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TCAS I BLK NVG DISP 071-01619-0218PS 550 Control Unit | TCASI, Black Faceplate, NVG displayThe PS 550 is a Control Unit for use with the MST 67A Enhanced Mode S Transponder. It contains all controls required for transponder operation including TEST, STANDBY, ON (transponder), ALTITUDE and IDENT.  Th..