I have to agree with your customer. If you change std based on material
change, e.g. FR4 vs polyimide, you might causing more of problem due to
extreme temp or dielectric issues. Some of them of old spec required
thermal shock PWB qualification, but not the new one. As for 2000C, the
solder joints acceptance criteria are different based on my knowledge
(hole fill, shinny joints etc.etc.). It may got something to do with
reliability. When you send something out of space, you possibly only
got one shot deal. If the project engineer does not feel comfortable
with the change and he is the one put his neck on the line, you should
respect his opinion (unless you are the project engineer and sign on the
dotted line and take full responsibility for what ever the mission).
NASA usually is very good. They must have some good reason not accept
the change.
My 2 cents.
jk
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Kasprzak,
>Bill (sys) USX
>Sent: Monday, August 25, 2003 2:46 PM
>To: [log in to unmask]
>Subject: Re: [TN] Mil-P-55110 versus MIL-PRF-31032
>
>
>Blair,
>
>I wish that what you stated was true for aerospace. I have a
>customer that insists on Mil-Std-2000C and other old specs.
>Despite my best efforts to indicate that we should not build
>product to a cancelled specification, the customer refuses to
>change the contract language.
>
>Apparently, you know of some clause where it is my option to
>make this call.
>
>
>So, have you had success with a customer who says build it to
>"X" where you come back and say, "No, we're going to build it to 'Y'"?
>
>Just curious,
>
>Bill Kasprzak
>Moog Inc.
>Electronic Process Engineering
>
>
>-----Original Message-----
>From: Blair K. Hogg [mailto:[log in to unmask]]
>Sent: Monday, August 25, 2003 10:49 AM
>To: [log in to unmask]
>Subject: Re: [TN] Mil-P-55110 versus MIL-PRF-31032
>
>
>Daan,
>
>If I remember correctly from my days in Aerospace it is
>perfectly acceptable for a company to migrate to a new
>standard when an old standard is superseded. It is entirely
>the option of the organization to determine which version of
>the standard to use - the one called for in the contract or
>the latest version or superseded standard.
>
>However, if you are going to do this, I would recommend that
>you let your customers know this when they place an order with
>the old standard called out.
>
>Blair Hogg
>QA Manager
>GAI-Tronics Corp.
>
>
>>>> [log in to unmask] 08/25/03 10:21AM >>>
>Hi Technet,
>
>Mil-P-55110D is not active anymore, and has been replaced by
>MIL-PRF-31032. If the production-drawing states "PCB shall be
>produced according to to MIL-P-55110D" does it mean that the
>board manufacturer has the freedom to use the replacement
>specification ? The specific issue is that Mil-P-55110 D does
>not allow exposed fibers, whereas Mil-PRF-31032 does allow
>this (with some restrictions of course), but I assume there
>are more diffferences between these two specs.
>
>Best regards,
>
>Daan Terstegge
>
>
>
>
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