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

Airbus Transponder Mode S Operation

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

Airbus Transponder Mode S Operation

Old 29th Jan 2008, 23:47
  #1 (permalink)  
Thread Starter
 
Join Date: Jan 2006
Location: UK
Posts: 16
Likes: 0
Received 0 Likes on 0 Posts
Airbus Transponder Mode S Operation

Call someone help with this please about the
AIRBUS TRANSPONDER MODE S OPERATION
After landing the TCAS selector is set to "Standby " and the ATCselector stays in "Auto" until parked on stand when it is then switched to "Standby" aswell.
The question is :
Do I have to leave the "assigned squawk" code on until on the stand or once taxing in can I set the squawk window to 2000 which is the company SOP or MUST I HAVE TO LEAVE IT AT THE "ASSIGNED SQUAWK" FOR THE MODE S TO SHOW THE CONTROLLER US TAXING TO THE GATE and then set it to 2000 ??
Thanks Guys
NO DELAY EXPECTED is offline  
Old 30th Jan 2008, 00:55
  #2 (permalink)  
 
Join Date: Nov 2004
Location: Stormy Peninsular
Posts: 153
Likes: 0
Received 0 Likes on 0 Posts
Just leave your squawk code until you've parked at the gate and set '2000' after engine shutdown. It can also be set in 'cockpit preparation' so there's really no rush in setting '2000'.

Hope that helps.
Chrome is offline  
Old 30th Jan 2008, 17:43
  #3 (permalink)  
The Bumblebee
 
Join Date: Jul 1999
Location: Inside the shiny tube.
Posts: 333
Likes: 0
Received 0 Likes on 0 Posts
Correct me if I am wrong but in AUTO mode, when on ground, the transponder is as good as being on standby. It gets the signals from LGCIU and if the ATC wants you to turn the transponder on it should be set to ON position.

So after landing does it really matter whether it is set to assigned code or 2000 (of course assuming ATC has not asked for it to be ON on the ground, as a good practice though I set it to 2000 after we park and when I put the transponder to STBY)?
DesiPilot is offline  
Old 30th Jan 2008, 18:05
  #4 (permalink)  
 
Join Date: Aug 2000
Location: Farnham, UK
Posts: 323
Likes: 0
Received 0 Likes on 0 Posts
With our outfit we switch from TA/RA (i.e. TCAS ON, TXPR ON) to XPDR (TCAS OFF, XPDR ON) after landing. This is maintained to the parking position and then as part of the shutdown checks we set 1000 and STBY.

Leaving the XPDR ON with assigned squawk means we display our callsign to ATC ground movement radar while taxiing. Setting 1000 apparently sets the transponder to display aircraft registration.

This then satisfies the needs of most airports using Mode S ground surveillance radar.

EGLL AIS
Heathrow Airport is equipped with an advanced surface movement radar utilising Mode-S.
1 Aircraft operators intending to use London Heathrow Airport should ensure that Mode S transponders are able to operate when the
aircraft is on the ground
2 Flight crew should:
Select XPNDR or the equivalent according to specific installation, AUTO if available, not OFF or STDBY, and the assigned Mode A
code.
From the request for push back or taxi whichever is earlier;
After landing, continuously until the aircraft is fully parked on stand
After parking the Mode A code 1000 must be set before selecting OFF or STDBY.
3 Flight crew of aircraft equipped with Mode S having an aircraft identification feature should also set the aircraft identification. This
setting is the aircraft identification specified in Item 7 of the ICAO ATC Flight Plan. The aircraft identification should be entered from
the request for push back or taxi, whichever is earlier, through the FMS or the Transponder Control Panel.
T'bug

Last edited by Thunderbug; 30th Jan 2008 at 18:42.
Thunderbug is offline  
Old 30th Jan 2008, 18:33
  #5 (permalink)  
PPRuNe supporter
 
Join Date: Dec 2003
Location: Planet Earth
Posts: 1,677
Likes: 0
Received 0 Likes on 0 Posts
Correct me if I am wrong but in AUTO mode, when on ground, the transponder is as good as being on standby. It gets the signals from LGCIU and if the ATC wants you to turn the transponder on it should be set to ON position.
I'm not a technician but I believe this to be absolutely correct.
Dream Land is offline  
Old 30th Jan 2008, 19:08
  #6 (permalink)  
 
Join Date: May 2001
Location: London,England
Posts: 1,388
Likes: 0
Received 0 Likes on 0 Posts
I'm not a technician but I believe this to be absolutely correct.
When on the ground and set to AUTO our transponders (Airbus 320 and 330) operate in mode S only and in all modes when in the air. Suspect it's the same for any modern mode S gear.
Max Angle is offline  
Old 31st Jan 2008, 04:26
  #7 (permalink)  
 
Join Date: Nov 2004
Location: Stormy Peninsular
Posts: 153
Likes: 0
Received 0 Likes on 0 Posts
When on the ground and set to AUTO our transponders (Airbus 320 and 330) operate in mode S only and in all modes when in the air.
True, so if one just leaves it on Auto after landing on the Buses, you should be able to comply with any ATC MSS requirement. Tried and tested personally in VTBS and WMKK.
Chrome is offline  
Old 31st Jan 2008, 05:33
  #8 (permalink)  
PPRuNe supporter
 
Join Date: Dec 2003
Location: Planet Earth
Posts: 1,677
Likes: 0
Received 0 Likes on 0 Posts
When on the ground and set to AUTO our transponders (Airbus 320 and 330) operate in mode S only and in all modes when in the air. Suspect it's the same for any modern mode S gear.
So from the above information, after landing, all one needs to do is turn TCAS to standby and leave the beacon code in until arrival at gate (Airbus), thanks for the info.
Dream Land is offline  
Old 31st Jan 2008, 06:11
  #9 (permalink)  
 
Join Date: Jun 2000
Location: Here, but soon will be there
Age: 54
Posts: 81
Likes: 0
Received 0 Likes on 0 Posts
Airbus txpndr operation

My understanding is that after landing, you can assign the squawk to whatever you desire, 2000 in your case & turn the TCAS to STBY. When on stand, select the STBY/AUTO/ON selector to STBY as that is the transponder (Mode S) portion of the box.
(If you have the same unit as us, the TCAS selector is on the bottom right & the transponder switch is top left).
kishna is offline  
Old 31st Jan 2008, 08:04
  #10 (permalink)  
PPRuNe supporter
 
Join Date: Dec 2003
Location: Planet Earth
Posts: 1,677
Likes: 0
Received 0 Likes on 0 Posts
Where I operate they want you on your assigned beacon code for the taxi radar, KUL, BKK, HKG.
Dream Land is offline  
Old 31st Jan 2008, 15:24
  #11 (permalink)  
 
Join Date: Feb 2006
Location: EU
Posts: 961
Likes: 0
Received 0 Likes on 0 Posts
keep it on auto, from pushback to arriving to the gate.
dartagnan is offline  
Old 31st Jan 2008, 17:45
  #12 (permalink)  
PPRuNe supporter
 
Join Date: Dec 2003
Location: Planet Earth
Posts: 1,677
Likes: 0
Received 0 Likes on 0 Posts
keep it on auto, from pushback to arriving to the gate
Cheers, D.L.
Dream Land 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.