Covers qualification and performance requirements for flexible printed boards designed to IPC-2221 and IPC-2223. The flexible printed board may be single-sided, double-sided, multilayer or rigid-flex multilayer. All of these constructions may include stiffeners, plated-through holes and blind/buried vias. Revision A with Amendent 2 incorporates updated requirements for surface plating, microsection evaluations and acceptance testing frequency. Supersedes IPC-6013A with Amendment 1. For use with IPC-6011.