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Directory Results for AC 20-131A - Airworthiness Approval of Traffic Alert and Collision Avoidance Systems (TCAS II) and Mode S Transponders. Airworthiness Approval of Traffic Alert and Collision Avoidance Systems (TCAS II) and Mode S Transponders to AC 20-141B - Airworthiness and Operational Approval of Digital Flight Data Recorder Systems. Airworthiness and Operational Approval of Digital Flight Data Recorder Systems