Doug.. I am not very familiar with all the different specs out there in the world, but I have worked with the Mil specs and I am getting to use the IPC specs. Here is what I beleive to be published. Mil-Std-275 and Mil-C-28809 both reference jumpers (designed-in-jumpers and repair/ modification jumpers). IPC-D-275 and IPC-2221 (soon to replace 275) references only designed-in-jumpers. I do not know if the IPC has a repair/modification spec, maybe a Mike Buetow/Dave Bergman or someone else at the IPC could comment. Here is what we do on our Military products for changes/repairs/ modifications to multilayer pwb surfaces/assemblies: We add 36 awg magnet wire, typical for standard 5v digital designs, and isolate by cutting or isolating component leads per the Mil specs. If we reach a specified number of jumpers, again per the Mil specs, we are contractually obligated to redesign the surface and incorporate all outstanding changes/mods/repairs into the new design. Hope this helps. If you would like, feel free to contact me for further questions/comments. Have a good day. Regards, Bob Vanech *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************