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Description / Abstract: This document presents a consolidation of performance requirements from two sources: RTCA /DO-144 dated March 12, 1970 and Change 1 to DO-144, posted as RTCA Paper No. 232-70/EC-643, dated November 5, 1970; and the performance standards referred to in paragraph (a)(1) of Federal Aviation Administration (FAA) Technical Standard Order (TSO)-C47c, dated February 20, 1973. The document includes the technical changes/advances necessary to ensure proper operation with Mode S and TCAS interrogators. The document is a coordinated effort with EUROCAE WG-49.