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fushi

PMDG North Pole flight

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Captain,On my flight (CYMX - UFX - N7000.0/W074 00.0 - N89 30.0/W074 00.0 - N89 30.0/E106 00.0 - N70 00.0/E106 00.0 - ZBK - ZBAA), I have couldn't delete the discontinuity as below:discon_PMDG.jpgWhat was the cause of the trouble? How can I delete this discontinuity?Sioncerely,Kan-ichiro Fushihara

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Hi Kan-ichiroHow did you tried to delete the discontinuity?Normally you shoud be able to "upselect" the waypoint after the discontinuity.(press the LSK next to the waypoint [N70E160 in your case] to select the waypoint into the scratch pad, then press the LSK adjacent to the discontinuity)The discontinuity should now be closed.I hope this helps.Best regardsDaniel

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Hi Daniel.Thank you for your kind reply.Although I have done as you said, the discontinuity still exist as before.Sincerely,Kan-ichiro Fushihara

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You are flying very close to the North Pole, if I recall such flights could not be handled properly under FS9 and/or FSX (don't recall details), why don't you keep a bit further away from the North Pole?

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hmmm.. too bad.Maybe it's a problem with FS limitations?I hope someone else can help you.RegardsDaniel

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You are flying very close to the North Pole, if I recall such flights could not be handled properly under FS9 and/or FSX (don't recall details), why don't you keep a bit further away from the North Pole?
This has happen on the CYMX RWY 06 which is not close to the North Pole.Sincerely,Kan-ichiro Fushihara

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Hi Kan-ichiro,I think your problem is the earlier way points, you have two N90 waypoints, when obviously there is only one north pole. If you really want to have a waypoint at the exact Northpole, despite known issues with FSX, then fair enough, but trying to use two of them is just asking for trouble. Regards,Paul Smith.

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Hi Paul,As I described on the first line, the N90 isn't N90 00.0 but N89 30.0. The North pole is the middle of 60NM between N90W074 and N90E106.Sincerely,Kan-ichiro Fushihara

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Well try deleting n70e106 and adding ZBK to the discontinuity.Just check its not just n70e106 mucking you up.Richy

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Well try deleting n70e106 and adding ZBK to the discontinuity.Just check its not just n70e106 mucking you up.Richy
Thanks, I have already done so to try this flight.I would like just to know the cause of this trouble. There isn't this trouble on the same circumstances of the LVLD 767X PANC - EFHK flight as below:discon.jpgSincerely,Kan-ichiro Fushihara

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There isn't this trouble on the same circumstances of the LVLD 767X PANC - EFHK flight as below:
I don't exactly see this as being the "same" situation. Clearly in this case it shows N89, not N90. I bet there will be a huge difference between N89 and N90.

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Kan-ichiro Hit the CLR key and then the LSK next to the FMC DISC. Hope this helps!!

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Kan-ichiro Hit the CLR key and then the LSK next to the FMC DISC. Hope this helps!!
Thanks,I have tried as you said: however, it doesn't work.Sincerely,Kan-ichiro Fushihara

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I don't know about your FMC trouble to be honest, but you may find this post interesting:http://forums1.avsim.net/index.php?showtop...;hl=north++poleCheersRudy
Thanks.It said "MSFS has a Polar Wall at N89.30. If your route goes above 89.30, you'll have to do some fancy driving, but it can be done. "; however, I haven't recognized the Polar Wall on the FSX.Sincerely,Kan-ichiro Fushihara

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I've had route discos I couldn't delete either on normal flights. Usually when adjusting a STAR or IAP. I never knew why it happened, although I didn't pause to really look and see if it was something I was doing wrong, but it happened enough that I didn't feel like it was me.Only happens in the 744 (FS9), not the 737NG or others I have like that.

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Not sure what else you could try now.Maybe using something else to build the flightplan and making a custom waypoint instead of the n70 waypoint and seeing if that works.Sorry I couldn't be of more helpRichy

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something different: How can there be 60 nm between 90N74W and 90N106E? It's exactly the same point. Or am I missing something here?Tom

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something different: How can there be 60 nm between 90N74W and 90N106E? It's exactly the same point. Or am I missing something here?Tom
I have said before:>Hi Paul,>As I described on the first line, the N90 isn't N90 00.0 but N89 30.0. >The North pole is the middle of 60NM between N90W074 and N90E106.Sincerely,Kan-ichiro Fushihara

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I have said before:>Hi Paul,>As I described on the first line, the N90 isn't N90 00.0 but N89 30.0. >The North pole is the middle of 60NM between N90W074 and N90E106.Sincerely,Kan-ichiro Fushihara
Hi Kan-ichiro Fushihara,Real life Boeing FMC's have issues near the North Pole, plse read http://www.boeing.com/commercial/aeromagaz...v_by_model.htmlSo maybe an omission in the PMDG progamming might cause this hick up.Also check out http://williams.best.vwh.net/avform.htm#CrsIn short: near polar flights are practically impossible/difficult to compute due to A) fast changing heading references, and :( some trigonomical functions approaching infinity near 90 degrees N/SRegards,Willem

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Dear Willem,Thank you very much for your valuable information. I have to study it.

In short: near polar flights are practically impossible/difficult to compute due to A) fast changing heading references, and :( some trigonomical functions approaching infinity near 90 degrees N/S
Although I have intentionally avoided to make a waypoint with the North Pole itself (N90 00.0), I understand clearly LNAV controlled navigation of the PMDG 747-400X is very unstable near the Pole. It seems that I have guessed right.Sincerely,Kan-ichiro Fushihara

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Dear Willem,Thank you very much for your valuable information. I have to study it. Although I have intentionally avoided to make a waypoint with the North Pole itself (N90 00.0), I understand clearly LNAV controlled navigation of the PMDG 747-400X is very unstable near the Pole. It seems that I have guessed right.Sincerely,Kan-ichiro Fushihara
You are welkom,You don't have to study the trigonometry behind the FMC calculations: you can reduce the whole matter by asking yourself this (Zen) question:- What is your heading when you are directly over the North Pole?When you find the answer, you can appreciate the problems involving FMC track calculationsGood Luck and happy landings.Willem

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