Steve:
I can only add a couple of caveats to what has already been stated. Our
facility does everything from building industrial electronics and servovalve
systems as an OEM, steering systems for major launch vehicles, satellite
propulsion systems as well as items to be used on the space station. Our
product lines runs the entire spectrum from J-Std-Class 2 to NASA grade.
First off there is an enormous amount of work that needs to be done behind
the scenes well before you place a component on any board. Please pay
special attention to all of the upscreening aspects for components used in
the hardware. This upscreening effort requires sending parts out for special
burn-in processes, re-identifying the parts, etc etc etc.
The lead times for "S" level components (Typically parts such as: JANS1N5418
diodes) is extreme in some cases, 25 to 40 weeks or more. Radial caps such
as CK05 types with integral standoffs cannot be used because it is not
available in the "S" level packaging. This means that you'll need to use
A-55485/06 class spacers under the parts.
All active parts are serialized !! This means even axial leaded diodes.
Operators tinning parts must remove the SN tag from a diode then replace it
immediately so that traceability is not lost! Tinning slows to a one
component at a time.
All components and materials must meet the outgassing requirements. This
kinda limits your conformal coating choices down to Uralane or Conap
CE-1155. Part substitutions require acts of congress. (Translation, it won't
be allowed)
In a nutshell, do you need to be concerned? You bet, you'll need a dedicated
manufacturing engineering type to follow these 20 pieces that you'll be
building every step of the way. This person cannot be assigned any other
duties. If there is any question about integrity, e.g. getting a serial
number of a component mixed up, the item will be scrapped!!
It's quite a bit more intense than your typical hi-rel stuff. I've been down
the road. I have lots of stories. I could talk for hours. Call me if you
need more info. Good Luck.
Bill Kasprzak
Moog Inc.
716-652-2000 ext 2507
> -----Original Message-----
> From: Stephen R. Gregory [SMTP:[log in to unmask]]
> Sent: Wednesday, July 19, 2000 10:21 AM
> To: [log in to unmask]
> Subject: [TN] Space Electronics...
>
> Hi ya'll!
>
> Here where I work, we do a lot of hi-rel, military stuff. But we've
> recently
> got a bid package of twenty or so assemblies that go into satellites. We
> sat
> down and had a meeting about this business of whether or not we should
> pursue
> it...
>
> I voiced my concerns in that I don't think anybody really has a clue of
> what
> kind of massive undertaking this will be given the way that we do things
> now.
> "But Steve, we build hi-reliabilty assemblies now..." and my reply has
> been;
> "But you ain't seen nothing yet!, the process requirements that must
> followed
> to the letter, and the documentation trail that will go along with each
> and
> every board is going to be massive..."
>
> I don't have any first-hand experience building space hardware, but what
> little I've learned or heard about it, made such an impression on me that
> I
> know that it's not something that I would want to get into...
>
> Those of you that are into this stuff; am I over-reacting or what? Can
> your
> average contract assembly company (that does have experience with military
> electronics) jump into this? Some are poo-poo'ing me saying I'm sweating
> things too much...I don't think I am.
>
> -Steve Gregory-
>
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