Questions If you are a professional pilot or your work involves professional aviation please use this forum for questions. Enthusiasts, please use the 'Spectators Balcony' forum.

Cruise CG B737NG

Old 10th Aug 2016, 02:43
  #1 (permalink)  
Thread Starter
 
Join Date: Oct 1999
Posts: 1,050
Likes: 0
Received 0 Likes on 0 Posts
Cruise CG B737NG

I remember there was a formula for the cruise CG by subtracting an amount ofF the take off CG on the B767 but is there one for the NG please?

Kind regards

Pin
Pin Head is offline  
Old 10th Aug 2016, 13:33
  #2 (permalink)  
 
Join Date: Mar 2001
Location: I wouldn't know.
Posts: 4,497
Likes: 0
Received 0 Likes on 0 Posts
We used to have a table with the delta CG depending on initial fuel load and remaining fuel for that in our QRH for the purpose of updating the CG around once every hour in cruise. However it was removed at some point as the difference in performance calculation was negligible.

Depending on fuel load the CG can move backwards and forward in one flight, it is not a linear relationship between CG and fuel on board.
Denti is offline  
Old 10th Aug 2016, 22:38
  #3 (permalink)  
 
Join Date: Apr 2012
Location: In Space
Posts: 683
Likes: 0
Received 0 Likes on 0 Posts
My company uses MACTOW - 4 for CRZ CG. Boeing said the worst case scenario is a 4% change in CG. This will change the margin for OPT/MAX cruising levels.
B737900er is offline  
Old 11th Aug 2016, 01:50
  #4 (permalink)  
Thread Starter
 
Join Date: Oct 1999
Posts: 1,050
Likes: 0
Received 0 Likes on 0 Posts
Thank you.

Is that written down anywhere in an official controlled Boeing document.

Last edited by Pin Head; 11th Aug 2016 at 04:53.
Pin Head is offline  
Old 11th Aug 2016, 09:32
  #5 (permalink)  
 
Join Date: Jul 2007
Location: Germany
Posts: 1,019
Likes: 0
Received 6 Likes on 1 Post
I agree with Denti's point that it is hardly worth the bother. The usual way you check the OPT/MAX is from the FMC. But if you are in ECON and then enter the exact same mach number you will get quite different OPT/MAX numbers. Enter a higher or lower MACH and you can massage the margin whichever way you want, which may or may not be a good thing, depending on whether you know what you are doing.
lederhosen is offline  
Old 14th Aug 2016, 21:14
  #6 (permalink)  
 
Join Date: Apr 2012
Location: In Space
Posts: 683
Likes: 0
Received 0 Likes on 0 Posts
Boeing release a magazine called Aero and thats where you can find some interesting topics.
B737900er 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.