hey guys,i have a realy Serious problem with descends and climbs:

asume i'm in FL220 and there is an altitude CNSTR at waypoint ABC,FL200,asume control told me to decend to FL 100,before wypoint ABC,if i wanted to hold automaticly FMC SPD and FMC VS in my descend and PAYing attention to ALT CNSTR(i mean is decend to FL 200,after ABC,continue his descend automaticly to FL120)what i have to do?(and the same story about climbing like this)

Thank you realy so much for reading and answering!

Dear ?

 

If I understand you correctly, you want to initiate your descent, cross ABC at FL200 and then continue down to FL100? In that case I would use LVL CHG with the ALT window selected to 20000 whilst remaining in LNAV or HGD SEL as needed. Passing ABC I would wind down the ALT to 10000. I would NOT use VS.

 

If you are with ATC I would suggest using the MCP rather than going heads down, however you could program ABC at .73/FL200 and then BBC at 240/10000 and fly it in LNAV/VNAV which would give you the appropriate level off until ABC. Keep in mind, if your 1s and 0s don't add up (i.e. you ask the FMC to perform miracles) it will not fly it correctly. The NGX unlike most FSX aircraft before it, demands pilotage/airmanship.

 

It would be the reverse for the climb......

hi lasnubes,my first question is how to descend with LNAV/VNAV like what you said above,and the second is HOW to LVL CH with FMC SPD?not with idle thrust and i think you didn't understood it well,imean is Selectin FL 120 in MCP,Descend to 200 at ABC(without changing in MCP ->)then descend to 120 after passing ABC,'cause it was possible in Airbus's glareshield with some Ultra easy tricks

thank you

another question:when i'm in final ils approach,VNAV disengages and FMS shows a message like this:"SELECT APPROACH VREF",what about this captain?if i want to have the FMC speed orders even in final approach,what i have to do sir?

^^^Read the first tutorial provided by PMDG!

On CDU there's a button, the very first one "INT/REF". Click on it and page will display where on the right side you'll find final approach flap+speed configurations.

Regarding LVL CH - It uses Idle thrust for descent and maintains target speed through pitch, just like OP DES on the bus or IDLE CLAMP on the MD11.

 

As others have mentioned, have a read of the FCOM and provided tutorials. It will save you a lot of frustration.

hi killkenny1,i know Where the exactly APP PREF is,i was in that page and i gave this message dude!

and for flex1978,i know what does LVLCH exactly do,if you read the thread,i need a feature that descend or climb with FMC controling speed and VS,not with least and last of them!

Thank you guys

If think we are all trying to understand, your not exactly making it clear..

another question:when i'm in final ils approach,VNAV disengages and FMS shows a message like this:"SELECT APPROACH VREF",what about this captain?if i want to have the FMC speed orders even in final approach,what i have to do sir?

 

Regarding the "SELECT APPROACH VREF", you have to select whether you want to land with FLAPS 15, 30 or 40 and then enter it in the "FLAP/SPD"

Whenever there are any altitude constraints in your flights plan during descent the FMC will calculate a path descent, if there no altitude constraints then the FMC uses speed descent. Basically FMC path descent uses pitch and no speed control, whilst descent speed uses thrust like level change but no pitch control.

 

You can delete any altitude constraints in your descent to continue descending past your altitude constaints.

 

If ATC asks you to hold at an altitude before your altitude constraint then there is a chance you could over shoot your alttude constraint and will get a CDU msg 'unable to reach next altitude constraint' or something like that.

The FMC will try to increase the descent rate but sometimes that overshoot becomes inevitable, check your decent deviation bar and check how high you are according to the altitude your aircraft is suppose to be at (descent page).

 

To resolve this you could remove waypoints to make your route shorter, this is often requested by real crew to resolve this sort of problem.

 

Or you could use level change, descent with speed brakes and watch your deviation bar centre.

 

If this doesn't sort the problem out then consider holding at a waypoint in your flightplan before or after your altitude constraint or in any circumstances to resolve a too high decent.

thank you photons,i wish i had a great a-320 instead of a pmdg 737 ng,'cause airbus's mcp is very very easier,smaller,smarter and more user friendly than 737NG,for example above thread could be solved with just one click in airbus!

As someone who knows airbus philosophy in great depth I'm wondering what this one click is you are talking about. Not being funny here, just wan't to understand exactly what you are going on about. Care to explain?

 

Thanks

Dear ?

 

I already have a great 737 NGX and am in no hurry for anything else, I'm still learning and have a long way to go before I exhaust the NGX's capabilities.. That said I'm reminded of a quote.... "Boeing should design airplanes, Douglas should build them. The French make wonderful cheese"

 

I'd suggest a few hours with the extensive documentation provided. Another couple flying both tutorials. After that I stand ready to assist further.

sorry FLEX1978,but i am a real life A-320 pilot with 3500 hours on this plane and i'm talking about ALT manage,it pays attention to ALT CNSTR and manages VS and SPD manage holds MCDU's desired speed!i think you have to READ your philosophyagain!

lasnubes,i just say airbus's story is very easy and friendly!and airbus's order and delivery was much more than boeing's since 2000!

hi killkenny1,i know Where the exactly APP PREF is,i was in that page and i gave this message dude!

But did you select one?