Vernon, Per our Reliablity Engineer: A dropped PWB is considered to be unreliable because the g-forces that the PWB saw when it hit the ground cannot be correctly determined. If the g-forces exceeded the maximum allowed for each device any of the following may have occurred: 1) The glass seal at the IC leads could be cracked and there is no test to determine this 2) The lids on ICs may no longer be hermetic and there is no test to determine this 3) Solder joints may be cracked and there is no test to determine this 4) Host of other mechanical failures that cannot be tested for immediately but may result in functional failures later while in flight. A dropped PWB may be used as a test card or slave until it exhibits failures but never in a flight unit. Regards, Michael Hilton Associate Engineer Orbital ################################################################ 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 ################################################################