Go Back  PPRuNe Forums > Flight Deck Forums > Tech Log
Reload this Page >

FMGC-populated altitudes in the Flightplan...

Tech Log The very best in practical technical discussion on the web

FMGC-populated altitudes in the Flightplan...

Old 7th Dec 2023, 07:41
  #1 (permalink)  
Thread Starter
 
Join Date: Aug 2011
Location: Portugal
Age: 59
Posts: 48
Likes: 0
Received 0 Likes on 0 Posts
FMGC-populated altitudes in the Flightplan...

Assuming the MCDU is being used to enter a route, Weight / Fuel have been filled, INIT A has been filled with a Cruise Alt of, say, FL280, can the FMGC populate waypoints along the route with Forecast Alts above that Cruise Alt (i.e.: at a given waypoint reading ----/FL360 ) ?

Thank you
jcomm is offline  
Old 7th Dec 2023, 11:22
  #2 (permalink)  
 
Join Date: Feb 2009
Location: Austria
Posts: 701
Likes: 0
Received 2 Likes on 1 Post
For this, You could try the Step Alt function via the vertical revision (right hand line select keys) of the FPL page. That way, You can define step climbs either at desired waypoints or at optimum positions. Depending on weight, outside conditions and cost index, the latter method may well result in "no optimum" if the FMS calculates the lower level to be better.

I have been advised to request the enroute wind on the INIT A before entering a flight level on the same page to obtain wind data for more levels, which is said to make the OPT FL calculation a bit more realistic.
Tu.114 is offline  
Old 7th Dec 2023, 14:44
  #3 (permalink)  
Thread Starter
 
Join Date: Aug 2011
Location: Portugal
Age: 59
Posts: 48
Likes: 0
Received 0 Likes on 0 Posts
Thank you for your answer Tu.114

Yet, my question is more about it being possible, in any of the software versions of the A320s FMGCs / MCDUs to have a situation such that when the crew inputs the cruise level in INIT A and then starts filling up the route, using SID / Enroute / STAR / ARR, the waypoints listed can show expected altitudes higher than that Cruise Level?
jcomm is offline  
Old 7th Dec 2023, 14:55
  #4 (permalink)  
 
Join Date: Jan 2022
Location: Miami
Posts: 61
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by jcomm
Thank you for your answer Tu.114

Yet, my question is more about it being possible, in any of the software versions of the A320s FMGCs / MCDUs to have a situation such that when the crew inputs the cruise level in INIT A and then starts filling up the route, using SID / Enroute / STAR / ARR, the waypoints listed can show expected altitudes higher than that Cruise Level?
I have not seen that in any boxes at two different major 121 US airlines. One which flew historically brand new airplanes, one with older Airbus.

Step Altitude would be the way to do this, the MCDU deals with zeros and 1's, and "hard data". Cross ABC at 10,000. At XXX waypoint, begin descent. Climb at 240 until further advised.

"Should, maybe, expect" it becomes harder to program those things.



321XLR is offline  
Old 7th Dec 2023, 16:09
  #5 (permalink)  
Thread Starter
 
Join Date: Aug 2011
Location: Portugal
Age: 59
Posts: 48
Likes: 0
Received 0 Likes on 0 Posts
Thank you 321XLR ,

jcomm is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.