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

A320 ALT-DCT LAW

Wikiposts
Search

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

A320 ALT-DCT LAW

Thread Tools
 
Search this Thread
 
Old 20th March 2016 | 13:25
  #1 (permalink)  
Thread Starter
 
Joined: Sep 2007
Posts: 36
Likes: 0
From: Ncise
A320 ALT-DCT LAW

G'day all,

Why does the Airbus FBW family reconfigure from ALT LAW to DIRECT LAW when the landing gear is selected down?

Many thanks...
olirindis is offline  
Reply
Old 20th March 2016 | 17:18
  #2 (permalink)  
 
Joined: Mar 2001
Posts: 4,563
Likes: 35
From: I wouldn't know.
There is no flare law in alternate law, which would make flaring kinda unintuitive. Some newer MSNs do have flare law in alternate law and do not necessarily switch to direct law with gear down...
Denti is offline  
Reply
Old 20th March 2016 | 23:53
  #3 (permalink)  
10 Anniversary
 
Joined: Jan 2016
Posts: 4,484
Likes: 711
From: UK
As denti said.
Flare law (in normal law) engages at around 50ft and pitches down so you have to actively pitch up slightly to flare during the landing. Giving it a "conventional" rather than a FBW feel.

In alternate law you lose that mode, so it changes to direct law to give a conventional feel.

Still feels different to a conventional aircraft though.
LlamaFarmer is offline  
Reply
Old 22nd March 2016 | 04:35
  #4 (permalink)  
20 Anniversary
 
Joined: Mar 2006
Posts: 2,633
Likes: 137
From: USA
Originally Posted by Denti
There is no flare law in alternate law, which would make flaring kinda unintuitive. Some newer MSNs do have flare law in alternate law and do not necessarily switch to direct law with gear down...
Do you have a reference for that? My company just picked up a new plane last week, and I haven't seen any manual revisions.
Check Airman is offline  
Reply

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



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

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.