Bungee Life

[pftcraft]

Re: Bungee Life

The same idea is used on humans ... you know ..for those little pollops and internal things...

Ok ok someone change the subject !

[Bojambles]

Re: Bungee Life

I can not address the current situation with bungee cord availability and quality, but I have always subscribed to a five year maximum life limit for my cords, and have generally been successful in acheiving that life limit.

I use the criteria outlined in AC43.13-1B Chapter 9 page 9-2:

a. Old aircraft landing gear that employs a rubber shock (bungee) cord for shock absorption must be inspected for age, fraying of the braided sheath, narrowing (necking) of the cord, and wear at points of contact with the
structure and stretch. If the age of the shock cord is near 5 years or more, it is advisable to replace it with a new cord. A cord that shows other defects should be replaced, regardless of age.

b. The cord is color-coded to indicate when it was manufactured and to determine the life of the shock cord. According to MIL-C-5651A, the color code for the year of manufacture is repeated in cycles of 5 years. Table 9-1 shows the color of the code thread for each year and quarter year.

TABLE 9-1. Bungee cord color codes.

YEARS ENDING COLOR QUARTER COLOR
WITH

0 or 5 Black 1st Red
1 or 6 Green 2nd Blue
2 or 7 Red 3rd Green
3 or 8 Blue 4th Yellow
4 or 9 Yellow 1st Red

c. The color coding is composed of threads interwoven in the cotton sheath that holds the strands of rubber cord together. Two spiral threads are used for the year coding and one thread is used for the quarter of the year
sheath, e.g. yellow and blue would indicate that the cord was manufactured in 1994 during April, May, or June.


http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/99c827db9baac81b86256b4500596c4e/$FILE/Chapter%2009-10.pdf