FMS : How to set a 'below' or 'above' target altitude?

[roland_lfor 78]

Hi,

 

On some SID/STAR procedures I can see that such target altitude exist.

 

They are displayed in FPL pages with an up or down arrow prefix, and as far as I know, they are correctly handled by the VNAV autopilot function.

 

Question is: how can I set one myself to a waypoint from the FPL pages and menus?

 

Thanks and sorry if it has been already asked.

[praga 0]

Just click on RIGHT button in FPL page. Then you can set altitude and how many miles before that point you want to be at that altitude.

[roland_lfor 78]

Thanks, you were so fast :wink:

I'll try asap tonight.

[roland_lfor 78]

Well, I'm in front of the FMS now and a little bit lost:

- With RIGHT key I can enter the wished altitude for sure, what about "how many miles before"?

 

There is no '/' char to separate inputs

[roland_lfor 78]

Ok, did my homework with the systems description doc.

It seems that before/after WPT distance can be set on VNAV page, 2nd field on the TO line.

Will try tomorrow.

[pete_auau 570]

http://www.airline2sim.com/ 

 

well worth the puchase

[el_kab0ng 29]

Seriously? You answer a question by promoting another product? Bad form, man.

[ckyliu 994]

"At or above" and "at or below" altitude restrictions cannot be programmed in to the Universal FMS by the user, although they are included with some SID/STAR procedures. This is as per the real aircraft.

[roland_lfor 78]

@ckyliu

It seems that you are wrong as the method found in the systems description is effective. I've checked that the VNAV waypoint can be set with a + or - distance value in the field prior to the altitude target, so that sounds good.

 

I still have to confirm it's correctly understood by the flight director in various conditions, and be sure of the meaning of +/- input selector. Logically speaking a positive value should mean 'after' and negative 'before' the waypoint so we reach the equivalent of below / above.

 

It's a good think for me to go back in the documentation as I missed several major FMC capabilities. For example I was still flying the ILS intercept in the old fashion, switching from FMC source to HDG, then NAV/ILS source, but FMC can handle the whole thing in a more efficient manner -_-

I had missed also the ILS auto-tune function as well, can you believe it :o

 

Always a lot to learn on my side :rolleyes: 

[pete_auau 570]

Seriously? You answer a question by promoting another product? Bad form, man.

 

Yea why not  if  you want  to learn  how to fly  the q400   than this is  product  to get.

[roland_lfor 78]

I still have to confirm it's correctly understood by the flight director in various conditions, and be sure of the meaning of +/- input selector. Logically speaking a positive value should mean 'after' and negative 'before' the waypoint so we reach the equivalent of below / above.

 

I confirm this is perfectly working as expected  :smile: