Aluminium Specifications

Discussion in 'Technical Requests' started by Stressmerchant, Jun 4, 2008.

  1. Stressmerchant

    Stressmerchant New Member

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    Hi all, first time poster. Apologies if this topic is a repeat.

    I do a lot of work with DC-3 / C47 aircraft. The Structural Repair Manual (SRM) and manufacturing drawings specify alumimium (or aluminum for my American friends ;) ) grades such as 24ST. The modern equivalent of 24 is 2024, with the ST being replaced with a suffix such as -T3 or -T4.

    I have my own informal table of equivalents, drawn up by comparison with properties. However, at some stage there must have been a technical document advising users of the equivalence between the specification nomenclatures. Does anyone know of such a document, probably a TO or something similar?
     
  2. FLYBOYJ

    FLYBOYJ "THE GREAT GAZOO"
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    Advisory Circular AC.43.13 and the "Standard Aircraft Handbook." I think both books provide equivalents between the old designators, it is pretty straight forward. What exactly are you looking for?
     
  3. Stressmerchant

    Stressmerchant New Member

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    Must have the wrong editions of those references, I don't see any comparison table.

    As an example, what are the official modern equivalents for "24ST, Bar, to 4 in, cross gr" and "24ST Extruded shapes"?
     
  4. FLYBOYJ

    FLYBOYJ "THE GREAT GAZOO"
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    24ST should be 2024 - as far as the temper (T3, T4) will depend on useage. Does this help?

    Aluminum Tempers - Engineers Edge

    Also see the attached document.

    Hope this helps.
     

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  5. Stressmerchant

    Stressmerchant New Member

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    Thanks for that. I use the Mil-Hdbk 5 or MMPDS to compare figures, but it occurs to be that at some point the US military would have issued a TO or similar document advising technical personnel of the equivalents between the different grades and treatments.

    I guess they just handled it the same way we are doing now ;)
     
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