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chopper12
07-07-2011, 11:26 PM
Hi
I got a dozen spare shock cords with a plane I bought, 4 of them have tags on them 1280 HD but the others don't ,but I noticed that they have 3 coloured bars on them
1280 HD 2 black lines 1 blue line
?? 2 black '' 1 red "
?? 2 tellow " 1blue "
?? 3 green lines
anyone have an idea on the size of the other ones based on the colour lines?

THANKS

P.o.P.
07-08-2011, 12:17 AM
The colors are the date of manufacture.

I have no idea of how the code works.

If you can't determine when they were made it is a waste of time to install them.

One time I put nice "new -looking" shock cords on a Pawnee.

Lasted exactly 1 (one ) day.

They were actually someone's old stock.

59pacer
07-08-2011, 06:14 AM
The color code works on a 5 year cycle, and is to do with when they were manufactured, not what their p/n is.
2 blacks indicate a year ending with 0 nor 5
2 greens indicate a year ending with 1 or 6
2 yellows indicate a year ending with 4 or 9
the other color indicates the quarter of the year:
red/blue/green/yellow indicate 1st/2nd/3rd/4th quarter.
2 black/1 red would mean they were made in the first quarter of 2010,2005,2000,1995,1990,1985,1980 etc etc
As you can see, there is no way of knowing actually how old they are!! If they are no good, they sag really quickly!

chopper12
07-08-2011, 09:45 AM
THANKS for the quick reply!!

P.o.P.
07-08-2011, 10:48 AM
So we can tell the "quarter" but NOT the CENTURY!

Glen Geller
01-03-2013, 03:51 PM
UPDATE: The question of shock ring (bungee) color code came up in conversation today, thought I would share what I found.

http://www.sbcindustries.com/products.htm

GG

DaveH
07-08-2014, 07:04 PM
Thanks Glen. Just what I wanted to know. That fills in the missing years from 59pacer's reply above. 2 or 7 (red) and 3 or 8 (blue). Now to measure the diameter to see if the engineer fitted the right ones!
Dave.