Description / Abstract: This document contains Minimum Operational Performance Standards (MOPS) for GNSS airborne active antenna equipment designed to use the GPS or Galileo L1 frequency augmented by other systems/equipment/techniques as appropriate to meet the performance requirements for primary means of navigation for en route, terminal, non-precision, and precision approach phases of flight. An active antenna is one integrated with a preamplifier. Minimum requirements for passive designs are specified in DO-228 and DO-228, Change 1. This MOPS specifies an alternative to active antenna requirements specified in DO-228 and DO-228, Change 1