Blue - Green - Yellow
 

Just lifted this from the ATSB report on the A380 uncontained engine failure.
As a Concorde ancient, to me the primary hydraulic (and flight control) systems are called BLUE and GREEN, and YELLOW is the 'fall-back'.

When did this 'convention' change ?

"Confused"

It has been almost ten years since my Airbus time but I recall that on the A-320 series as well as the A-330 & A-340 the Green was the heavyweight and the Blue & Yellow were pretty much equals, splitting various services. One could start quite a discussion about which of those two was the more important but in the end they were about equally loaded but definitely came after the Green one.

On A300 it's

- Green
- Yellow
- Blue

Who cares what they are named?

They are colours in the magnificent Airbuses and A and B in my old 727. PC1; PC2 and Utility in my F4, if I recall correctly.

Who ever called Concorde conventional?

G'day ;)

Green and Yellow are L and R on the A320 layout.

Green and Yellow are L and R on the A380 layout. No blue system fitted.

A320 has been around for well over 20 years now so I guess that answers the original question.

Did the colour system start on the Caravelle??

...it was already on the CARAVELLE....don't know before this ship


anybody knows, seriously please, why its green yellow blue and not e.g. red black white for example :8

Colour Codes
 

Same reason that electrical wire are coloured. Instead of labels you have colours.

You can also make the fluids coloured with dyes so if there is a leak you can tell which system is leaking.

Also because all systems are not the same in other words to stop service people connecting the wrong tubes together.. Yup really is that simple.

If I am not mistaken I think A388 only has two systems, not sure though.

'twas on the Comet green,blue,yellow and red.

One was in deep do do if all you had was red !

When a colleague of mine was told after he had stuffed a Comet through the Hangar doors at Heathrow "why didn`t you have the Red pump on??!!!

It was a standing joke at the Best Ever Airline which he never lived down!!!

tristar 500

(Sorry for thread drift)

If it were the electronic component color code, the game would be:

0 Black
1 Brown
2 Red
3 Orange
4 Yellow
5 Green
6 Blue
7 Violet
8 Grey
9 White

(Electron-heads know the mnemonic for this...)

Fargoo
What about the Blue system that seems to be the emergency bring back system?
http://pmgasser.ch/airbus_memos/downloads/A320_HYD.pdf
No engine driven pump, but if you lost Green and Yellow, you would definitely want it.

Yeah....It'd get us all banned if we posted it up mind :{

Didn't the Carvelle use Comet systems (and nose)? We have a Nimrod MR2 at Manchester and that has green,blue,yellow and red systems, being basically a Comet 4!

I understand Concorde was to have these 4 systems as well, but the Red system was deleted early on.

How do they change the colour of so much skydrol? :E:E
food colouring? System A and system B seems much more conventional.

You're right about the nose....
Sud bought a Comet nose for the prototype, and manufactured the others under licence.
I wouldn't know about the systems... they weren't that far behind!

LOL.... blue, green and yellow were just the designations and colour codes for the systems.... as on the hydraulic selection panel top left on this photo of the overhead panels (courtesy of CONCORDE SST - The Definitive Concorde Aircraft Site on the Internet).

http://www.concordesst.com/inside/co...s/overhead.jpg

The hydraulic liquid itself wasn't coloured (what for?).

And BTW, Concorde didn't use skydrol, but a special heat-resistant hydraulic fluid, known either as "Oronite" or "M2V".

CJ

I get on dangerous ground here as it's 38 years ago and I never had a formal course, at that time one was purely a radio engineer and with the comet in full time employment doing just that, however IIRC, red on the comet was just brakes and u/c uplocks. I think, if you had the remainder of your life, flaps. there might have been some flying controls as well as I don't recall much manual reversion.
I don't know if the nose on the caravelle is an urban myth or not but from brief encounters there were many similarities, Avons, 120vdc starters, coloured hydraulic systems etc.

No, it's true.
Where I'm not sure, is whether Sud then has bought other nose assemblies from DH or manufactured them all themselves under licence.

Thanks, that answers my question about systems....

CJ

As for the "colours" yellow mixed with blue = green. Just a bit of logic that airbus has used since the classic a-300. Green had pumps on both engines yellow and blue were independantly driven and had PTU drove off the green system. All primary flight controlls were powered by all 3 systems then secondaries, gear, brakes and steering divied up what was left.