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May 1998

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From:
Mike Buetow <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 20 May 1998 16:16:51 -0500
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Ralph,

Thanks for your note. This is a valid question, although I assume that when you say
mil specs "never" changed, it's because the numbers didn't change, not the actual
contents. After all, MIL-PRF-55110 is now at F revision.

I would like to point out that IPC-RB-276 was published in 1992, and not superseded
until 1997, and that IPC-D-275, published in 1991, wasn't superseded until 1998.
That's a lot of time between revisions. In fact, we frequently hear from industry
that the standards don't keep up with the technology.

Although IPC doesn't have the resources at this time to draw up lists showing the
differences between standards, often, larger OEMs prepare such comparisons. In fact,
Boeing prepared a detailed list comparing 276, 55110, and 6012, which it shared with
IPC. When such lists are shared with IPC, we typically make them available to the
industry on a as-requested basis, although we do not double-check for accuracy.

Remember too, that it is the task groups, made up of volunteers from industry, that
write these standards and wrestle with the decisions. IPC is a facilitator and
publisher, but our technical policy is set by a special committee made up of chairmen
of the task groups, and the whole structure operates in (mostly) an autonomous
fashion.

It's a great discussion point. I'm interested in seeing what others have to say.

Mike Buetow
IPC Communications Manager

>>> "Vaughan, Ralph H" <[log in to unmask]> 05/20/98 03:40PM >>>
Greeting,

I will be the first to commend ipc for all the good work that they do
for us, but I gotta say that the practice of obsoleting specs and
replacing with new, renumbered documents is making me long for the old
mil-spec days where specs NEVER changed (I never thought I'd say that).
Not too long ago, after much spec comparison and analysis, we convinced
our government customers that it would be prudent to move from
Mil-P-55110 to the IPC-RB-276.  In the time it took to get the new
drawing callout approved, re-train the pwb designers and revise their
guidelines, and bring our stellar board suppliers up to speed (no small
task),  RB-276 had been superceded by the 6012 document.  Now I just
learn today that IPC-D-275 is superceded by another document.  This
kills efforts to streamline and standardize documentation systems.
Also, when these continuous changes take place, it would be convenient
to have a detailed side paper published explaining all the changes (and
maybe why the changes were made).  May be a lot to ask, but it would
keep every user from doing it individually.

Anyone else see this as a problem?

That's all the whining for now.

Ralph

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