ATC Issues A place where pilots may enter the 'lions den' that is Air Traffic Control in complete safety and find out the answers to all those obscure topics which you always wanted to know the answer to but were afraid to ask.

IDENT

Old 1st Feb 2019, 09:38
  #21 (permalink)  
 
Join Date: Jan 2004
Location: London
Posts: 647
Received 6 Likes on 3 Posts
Originally Posted by His dudeness
Just out of interest: its almost exclusively used in the UK - is the UKs radar environment so much different from the others ? Never had to squawk ident out of Amsterdam or Frankfurt or other real busy airports. Or is it just one of these things that always had been done ? Should not Mode S give you all the required info ?


Lots of info in Mats part 1 about how to identify via Primary, mode A and mode S.

Mats part 1, chapter 6, section 4 onwards


Mode S ident would rely on the controller correlating the Mode S address from the radar with the Mode S address from the flight plan and that’s not present on the flight progress strip.
Del Prado is offline  
Old 3rd Feb 2019, 04:42
  #22 (permalink)  
 
Join Date: Sep 2006
Location: Bournemouth
Posts: 54
Likes: 0
Received 0 Likes on 0 Posts
I appreciate what the rules are regarding the use of the squawk ident feature however, as an en route controller on a high workload congested r/t sector, it does actually help when the pilots are patient and if they have not been able to check in for some time, a few pilots hit the ident button as an unwritten rule that they are listening and waiting. It is appreciated as calling on will just either block my readback (which is necessary) or block another pilot also trying to check on. With traffic increasing, I have noticed the r/t discipline of more foreign low cost crews think they are the only ones in the sky and I am afraid they are not.
Anyway, nothing to do with the departure aspect however I can answer that the reason for the request to ident is to do with the correlating the flight plan with the radar track and hence it is identified. For this reason, you should not be asked to change ssr with ident as the lag in the system could actually correlate the flight with another flight plan and we would get the wrong callsign and destination among other things incorrect with radar track.
Hope this helps.
Conspiracy Theories is offline  
Old 3rd Feb 2019, 16:00
  #23 (permalink)  
 
Join Date: Feb 2009
Location: in a TCU
Posts: 558
Likes: 0
Received 0 Likes on 0 Posts
It doesn't bother me at all but I'm used to make fool of them asking if there is any particular reason for squawking ident.
I do usually suggest to call maintenance on arrival to fix their transponder
blissbak is offline  
Old 3rd Feb 2019, 16:31
  #24 (permalink)  
 
Join Date: Nov 2012
Location: Earth
Posts: 33
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Del Prado




Lots of info in Mats part 1 about how to identify via Primary, mode A and mode S.

Mats part 1, chapter 6, section 4 onwards


Mode S ident would rely on the controller correlating the Mode S address from the radar with the Mode S address from the flight plan and that’s not present on the flight progress strip.
It is not necessary to correlate the Mode S address only the aircraft identification feature (callsign input into FMS) with the FPL callsign on the FPS. From my experience it is only NATS units that use the ident feature to identify a/c on departure.

Is it the case that the callsign displayed on NATS systems is derived from mode A by callsign conversion rather than displaying the mode S flight ID? Maybe this is why the ident is needed?
Pringle_ is offline  
Old 3rd Feb 2019, 19:30
  #25 (permalink)  
 
Join Date: Mar 2001
Location: etha
Posts: 300
Likes: 0
Received 0 Likes on 0 Posts
NATS units do not currently show Mode S correlations, all code/callsign conversions come from Mode A.
zonoma 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.