×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Change Classifications

Change Classifications

Change Classifications

(OP)
Can someone please explain Class 1 and 2 changes for drawings?

Thanks!

RE: Change Classifications

Class I (Non-interchangeable Change)-
Items in this category will not physically or functionally meet product specifications as a direct replacement item for all applicable applications using the previous revision.  Items in this category require new part numbers to be assigned.

Class II (Interchangeable Change)-
Items in this category retain the physical and functional product specifications to act as direct replacement items for all applicable applications using the previous revision.

"Art without engineering is dreaming; Engineering without art is calculating."

Have you read FAQ731-376: Eng-Tips.com Forum Policies to make the best use of Eng-Tips Forums?

RE: Change Classifications

Is this an ANSI definition (or some other non-private standard)?

RE: Change Classifications

Isn't it something like MIL-T-31000, I tried to find it in the ASME specs a while ago and had trouble, I'd appreciated if anyone can give the ref.

One thing that occasionally gets missed on Class 1 is that the changes must be both forward and backward compatible.  i.e. not only must the new rev replace the old but if necessary the old rev can replace the new.

RE: Change Classifications

Sorry, I should have noted it was non-standard, but based on a standard.  I'm trying to find the mother document.

"Art without engineering is dreaming; Engineering without art is calculating."

Have you read FAQ731-376: Eng-Tips.com Forum Policies to make the best use of Eng-Tips Forums?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources