSK beside the F-PLN DISCONTINUITY message.

Same deal with entering STARS (standard terminal arrivals).


(note to staff, the capital letters are used to replicate the FMC message, not for shouting). The MD-11 FMC is one of the nicer ones actually - it is fairly intuitive and fast to operate.


User currently offlinexero9 From Canada, joined Feb 2007, 154 posts, RR: 0
Reply 4, posted (4 years 7 months 5 days 3 hours ago) and read 11779 times:

Thanks for the info.

Because I don't know which points join together, is there any way to find out without trial and error?


User currently offlinecpd From Australia, joined Jun 2008, 4879 posts, RR: 37
Reply 5, posted (4 years 7 months 5 days 3 hours ago) and read 11776 times:

Quoting xero9 (Reply 4):
Because I don't know which points join together, is there any way to find out without trial and error?

Yes, on the glareshield, click the MAP or PLAN button (can't remember which one it is at work). This will show you the plan on the HSI (horizontal situation indicator) and the display will move along with the scrolling you do on the FMC display. F-PLN DISCONTINUITY will be shown as a line that is broken - IE, the line will not continue to the next section of line. Look at that and delete waypoints that are not needed based on what you see.

So if you are flying into YSSY (Sydney) and doing one of the BOREE STARS, and your flight plan in the FMC has waypoints up to BOREE, but also includes a few after it - delete the ones after BOREE, and also delete the first instance of BOREE as well - since BOREE will also be in the STAR itself. Then clear the F-PLN DISCONTINUITY.

So when you are tracking over BOREE, you'll then flow straight into the SID. I'll give you a flight plan to try shortly when the site I reference comes back online.

I presume you know how to do the descent procedure using the FMC? Or will you be taking instruction from ATC?

[Edited 2010-03-22 18:33:06]

User currently offlinexero9 From Canada, joined Feb 2007, 154 posts, RR: 0
Reply 6, posted (4 years 7 months 4 days 15 hours ago) and read 11757 times:

Thanks for your help cpd 

I will give that a shot when I get home this afternoon, hopefully it'll make more sense to me now.

As for the descent procedure.. No.. I can't even get it to follow proper altitudes set by the FMC for different legs of the flight. I was going to follow up with that once I figured out how to program the route properly.

I can post specifically what I'm doing once I get home, or if you can remember off the top of your head that would be great too.

Thanks again, I appreciate it. I felt like I wasn't getting my monies worth with my lack of being able to use it. I bought the 747, MD-11, and J41 from PMDG and I can't fly any of them :P


User currently offlineFlybaurLAX From United States of America, joined Oct 2008, 638 posts, RR: 0
Reply 7, posted (4 years 7 months 4 days 10 hours ago) and read 11741 times:

Quoting xero9 (Reply 6):
Thanks again, I appreciate it. I felt like I wasn't getting my monies worth with my lack of being able to use it. I bought the 747, MD-11, and J41 from PMDG and I can't fly any of them :P

It's kind of a steep learning curve at first, but you'll figure it out with some time, and then you'll enjoy it. Don't let it discourage you.



Boilerup! Go Purdue!
User currently offlinexero9 From Canada, joined Feb 2007, 154 posts, RR: 0
Reply 8, posted (4 years 7 months 4 days 8 hours ago) and read 11727 times:

Quoting FlybaurLAX (Reply 7):
It's kind of a steep learning curve at first, but you'll figure it out with some time, and then you'll enjoy it. Don't let it discourage you.

I do keep trying. I come back, try to learn a bit more, then put it on hold. Rinse and repeat!

I finally decided to ask for help on here, because if anyone in the world can figure this out, it's the A.net guys  


User currently offlinecpd From Australia, joined Jun 2008, 4879 posts, RR: 37
Reply 9, posted (4 years 7 months 4 days 7 hours ago) and read 11725 times:

Flying the descent is a bit easier. Before T/D is shown on the HSI (Top of descent) - set the altitude hold selector to 0 - and once you get to T/D - you should start to descend. The FMC has a overshoot / undershoot display you can reference that tells you if you'll be too high or too low. Use this as a guide - and be ready to make amendments if needed.

Autopilots are not something you just allow to do what they want - if you tell them to do something silly, they'll do exactly that. Must be carefully monitored at all times.


User currently offlineandysim From United Kingdom, joined Nov 2009, 9 posts, RR: 0
Reply 10, posted (4 years 6 months 4 weeks 1 day 9 hours ago) and read 11577 times:

Pmdg did a good job on thier FMC as you would expect from thier products and even after a year of flying I still learn new things. You could try bobs tutorial on youtube. http://www.youtube.com/watch?v=mErHLBH3fj8. It really is a sim in a sim lol.


Good luck.


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