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Thread: Bungee Installation

  1. #181

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    Default Re: Bungee Installation

    I don't remember where I found this. Good info.
    Shock-Cords.pdf
    Last edited by DaleLindstrom; 01-25-2020 at 03:33 PM.

  2. #182

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    Default Re: Bungee Installation

    I was pretty much aware of that, wasn't complaining about the age just giving it as a reference given that Justin got some that were about four years old and was concerned about it a week or two ago...

    Quote Originally Posted by DaleLindstrom View Post
    I don't remember where I found this. Good info.
    Shock-Cords.pdf

  3. #183
    Administrator Steve Pierce's Avatar
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    Default Re: Bungee Installation

    Quote Originally Posted by DaleLindstrom View Post
    I don't remember where I found this. Good info.
    Shock-Cords.pdf
    Good information, learned some new stuff. Thanks.

  4. #184
    Stephen's Avatar
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    Default Re: Bungee Installation

    Quote Originally Posted by doc View Post
    I was pretty much aware of that, wasn't complaining about the age just giving it as a reference given that Justin got some that were about four years old and was concerned about it a week or two ago...
    Yes, good information. But, a 5 year automatic replacement recommendation seems a bit too soon. Of course, replacing if there is wear showing.

    I saved a copy of this information for my files. Thanks
    "You can only tie the record for flying low."

  5. #185

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    Default Re: Bungee Installation

    Quote Originally Posted by ysifly2 View Post
    here's the actual mil-spec that is referenced in the Univair document...Attachment 11761

  6. #186

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    Default Re: Bungee Installation

    I think that mil-spec refers to the manufacture of the shock cords. Once manufactured, they can be stored under proper conditions for a considerable period of time.

  7. #187

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    Default Re: Bungee Installation

    Quote Originally Posted by DaleLindstrom View Post
    I think that mil-spec refers to the manufacture of the shock cords. Once manufactured, they can be stored under proper conditions for a considerable period of time.
    The mil-spec gives the manufacturer 6 month from manufacture to delivery to the end user ( assuming a government contract). If the vendor is advertising shock chords that meet the mil-spec, or if your PO specified they had to meet mil-spec, then anything over 6 months doesn’t meet the contract.


    Sent from my iPad using Tapatalk

  8. #188

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    Default Re: Bungee Installation

    Quote Originally Posted by dgapilot View Post
    The mil-spec gives the manufacturer 6 month from manufacture to delivery to the end user ( assuming a government contract). If the vendor is advertising shock chords that meet the mil-spec, or if your PO specified they had to meet mil-spec, then anything over 6 months doesn’t meet the contract.


    Sent from my iPad using Tapatalk
    I read it that the rubber used in the manufacture of the cords could not be more than six months old.
    I understood it to be a manufacturing mil-spec.

  9. #189
    smcnutt's Avatar
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    Default Re: Bungee Installation

    The date issue is pretty confusing since later in the Univair document above it states:

    There is no specified shelf life. SBC sent us correspondence in 2000 stating:
    There is no prescribed limit on shelf life. As long as the Superior Rings
    are kept in a controlled environment with low relative humidity and out
    of UV light, they should keep for periods longer than we could
    reasonably record data. An excessively dry condition of storage can
    eventually cause dry-rot of the rubber core. Conversely, an excessively
    damp condition can cause rot of the cover material. We have had rings
    in the field in place on an aircraft last greater than 20 years. It is
    therefore reasonable to assume that non-extreme conditions in a
    warehouse should yield a shelf life more than sufficient to inventory our
    product until resale.

    Advisory Circular, AC 43.13-1B, 9-4 (a) states:
    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.

    Kind of makes you wonder why they require the date code woven into the ring if the Mfg date is unimportant -since it doesn't have a shelf life. Even then, at 5 years (installed) it is only then "Advisable" to replace, not required, and that would be based on install date and not the original Mfg date.

    Replace when they wear out and/or sag. The color code is useless.
    “Seek advice but use your own common sense.”
    ― Yiddish Proverb

  10. #190
    McDaver63's Avatar
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    Default Re: Bungee Installation

    Has anybody used or anyone know if you can use a bungee tool like this for installing bungees on a hydrasorb type shock for a PA-22? https://secure.steenaero.com/Store/s...DF2A6172891E71
    I fly because it releases my mind from the tyranny of petty things

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