The corner crack data is very well depicted in IPC-RB-276 Figure 7 and Table 10 and is perhaps clearer than the examples shown in IPC-A-600. As RB-276 is the document from which IPC-A-600 takes its info, it should be used to as the controlling document. The answer to your question is that B cracks cannot extend into the plating for Class 2 and 3 Phil Hinton hintpwb1 @aol.com *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************