UK Conspicuity Code Change Over
Thread Starter
Join Date: Jul 2002
Location: UK Sometimes
Posts: 1,062
Likes: 0
Received 0 Likes
on
0 Posts
UK Conspicuity Code Change Over
For all you ATC historians out there - when did the UK mode 3/A conspicuity code change from 4321 to 7000? I believe it was c1993 but it would settle an argument if one could be more precise.
TVm
TVm
Last edited by flipster; 28th May 2011 at 15:53.
Join Date: Jan 2008
Location: The foot of Mt. Belzoni.
Posts: 2,001
Likes: 0
Received 0 Likes
on
0 Posts
Not the exact date, but '93 sounds close.
It was about the same time tat Manchester changed from flat-top displays to NODE. I can't recall seeing A7000 on a Plessey display. I bet I still have the SI amendment somewhere upstairs.
It was about the same time tat Manchester changed from flat-top displays to NODE. I can't recall seeing A7000 on a Plessey display. I bet I still have the SI amendment somewhere upstairs.
Join Date: Jul 2005
Location: In the South !
Posts: 196
Likes: 0
Received 0 Likes
on
0 Posts
I get all misty eyed when London allocate a 4321 as an ORCAM squawk! I have got the original drawing that illustrated an article in Flyer magazine. The drawing is of parrots in 'plums' of the colours of the European countries (Squawking 7000 & 7001) and the UK Parrot squawking 4321. Also kept a copy of the original magazine article as well – when I find it (just moved house) I'll post a reply!
Join Date: Jul 2005
Location: In the South !
Posts: 196
Likes: 0
Received 0 Likes
on
0 Posts
I get all misty eyed when London allocate a 4321 as an ORCAM squawk! I have got the original drawing that illustrated an article in Flyer magazine. The drawing is of parrots in 'plums' of the colours of the European countries (Squawking 7000 & 7001) and the UK Parrot squawking 4321. Also kept a copy of the original magazine article as well – when I find it (just moved house) I'll post a reply!
[IMG]
[/IMG][IMG]
[/IMG]The flyer article states the change will occur on the 5th March that year. The accompanying articles states preceding years 1990 & 1991. Therefore I conclude that the change took place on 5 March 1992. This would appear to be supported by the article here : level douglas | twin otter | capt speaking | 1992 | 0270 | Flight Archive which is dated February 1992.
