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

Airbus 330 Landing with Slats or Flaps Jammed

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

Airbus 330 Landing with Slats or Flaps Jammed

Old 5th May 2023, 08:50
  #1 (permalink)  
Thread Starter
 
Join Date: Sep 2008
Location: Munich
Age: 41
Posts: 9
Likes: 0
Received 0 Likes on 0 Posts
Airbus 330 Landing with Slats or Flaps Jammed

Hello to everyone,

why should I disconnect the A/THR in the overweight landing case to follow vls reduction as surfaces extend? What is the reason behind it? The lowest selectable speed is vls? Isnít it? Is it better thrust control to avoid to undershoot vls?

Thanks for any hint
Kind regards


nr1chris is offline  
Old 5th May 2023, 09:17
  #2 (permalink)  
 
Join Date: May 2010
Location: Austria
Age: 47
Posts: 79
Likes: 0
Received 1 Like on 1 Post
If you’re really heavy VFE CONF1 is below VLS and your thrust won’t let you fly to flaps 1 speeds.
8314 is offline  
Old 5th May 2023, 22:10
  #3 (permalink)  
 
Join Date: Feb 2001
Location: Milkway Galaxy
Posts: 240
Likes: 0
Received 0 Likes on 0 Posts
LANDING WITH SLATS OR FLAPS JAMMED
......If VLS is greater than VFE NEXT (overweight landing case), the FLAPS lever can be set in
the required next position while the speed is reduced to follow VLS reduction as surfaces
extend. The VFE warning threshold should not be triggered. In this case, disconnect the
A/THR. A/THR can be reengaged when the landing configuration is established.
For A 330-300s which I know WV, Structural MTOW is 233t, and always Vls was <VFE NEXT, that is in normal flap/slat extension
However when one of those fail to extend normally, Vls (for actual configuration) may be greater than VFE NEXT,
In this case, even on PFD shows Vls > VFE NEXT, you can extend available configuration because VFE NEXT assumes normal extension and in this case it is incorrect. Therefore, although Vfe (barber pole) will show immediately on PFD for selected lever position and actual speed will be above Vfe, OVERSPEED Warning will not be triggered immediately; this is because OVERSPEED Warning only starts when configuration is physically extended. Besides, OVERSPEED triggering speed will change depending on failed part vs. extended part combination. During this time gap if selected speed is reduced as following dropping Vls (which relies on actual configuration) by A/T, there is no problem, no need to disconnect A/T. However if A/T remains sluggish to follow dropping Vls, this may cause OVERSPEED warning and in this case it is advised to disconnect A/T and handle thrust manually till the configuration is established

Last edited by JABBARA; 6th May 2023 at 09:17. Reason: words
JABBARA is offline  
Old 7th May 2023, 12:40
  #4 (permalink)  
Thread Starter
 
Join Date: Sep 2008
Location: Munich
Age: 41
Posts: 9
Likes: 0
Received 0 Likes on 0 Posts
Thank you Jabbara. Thatís a really good explanation. I really appreciate.
nr1chris is offline  
Old 7th May 2023, 19:56
  #5 (permalink)  
 
Join Date: Feb 2001
Location: Milkway Galaxy
Posts: 240
Likes: 0
Received 0 Likes on 0 Posts
nr1chris I do thank you,
Sometimes I consider my non-native English may not be so clear to explain what I want to say
Take care, happy landings

Jabbara
JABBARA 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.