Definition

MIL-PRF-55110 is the legacy specification (predecessor to MIL-PRF-31032) for rigid single-sided, double-sided, and multilayer printed wiring boards for military applications. Still required for legacy military programs where original specifications call out 55110. New designs should use MIL-PRF-31032. If you're supporting existing military equipment, check whether the original drawings specify 55110 or 31032.