This document contains Minimum Aviation System Performance Standards (MASPS) for coexistence of Wireless Avionics Intra-Communication (WAIC) systems operating within the 4200-4400 MHz radio frequency band. It provides designers of WAIC systems with guidance on how to demonstrate coexistence of WAIC with other aircraft systems using the same radio frequency spectrum. The MASPS is intended to support the ICAO SARPs for WAIC. Additional requirements in the SARPs have been identified since the initial publication of the MASPS. The technical means of compliance for the new requirements are included in this revision of the MASPS.