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Home > Forums > Eng-Tips Groups > Eng-Tips Groups > Engineering Language/Grammar Skills Forum

part numbering in component maintenance manuals according to ATA

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Kirsten (Aerospace)

12 Jul 12 14:05

The Air Transport Association rule says the following:

"Blank spaces and special characters, with the exception of the dash (-), are not permitted in part-number structures. The dash (-) is permitted only between numeric characters (Ref.[ATA SPEC 200] or/or ATA SPEC 2000])."

For example, the part number for a MS24693-C51 screw would be converted to MS24693CC51. But why? I asked our tech. writers, who replied "Because that's the rule." Does anyone know the answer?

KENAT (Mechanical)

12 Jul 12 14:10

May be derived from ASME/ANSI/DOD part numbering schemes which use '-' numbers to differentiate different parts defined on the same drawing.

Posting guidelines FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm? (probably not aimed specifically at you)
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?

rb1957 (Aerospace)

12 Jul 12 14:15

that may be the rule, but then it looks (IMHO) that the rule is an "ass". the "-" has meaning in the bolt part number (i assume the double C is a mistype, that the dash would be removed only ?). I can see that the "-" has special meaning in aircraft part definition (ie as an extension of the drawing number), but it seems ridiculous (again, IMHO) to apply this rule to vendor items (like screws).

but then, if people asked my opinion, and acted on it, i'd probably find the world a much more logical place.

Kirsten (Aerospace)

13 Jul 12 8:55

Oops! Thank you, the double C is indeed a mistype.

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