The operatiOn of the Transponder system was.ground and flight checked and all operations were normal. Midcoast Aviation, Inc. D.E.R. approved wiring Aiagram 1159-11000-151 "Transponder Control (CTL-92T" reflects the aircraft.wiring. ' 6.) Removed a Bendix RDR-1200 Radar Systemr, radar indicator, RI' uni