Hi Joyce, Boy, talk about a grass assumption: >(1) if the assembly is qualified per Mil, why it is fail so early = 1-8 years is relatively short time >consider the designed life is 15 -20 years. What makes you think that being MIL-qualified assures 15-20 years of life? Particularly for an older design? Just because something is good manufactured quality does not make it reliable--for that you need DfR [Design for Reliability]. Werner Engelmaier --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------