Hello TechNet! I'm looking for guidance, direction, design guidelines or something from IPC regs or FAA regs or mil spec documents that talks about using a printed circuit board to do double duty as a structural member ... in this case, a double sided board with surface mount components (both sides) serving as a cover over other assemblies, horizontally mounted, in a "non environmentally controlled area" ... I think it should be against the rules, but would like to find some direction in writing ... Thanks for any help! Sheila Smith, Tracor AES ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################