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

B737 VOR/LOC

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

B737 VOR/LOC

Reply

Old 13th Jul 2018, 15:36
  #1 (permalink)  
Thread Starter
 
Join Date: Oct 1999
Posts: 1,009
B737 VOR/LOC

hi

does VOR/LOC after engaging possibly disengage due to the FCC's not being able to hold the signal and subsequent a/c tracking e.g super strong crosswind?
if so what is the transition point?

regards

pin
Pin Head is offline  
Reply With Quote
Old 14th Jul 2018, 14:07
  #2 (permalink)  
 
Join Date: Jan 2000
Location: FL410
Posts: 704
Never heard of it
Skyjob is offline  
Reply With Quote
Old 14th Jul 2018, 15:30
  #3 (permalink)  
 
Join Date: Apr 2008
Location: Nearer home than before!
Posts: 371
737NG tends to dive onto the VOR/LOC a bit fast and often ends up with a double turn, so if anything the software is a bit "keen" rather than slow to intercept. All FGS have a limit to how much crosswind they can cope with, and the exceedence is to drop out. The 737 is , to be fair, pretty game for it and not weak in this aspect.
RVF750 is offline  
Reply With Quote
Old 15th Jul 2018, 04:26
  #4 (permalink)  
Thread Starter
 
Join Date: Oct 1999
Posts: 1,009
Ok great.

felt a dodgy signal and a strong x wind the other day that made me think.
Pin Head is offline  
Reply With Quote
Old 17th Jul 2018, 08:09
  #5 (permalink)  
 
Join Date: Feb 2013
Location: 60 north
Age: 54
Posts: 446
Pin Head

Interested in Your " Aha?" event. What happened?
I have had many a dodgy intercept at rather high speed and xwind, but the old 737 hound, once in VOR/LOC, does not let go!!
Full deflection and flashing amber , max bank and a few S turns and it track that Lorens Beam with no concern for the consequences!
( I have not checked , but and I do not recall any disconnect criteria)

Even more so with the GS , that being the standard 3 degree or the false 6 or even 9 degree.
Also remember it is rate driven, ie the quicker the LOC or GS movement, the quicker the FD movement!
Had chap chase the 60 degree LOC lobe on base int Bremen ages ago, ATC got a bit crossed.

Anyway ,what was the specifics of your event if I may ask?

Last edited by BluSdUp; 17th Jul 2018 at 08:11. Reason: Splelling
BluSdUp is offline  
Reply With Quote

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