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TCAS II GRAY NVG DISP O/O 071-01619-0223PS 550 Control Unit | TCASII, Gray Faceplate, NVG Display, ON/OFFThe 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 ..