RWY INCURSION BY A TAXIING HAWKER CPR JET WAS A LEVEL OF CONCERN BY THE PLT OF AN MU2 CARGO FLT LNDG AT CPS; IL.

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ON THE MORNING OF JUN/TUE/02 AT APPROX XA40; I WAS VECTORED BY ST LOUIS APCH CTL 123.7 STL TO CPS ARPT. WITH NO RPTED TFC IN THE AREA; I CANCELED MY INST FLT PLAN WITH STL APCH ONCE I IDENTED CPS; AND CHANGED TO ADVISORY FREQ 120.9 CTAF; WHICH BECOMES THE TWR FREQ AT XB00. ON CTAF; I RPTED A 3 MI BASE LEG TO RWY 30L; 1 MI BASE LEG TO RWY 30L; BASE TO FINAL RWY 30L; AND LNDG RWY 30L. AS I TOUCHED DOWN ON RWY 30L AT APPROX XA45; AND PULLED THE PWR LEVERS INTO BETA RANGE; A HAWKER PARTIALLY PULLED OUT ONTO RWY 12R FROM TXWY D. I INITIATED MAX REVERSE AND MAX BREAKING AND TURNED OFF THE RWY ONTO TXWY K; WHILE THE HAWKER PULLED COMPLETELY ONTO RWY 12R FACING ME. THE HAWKER WAS NOT MONITORING CTAF; AND THE HAWKER HAD NO LNDG LIGHTS; OR STROBE LIGHTS ON. AFTER LNDG; I TAXIED TO PARKING; AND TENDERED MY CARGO TO THE COURIER. THE HAWKER REMAINED PARKED ON THE DEP END OF RWY 12R WITH NO LIGHTS ON FOR 15 MINS; AND DEPARTED AT XB00. ONCE THE CPS TWR OPENED; I CONTACTED THE TWR ON 120.9 TO GET A RADIO CHK; TO INSURE MY RADIOS WERE WORKING. ONCE THE RADIO CHK WAS SATISFACTORY; I ASKED THE TWR PERSONNEL IF THEY HAD SEEN WHAT HAD TRANSPIRED; AND THEY HAD. I ASKED WHY THE CREW OF THE HAWKER WAS NOT MONITORING CTAF; AND THE TWR PERSONNEL CALLED STL TO FIND OUT. THE CPS TWR PERSONNEL SAID THAT THE HAWKER CREW WAS MONITORING AND IN CONTACT WITH STL CLRNC DELIVERY ON 121.8; CPS GND CTL FREQ DURING NORMAL HRS OF OP. THIS RWY INCURSION COULD HAVE BEEN PREVENTED BY THE PROPER USE OF MONITORING AND ACFT POS RPTS ON CTAF BY THE HAWKER CREW. ADDITIONALLY; THE HAWKER SHOULD NOT HAVE REMAINED PARKED ON AN ACTIVE RWY FOR 15 MINS. HAD I NOT CANCELED MY INST FLT PLAN UNTIL ON THE GND; THIS INCURSION MAY HAVE BEEN PREVENTED; IF THE HAWKER CREW WAS MONITORING STL APCH CTL ON 123.7. IF THE HAWKER CREW MONITORED STL APCH CTL; THEY WOULD HAVE KNOWN THAT I WAS CLRED FOR A VISUAL APCH TO CPS RWY 30L.