This document provides the final planned version of the VDL Mode 2 and Mode 3 MASPS consolidated from previous documents. It is synchronized with ICAO SARPS and Technical Manuals for VDL Modes 2 and 3. Future updates to DO-281A, MOPS for VDL Mode 2, and DO-271C, MOPS for VDL Mode 3, will be synchronized with DO-224C.

DO-224C provides VDL Mode 2 refinements for operating/system parameters, technical descriptions and other considerations to be taken into account when determining compliance. The key improvements include separating frequency selection list (FSL) into airborne-FSL and ground-FSL, refining FSL-based handoff procedures, introducing "ground" bit usage in the Aviation VHF Link Control (AVLC) specific options parameter, refining frequency recovery and missing parameter handling. No refinements were made to VDL Mode 3.