I waited a while to see what other responses you would get.  I
        saw one where it was recommended you scrap the board - which,
        depending on its application, is a perfectly reasonable
        response.

        However, when I worked in a military environment, the routine
        was to process the board through an environmental profile that
        included vibration and thermal cycling at accelerated ramp
        rates, over extended times.

        Can't remember what the profile was exactly, but it was the same
        used for routine processing of Class 1 Critical equipment
        (whether it was actually Class 1 Critical or not).

        The first thing was to visually inspect the board for any
        visible damage, rework, test, ESS & Vibe, retest, gain Customer
        concurrence on shipment.

        We didn't bother to submit boards that were "mission critical".
        These were automatic scrap when dropped.  (However, we would
        scrap them to Engineering, Test, or the training department.

        Jan Pelchat


______________________________ Reply Separator _________________________________
Subject: [TN] Dropped boards
Author:  Vernon Presnell <[log in to unmask]> at 0UTG0ING
Date:    7/30/98 9:30 AM


Does any one have any experience with evaluating the reliability of
dropped PWB assemblies?

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