C500 IS VECTORED OFF JEF RWY 30 FINAL APCH COURSE INSIDE LOM WHEN OPPOSITE DIRECTION TFC BECOMES AIRBORNE.

Narrative

WE WERE DSNDING INTO JEF IN IMC AND IN CONTACT WITH MIZZU APCH. MIZZU HAD VECTORED US FOR AN ILS RWY 30 APCH FROM THE NE. WE HAD INTERCEPTED THE LOC AND GS AND WERE CLRED FOR THE APCH. WE HAD JUST PASSED ALGOA LOM DSNDING ON LOC AND ON GS AND WE HAD NOT YET BEEN HANDED OFF TO JEF TWR. I WAS ABOUT TO ASK MIZZU FOR THE HDOF WHEN MIZZU CALLED US AND SAID SOMETHING TO THE EFFECT OF 'CANCEL YOUR APCH CLRNC; YOU HAVE OPPOSITE DIRECTION TFC OFF OF JEF; TURN R HDG 360 DEGS; CLB AND MAINTAIN 3000 FT. THERE DIDN'T SEEM TO BE ANY URGENCY IN HIS VOICE. I IMMEDIATELY LOOKED AT OUR TCASII DISPLAY AND SAW THIS TARGET INITIALLY AT 800 FT BELOW US AND APPROX 2 1/2 MI AT 12 O'CLOCK POS AND CLBING RAPIDLY (IT WAS ALSO A JET). I IMMEDIATELY TOLD THE PF TO TURN HARD R; AND HE DID. HIS TCASII TARGET PASSED OURS AT 9 O'CLOCK POS; 0 FT VERT CLRNC AND WHAT I ESTIMATED TO BE LESS THAN 1 MI -- POSSIBLE 1/2 MI AND HORIZ CLRNC. BEING IN IMC; WE NEVER ESTABLISHED VISUAL CONTACT WITH THE OTHER ACFT. WE WERE THEN REVECTORED FOR THE APCH AND LANDED WITHOUT INCIDENT. WE CALLED THE TWR AT JEF ON THE LANDLINE TO DISCUSS THE INCIDENT. (JEF TWR IS NON RADAR.) HE DIDN'T KNOW THE INCIDENT HAD HAPPENED! WE CALLED MIZZU APCH ON THE LANDLINE AND THEY INFORMED US THAT THEY HAD ALREADY BEGUN AN INVESTIGATION OF THE INCIDENT. THEY SAID THAT THE PERSON WORKING MIZZU APCH RADAR HAD MADE A MISTAKE. WHEN THE JEF TWR CTLR CALLED TO REQUEST THE RELEASE FOR THE JET DEP RWY 12; THE RADAR CTLR 'EXPECTED' TO HEAR THE REQUEST FROM RWY 30; NOT RWY 12; AND HE HEARD WHAT HE EXPECTED TO HEAR -- NOT WHAT WAS REALLY SAID. THE APCH CTLR BECAME AWARE OF THE CONFLICT ONLY BECAUSE AS WE APCHED THE LOM; HE HAD NOT YET SEEN THE DEPARTING ACFT ON HIS SCREEN SO HE CALLED THE TWR CTLR AND ASKED FOR THE POS OF THE DEPARTING ACFT. THE TWR CTLR SAID THAT THE ACFT WAS JUST LIFTING OFF OF RWY 12. THE RADAR CTLR TOLD THE TWR TO ISSUE A R TURN TO THE DEPARTING ACFT AND THEN CALLED US. WE WERE ALREADY INSIDE THE MARKER AT BTWN 1200 FT AND 1000 FT AGL (WHICH PREVENTS OUR TCASII FROM ISSUING ANY RA'S OR AUDIBLE WARNINGS OF ANY KIND) AND OUR CLOSURE RATE WAS RAPIDLY APCHING 350+ KTS. OBVIOUS PROB IS THAT JEF TWR DOES NOT HAVE RADAR. IF TWR HAD RADAR; HE WOULD HAVE KNOWN OUR POS LONG BEFORE THIS HAPPENED. I BELIEVE HIS COMMAND TO US COULD HAVE BEEN MORE URGENT. WE LEARNED THAT WHEN SHOOTING AN APCH IN IMC TO AN ARPT THAT IS EITHER A NON RADAR TWR FIELD OR AN UNCTLED FIELD; THAT WE SHOULD INCLUDE IN OUR SCAN THE TCASII DISPLAY; SINCE IT MAY NOT ANNOUNCE THE PRESENCE OF TFC IN THIS PHASE OF FLT. ALSO; I WOULD STRONGLY RECOMMEND THAT THE FAA INSTALL RADAR AT ALL TWRS!