Vernon ; good question if TH ; we saw nothing on 3 year stat charts from field ( may be damaged , but still works ); VERY different on SMD's , we still validate , vibrate , with occasional shocking revelations on what the test finds and what it misses . One classic, Earl mentioned on lucky accident on BGA's knock off on exactly your subject . This is the reason why I sift through web in odd times . Whatever you do , do not buy XRay to find this fractures . You won't . Even live cycling will not discover the extend of stress . Now I have to make another revision in procedures with a carrot & stick behind because it is not quite a human nature to run to Steve reporting his $ 7000 xx layer achievement has been unduly tested just after ICT pass . How do I extend the gospel enforcement from floor (relatively easy) to store (relatively impossible) I hope somebody will tell me . Beats me See you Paul Klasek http://www.resmed.com > ---------- > From: Vernon Presnell[SMTP:[log in to unmask]] > Sent: Friday, 31 July 1998 2:30 > To: [log in to unmask] > Subject: [TN] Dropped boards > > Does any one have any experience with evaluating the reliability of > dropped PWB assemblies? > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV > 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) "On-Line Services" > section for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > ################################################################ > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################